Re: WANTED: iSBC-202 microcode image

2019-11-13 Thread dwight via cctalk
The 3000 parts were bit slice processors. There were only a few instructions involved in there execution. Much of the action was on in the code as you'd think of a typical uP. In other words, there were not specific I/O instructions causing various actions. In may cases, just having the

Re: 50 yrs. ago today

2019-10-29 Thread dwight via cctalk
Until recently, a computer was a person that did calculations. I suspect that if they we smart enough to do the calculations they were smart enough to talk to each other. Dwight From: cctalk on behalf of ED SHARPE via cctalk Sent: Tuesday, October 29, 2019

Re: plated wire memory

2019-10-21 Thread dwight via cctalk
It can't be all that bad if it has been flying in space for all these year without crashing the processors. The CMOS processor has lost several CMOS memory bits but the main control processor is still chugging away on its original wire memory. There are a lot of factors in the entire system.

Re: plated wire memory

2019-10-21 Thread dwight via cctalk
surface with current day processing. Dwight From: cctalk on behalf of Chuck Guzis via cctalk Sent: Sunday, October 20, 2019 2:23 PM To: dwight via cctalk Subject: Re: plated wire memory On 10/20/19 1:50 PM, dwight via cctalk wrote: > It is funny that the most com

Re: plated wire memory

2019-10-20 Thread dwight via cctalk
It is funny that the most common memory used today is a DRO type memory. The read destroys much of the charge on a DRAM cell, requiring a write back of the data. Dwight From: cctalk on behalf of Jon Elson via cctalk Sent: Sunday, October 20, 2019 10:22 AM To:

plated wire memory

2019-10-20 Thread dwight via cctalk
I was just listening to a video on the Voyager space craft. It used an interesting type of memory, called magnetic wire memory. There is only a little bit of information of it on the web. It is clever in that has a non-destructive read. I just wondered if any one else was familiar with this

Re: General Automation SPC 16 on eBay

2019-10-12 Thread dwight via cctalk
Wow, Look at all the drives. It looks like it even has a Diablo hard drive. I don't know what the drives that are below the 5.25 drives are?? Dwight From: cctalk on behalf of Bob Rosenbloom via cctalk Sent: Saturday, October 12, 2019 9:28 AM To:

Re: Mystery chip SCM44506L

2019-10-10 Thread dwight via cctalk
That would make sense if these were OTP or fused parts. Wouter, can you check the pins with an ohm meter, to what we think are power and ground. Outputs usually look different than inputs. Dwight From: cctalk on behalf of Brent Hilpert via cctalk Sent:

Re: Mystery chip SCM44506L

2019-10-10 Thread dwight via cctalk
Maybe they are OTP? Dwight From: cctech on behalf of Wouter de Waal via cctech Sent: Thursday, October 10, 2019 5:33 AM To: cct...@classiccmp.org Subject: Re: Mystery chip SCM44506L > >Very likely a semi custom or custom memory device, due to the prefix.

Re: Tek 500 pulser modules

2019-10-01 Thread dwight via cctalk
on behalf of dwight via cctalk Sent: Tuesday, October 1, 2019 9:33 AM To: Jon Elson ; General Discussion: On-Topic and Off-Topic Posts Subject: Re: Tek 500 pulser modules Hi I thought I'd mention that when troubleshooting a computer, if you can't takeover the execution of the processor

Re: Tek 500 pulser modules

2019-10-01 Thread dwight via cctalk
Hi I thought I'd mention that when troubleshooting a computer, if you can't takeover the execution of the processor, such as a diagnostic ROM, a pulse generator can be a useful tool. For most all TTL, except some bus drivers, one can use a pulse generator to override a 1 value to inject a

Re: IBM 5110 transformer?

2019-09-30 Thread dwight via cctalk
Is it a switcher or an AC? A custom transformer is going to be quite expensive. About the only way is to cannibalize another machine. Dwight From: cctalk on behalf of Mattis Lind via cctalk Sent: Sunday, September 29, 2019 11:44 PM To: General Discussion:

Re: analog computer - texas

2019-09-19 Thread dwight via cctalk
Wow Dwight From: cctech on behalf of Dave Wade via cctech Sent: Thursday, September 19, 2019 12:25 AM To: 'General Discussion: On-Topic Posts' Subject: analog computer - texas Seen on the vintage forums - I hope I am not spoiling some ones bid

Re: [Simh] Fwd: VAX + Spectre

2019-09-17 Thread dwight via cctalk
The main difference between Meltdown and the various Spectre problems was that Meltdown didn't require you to find code that runs in protected space to cause the sideband effects. Spectre required knowing about specific code running in protected mode to do the dirty work for you. You just pass

Re: So what the heck did I just pick up?

2019-08-31 Thread dwight via cctalk
How about some pictures of what was inside. A picture that is atleast good enough to see what is there. Dwight From: cctalk on behalf of Brent Hilpert via cctalk Sent: Saturday, August 31, 2019 1:25 PM To: General Discussion: On-Topic and Off-Topic Posts

Re: So what the heck did I just pick up?

2019-08-31 Thread dwight via cctalk
One wonders what the micro instructions were? It looks like a lot of circuit tracing ahead. Dwight From: cctech on behalf of Chuck Guzis via cctech Sent: Friday, August 30, 2019 7:57 PM To: John Ames via cctech Subject: Re: So what the heck did I just pick

Re: Decaying foam on PCBs

2019-08-28 Thread dwight via cctalk
I'm with Chuck on this one, I've use 91% on the foam gunk and it has worked. A similar product in the US is called GooGone. It can remove stenciled part labels and attacks some plastic. Dwight From: cctalk on behalf of Jules Richardson via cctalk Sent:

Re: TRS-80 Fireworks

2019-08-28 Thread dwight via cctalk
It was at the Maker Faire, 1 year ago, we had these caps blow on 2 Apple II's. One ran for less than an hour before going and the other ran for a day and the next day it also blew ( it was my Apple II ). It now lives without the capacitor. Dwight From: cctalk

Re: bit-slice and microcode discussion list

2019-08-23 Thread dwight via cctalk
The concepts of bitslice coding and optimizing of it have always interested me. I'm not sure about the correlation to "CISC to VLIW RISC". Dwight From: cctalk on behalf of Al Kossow via cctalk Sent: Friday, August 23, 2019 2:37 PM To: cctalk@classiccmp.org

Re: Archiving information, was Re: ADM-3A question

2019-08-16 Thread dwight via cctalk
One of the problems with archiving is what to do with items that are not popular. Some things might be more valued ten or twenty years in the future but not now. Is the fact that the item has relatively low interest now a possible reason to not archive it in a searchable form for future

Re: GW-DEC-1: A New DEC Prototyping Board

2019-08-16 Thread dwight via cctalk
I was wondering, does anyone check the thickness of the gold plating anymore. Years ago, working at another large company, we saw quite a bit of cheating on this. Trust but verity. Dwight From: cctalk on behalf of Dennis Boone via cctalk Sent: Friday, August

Re: Raspberry Pi write cycles

2019-08-14 Thread dwight via cctalk
Some of the newer larger SD cards use a different write voltage than 3.3V. There is a ways of asking the card what voltage it likes during the init. Using the full 3.3V on these parts can damage them. They are all required to init with 3.3V but the voltage for writing may be different. I've only

Re: Resurrecting integrated circuits by cooking them.

2019-07-25 Thread dwight via cctalk
Hi Sam On one of the projects I worked on, we had a lockup problem ( CMOS issue ). It would blow either the VCC or GND lead. We had a wire bonder in the lab. I'd remove the cap from ceramic chips and bond on a new wire. It would work fine until we sequence the power wrong and it would blow

Re: Resurrecting integrated circuits by cooking them.

2019-07-24 Thread dwight via cctalk
Failure of the POKEY chip were likely bonding wire failures. Voltage stress failures are not likely to self repair. I would agree, the fix is likely temporary. Many early chips used gold wire for bonding but later chips used aluminum. Which is better is always a question. The pads on the die

Re: Box of HP 1000 series MUX cards - 12040

2019-07-14 Thread dwight via cctalk
I'm curious. I'm not a HP fan but I do have a 21MX in my collection. I've run it enough to see that the front panel is working with some RAM. My question is, why would anyone use a MUX card ( in other words what are they used for )? The next question is even for someone that had a use for some,

Re: Lots of Apple 1 computers @ VCF West

2019-07-08 Thread dwight via cctalk
Yes Evan, you mentioned that. Eventually there will be people settling estates. The first ones sold will do well but eventually, even those that want bragging rights will have little interest in such items. Apple is already at a point that they no longer have a hold on the market. They may be

Re: Lots of Apple 1 computers @ VCF West

2019-07-08 Thread dwight via cctalk
The value of Apple 1s are clearly a combination of many things. They're about a factor of 500x because they were Apples first product. There is no question about that. Other factors include limited run. The fact that may were turned in for credit to get an Apple II made them even rarer. Value

Re: "half-dollar"/"50 cent piece" Was: Recovering the ROM of an IBM 5100 using OCR

2019-07-01 Thread dwight via cctalk
Not every thing makes sense to go metric. Clearly bold sizes are better off in fractional sizes. Also for wrenches. I have to have 13, 14 and 15 mm wrenches. A 9/16 would have covered the entire range. I have a spot on my car that I need a 23mm offset box wrench. What a pain. Dwight

Re: Recovering the ROM of an IBM 5100 using OCR (among other things)

2019-06-27 Thread dwight via cctalk
I love the walk through things. I'd clearly have found a wired, digital, method of doing it ( printer port or such ). I had a similar problem. I was recovering 4004 code printed out with what looked like a ASR33 print. I did it manually. On looking at the data, I suspect the platen had ruts as

Re: Looking for a Intel multibus 88/30...

2019-06-18 Thread dwight via cctalk
Maybe a iSBC 86/30? I don't have any of these. All I have are a couple 8080 iSBC boards. Dwight From: Lyle Bickley Sent: Tuesday, June 18, 2019 8:49 PM To: dwight Cc: General Discussion: On-Topic and Off-Topic Posts Subject: Re: Looking for a Intel multibus

Re: Looking for a Intel multibus 88/45... (minor corrections...)

2019-06-17 Thread dwight via cctalk
Hi Lyle What is a 88/45? I look up the 310 systems on the web but none mention 88/45. Is the PAL for address decoding or something more complicated? Dwight From: cctalk on behalf of Lyle Bickley via cctalk Sent: Monday, June 17, 2019 1:39 PM To:

Re: HP9816 PAL16L8

2019-06-11 Thread dwight via cctalk
On Tue, 6/11/19, dwight via cctalk wrote: > When I needed to create a PAL from a schematic, I first made > a schematic of what the PAL was suppose to do, using the > same basic model of logic that the PAL provided. Once I was > done, I took the PAL map from the TI book and made red do

Re: HP9816 PAL16L8

2019-06-11 Thread dwight via cctalk
I realize that most are familiar with using the equations to create the PALs but I'm a circuit person more than an equation person for circuits. When I needed to create a PAL from a schematic, I first made a schematic of what the PAL was suppose to do, using the same basic model of logic that

Re: HP9816 PAL16L8 (a...@alanlee.org)

2019-06-10 Thread dwight via cctalk
Again, is it just an address decoder or something more complicated. One can often determine the logic by looking at a schematic and knowing what it needs to do. Dwight From: cctech on behalf of Piero Andreini via cctech Sent: Monday, June 10, 2019 7:58 AM To:

Re: HP9816 PAL16L8

2019-06-08 Thread dwight via cctalk
Do you have a schematic that shows what it does. You could write your own file is not really complicated for a 16L8. I wrote my own for my 6532to6530 adapter for the KIM-1. I'll admit I did a logic mistake the first time but I'd have done the same with palasm. Dwight

Re: Catatonic Rockwell AIM-65

2019-06-04 Thread dwight via cctalk
You might still use the logic analyzer a little. The 6532 is a static part as I recall. You could connect up some wires and attempt a write and read of the 6532. It sounds quite likely to be the issue but it never hurts to check the decoding logic. The ports are usually place at a different

Re: looking for an old IBM knob from a 609 calculator panel

2019-05-28 Thread dwight via cctalk
Hi Bob Even with 3d printing, you'd need to do some sanding and shaping to make it look as clean as the original. I still think casing one is the best option. If the mold is right, it will even match the surface. Dwight From: cctalk on behalf of Bob

Re: looking for an old IBM knob from a 609 calculator panel

2019-05-28 Thread dwight via cctalk
I've never seen one exactly like that before either. You might want to make a mold and create one that way. Dwight From: cctalk on behalf of William Donzelli via cctalk Sent: Tuesday, May 28, 2019 6:42 AM To: Bob Rosenbloom; General Discussion: On-Topic and

Re: Rgb intensity line

2019-04-20 Thread dwight via cctalk
I'm not sure what needs to be done but almost sure a resistor to ground is not likely to be the answer. Give it a try without it first. Dwight From: cctalk on behalf of Bill Degnan via cctalk Sent: Saturday, April 20, 2019 5:33 PM To: General Discussion:

Re: Plane of core memory

2019-04-18 Thread dwight via cctalk
Although, after written, there is little magnetism lost out side of the ring, while being magnetized, there is quite a bit of stray magnetism. By placing the the rings at 90 degrees, it minimizes the magnetism induced in the adjacent ring. The fields follow the inverse square law so the effect

Re: Plane of core memory

2019-04-18 Thread dwight via cctalk
I don't believe there is a simple non-destructive way to read the state. If you could remove the cores, I believe you could put each core in a weak magnetic field. As the field passes from side to side, one should be able to determine the direction of the saturated cores because one side would

Re: Plane of core memory

2019-04-18 Thread dwight via cctalk
My understanding was that the mercury delay lines needed periodic repairs ( not sure what the cause was but mercury does dissolve into many metals ). If I were going to make a delay line memory, I'd go with the magnetostrictive. These are practical to make. One just needs a little ingenuity and

Re: Control Console, but not PDP-10

2019-04-12 Thread dwight via cctalk
It is funny that the fellow that is selling the DSKY may not have the legal right to sell it. It may technically belong to the trash company that collected the rest of the stuff. I'm a trash scrounger myself but there are differences with stuff no one cares about and things of value. Dwight

Re: Game of Life for PDP-8

2019-04-08 Thread dwight via cctalk
For those searching on the web, look for life and Conway. Otherwise you get a lot of other junk. There is an interesting video of an interview with John done not to many years ago. Dwight From: cctalk on behalf of dwight via cctalk Sent: Monday, April 8, 2019

Re: Game of Life for PDP-8

2019-04-08 Thread dwight via cctalk
When I first got my arduino and connected it to a small oled screen I thought about a script to generate life on the screen. As it was, I wrote a pong game, using pots for paddles. One thing to think about, in life, is how to deal with edges. One way is that the bits could just fall off. Another

Re: IBM 360 Model 50 information?

2019-03-29 Thread dwight via cctalk
>From an emulation standpoint, latch or flop is not necessarily an issue. It is >that it is a state holding element. The only potential issue is if he was >doing clock cycle emulation. He'd need to understand what was originally >considered a clock cycle. Dwight

Re: AW: 50Hz Pulley for 8" Floppy Drive Mitshubishi M2894-63B

2019-03-27 Thread dwight via cctalk
From: cctalk on behalf of Chuck Guzis via cctalk Sent: Wednesday, March 27, 2019 2:07 PM To: dwight via cctalk Subject: Re: AW: 50Hz Pulley for 8" Floppy Drive Mitshubishi M2894-63B On 3/27/19 1:36 PM, dwight via cctalk wrote: > Most all 8 inch drives were synchronous capacitive p

Re: AW: 50Hz Pulley for 8" Floppy Drive Mitshubishi M2894-63B

2019-03-27 Thread dwight via cctalk
Most all 8 inch drives were synchronous capacitive phased AC motors. That is until 3 phase low voltage motors started showing up on 5.25 disk drives. The ac motors on the 8 inch drives rarely had jumper options for 120/240V AC. Most were fixed voltage and cycles. I can't recall any that I've

Re: What 6502 macro assembler was used for the AIM-65 Monitor ROM?

2019-03-27 Thread dwight via cctalk
The next question is, does anyone have a disk with directory structure and utilities? Dwight From: cctalk on behalf of dwight via cctalk Sent: Wednesday, March 27, 2019 6:15 AM To: Glen Slick; General Discussion: On-Topic and Off-Topic Posts Subject: Re: What

Re: What 6502 macro assembler was used for the AIM-65 Monitor ROM?

2019-03-27 Thread dwight via cctalk
Hi Glen Sorry for not replying right away. I've been on the road. No, I've not gotten the manual. I do have a disk controller board with my system. I'd have to look back to see what disk controller code was in the ROMs. I suspect it might just be to read the first bock of data and then expect

Re: What 6502 macro assembler was used for the AIM-65 Monitor ROM?

2019-03-21 Thread dwight via cctalk
It is possibly an in house generated assembler. It may even have been written in Forth. Most Forth assemblers are written as single pass but it is not hard to make it a multiple pass. Such an assembler could have been cobbled together in Forth in a couple weeks of one programmer. I do know that

Re: Pioneers of computing

2019-03-11 Thread dwight via cctalk
Calculators are clearly a step in the progression. Also, clearly not the beginning. To pick any one even and say that was the beginning is absurd. There are to many steps involved. The need to do mathematical calculations was clearly a driving force but that goes back before Babbage. Dwight

Re: Rainbow 100 PSU capacitor list

2019-03-01 Thread dwight via cctalk
Maybe I need a little clearification. When you turn the switches off, it boots? Dwight From: cctech on behalf of Alan Perry via cctech Sent: Friday, March 1, 2019 1:35 PM To: Ethan Dicks Cc: General Discussion: On-Topic Posts Subject: Re: Rainbow 100 PSU

Re: Ultimate FDC? (Was: IBM 6360 - Filesystem(ish) info?

2019-02-19 Thread dwight via cctalk
Actually, I'd like to see it just read/write flux changes + index marks onto a SD card for later analysis. Building all the smarts into the controller means that some formats will get missed. One can later write translation code for what ever format one has. Make this information open source,

Re: Q: Plotter bed repair with MonoKote?

2019-02-18 Thread dwight via cctalk
I find that it is too much pre-stretched I carefully remove some of the stretch with a heat gun and a frame to hold it. You'd need to experiment some. It has to have a little stretch left to shrink. Dwight From: cctech on behalf of David Collins via cctech

Re: Kemners Surplus - Real time walkthrough

2019-02-18 Thread dwight via cctalk
There were a couple hp XY plotters that had the mylar plate delaminating. I've reworked these with model airplane mono coat. I'd be interested in one of these if they'd not been to far away. If you do a search, there is also a youtube video of a more extended walk through. The fellow was also a

Re: Intel Universal Prom Programmer UPP 103 documentation

2019-02-16 Thread dwight via cctalk
Not sure how much this will help but the EPROM programmer boards were an evolutionary thing. The UPP-816 would be quite similar to the UPP-833, except for extra stuff for voltage control and added addresses. What is the issue you are having with the board? Dwight

Re: WTB : CTL, CTuL 9956 ??

2019-02-05 Thread dwight via cctalk
I'm curious as to what the 9956 is for? One might be able to hack something together with a NPN transistor and a TTL and gate. This looks to be one of the oddball chips that Fairchild made in the early days, before most settled down to TTL being the more common. Dwight

Re: OT Parts houses & scrappers

2019-01-28 Thread dwight via cctalk
Will is right. You have to convince them that it will be worth their time to sort that particular item out, find packaging to send it and deal with the typical book keeping required by their particular state, as compared to the time/return of just tossing it into the fire to burn off the

Re: HP 1000 A class series boards

2019-01-28 Thread dwight via cctalk
The resistor goes on the battery plug or the unit will not power up. The computer was suppose to have a battery bank to keep the DRAM from losing data when turned off, like the original core used on earlier machines. The resistor detected the battery pack that one rarely use. Dwight

Re: OT RE: Bogus "account hacked" message

2019-01-10 Thread dwight via cctalk
Early on, I had a telephone call where they told me that their testing showed that my computer had a virus. They would fix it for me for only $50. At the time, I didn't even have a computer connected to the web at home ( lived in the mountains ). Dwight From:

Re: OT? Upper limits of FSB

2019-01-09 Thread dwight via cctalk
As long as things stay in a pipe, instruction decode and execution looks to execute in one cycle. Pipe flushes are the penalty. That is where speculative execution pays off. ( also food for Meltdown and Spectre type security holes ). Such loops are quite fast if the prediction was right.

Re: Teaching Approximations (was Re: Microcode, which is a no-go for

2019-01-09 Thread dwight via cctalk
Recently, in the calculator group, a fellow has an older calculator and was using the power function. You know x^y. He'd put in 2^2 and got 3.8 or something where the last digit was 2 off. He was worried that the calculator was bad. I explained to him that the calculator was fine. It was

Re: Teaching Approximations (was Re: Microcode, which is a no-go for

2019-01-08 Thread dwight via cctalk
There is an algorithm to calculate any digit of PI as long as it is in HEX ( or base 16 ). So far no one has been able to do this in a decimal system. It would seem that out binary computers were close to right in the first place. Dwight From: cctalk on behalf

Re: Microcode, which is a no-go for modern designs

2019-01-08 Thread dwight via cctalk
To Tell you the truth, I can't think of anything other than speed of calculating that should be done in floating point. The speed is because we've determined to waste silicon for floating point when we should really be using combined operation in integer that are designed to handle multiple

Re: OT? Upper limits of FSB

2019-01-06 Thread dwight via cctalk
Probably the factor that most think limits thing is the turn-around time. If they were limited to one byte request and wait for that data to return, the limits of wires would be a wall. Today's serial RAMs send a burts of data rather than a word or byte at a time. These blocks of data can use

Re: Microcode, which is a no-go for modern designs

2019-01-04 Thread dwight via cctalk
May ability to understand these papers is somewhat limited. If I understand correctly the following. Most divide routines that I've seen allow the remainder to be 1,0,-1 relative to the normal remainder. The answer will converge as the error of the remainder never leaves this range. In the case

Re: Microcode, which is a no-go for modern designs

2019-01-02 Thread dwight via cctalk
From: Eric Smith Sent: Wednesday, January 2, 2019 3:42 PM To: dwight; General Discussion: On-Topic and Off-Topic Posts Subject: Re: Microcode, which is a no-go for modern designs On Wed, Jan 2, 2019 at 4:12 PM dwight via cctalk mailto:cctalk@classiccmp.org>> wrote: I thought I'

Re: Microcode, which is a no-go for modern designs

2019-01-02 Thread dwight via cctalk
I thought I'd note that the divide problem couldn't have been patched with a micro code patch. It was because one of the ROM arrays used as part of the divide lookup was missing its data. It would have been much more than a simple patch to fix. It would have had to go back to a full subroutine

Re: OCR old software listing

2018-12-31 Thread dwight via cctalk
Fred is right, OCR is only worth it if the document is in perfect condition. I just finish getting an old 4004 listing working. I made only two mistakes on the 4K of code that were not the fault of the poorness of the listing. Twice I put LDM instead of LD. LDM was the most commonly used. There

An interesting talk about Apollo Guidance Computer

2018-12-18 Thread dwight via cctalk
Carl talks about the restoration he is doing with the computer and some video cuts. Carl has several complete videos on this web page as well. https://youtu.be/3rz7gAOWVsI?t=3188 Dwight

Re: Picking tubular locks (WAS : Text encoding Babel. now PICKING LOCKS OR FINDING KEY MFR AND KEY #

2018-12-02 Thread dwight via cctalk
. Dwight From: cctalk on behalf of dwight via cctalk Sent: Sunday, December 2, 2018 6:33 PM To: General Discussion: On-Topic and Off-Topic Posts Subject: Re: Picking tubular locks (WAS : Text encoding Babel. now PICKING LOCKS OR FINDING KEY MFR AND KEY

Re: Picking tubular locks (WAS : Text encoding Babel. now PICKING LOCKS OR FINDING KEY MFR AND KEY #

2018-12-02 Thread dwight via cctalk
on behalf of Fred Cisin via cctalk Sent: Sunday, December 2, 2018 6:19 PM To: General Discussion: On-Topic and Off-Topic Posts Subject: Re: Picking tubular locks (WAS : Text encoding Babel. now PICKING LOCKS OR FINDING KEY MFR AND KEY # On Mon, 3 Dec 2018, dwight via cctalk wrote: > Fred is proba

Re: Picking tubular locks (WAS : Text encoding Babel. now PICKING LOCKS OR FINDING KEY MFR AND KEY #

2018-12-02 Thread dwight via cctalk
ou can use it as a temporary key for anything for which you already have the code (suc as XX2247!) On Sun, 2 Dec 2018, dwight via cctalk wrote: > Looking at how things work, there is a new method used to pick locks that > works a little to well. It is a thing called a bump

Re: WAS : Text encoding Babel. now PICKING LOCKS OR FINDING KEY MFR AND KEY #

2018-12-02 Thread dwight via cctalk
Looking at how things work, there is a new method used to pick locks that works a little to well. It is a thing called a bump key. To make one for this cylinder lock would be tricky. Still, it could be done. The principle is that you bounce the tumbler pins in, while holding light tension. The

Re: Teletype cheap

2018-11-24 Thread dwight via cctalk
I wonder if anyone made a 3d printer file for a 33 chad box? Dwight From: cctalk on behalf of steve shumaker via cctalk Sent: Thursday, November 22, 2018 11:39 AM To: W2HX; General Discussion: On-Topic and Off-Topic Posts Subject: Re: Teletype cheap Thanks for

Re: What is windoes doing?

2018-11-20 Thread dwight via cctalk
5:43 AM To: cctalk@classiccmp.org Subject: Re: What is windoes doing? On 11/19/2018 11:34 AM, dwight via cctalk wrote: > I have a question. I use the USB port for serial. In my program, I use a > fixed com port. When going to the control panel, I find that I see (in use) > tag

Re: What is windoes doing?

2018-11-19 Thread dwight via cctalk
Actually, I do use it almost exclusively with classic machines. I use the RS232 to load and talk to my Nicolet 1080 ( a late 1960s to early 1970 ) machine. I just got done using it to repair a North * Horizon. If I'm leaving trails behind me that I can't get rid of, each time I use it as a

Re: What is windoes doing?

2018-11-19 Thread dwight via cctalk
Hi Ethan That is entirely possible. I do think about it when I plug and unplug the USB floppy drive but not usually for the serial. Is there a way to finish them or maybe stick things in so that I can "safely remove" things? Most of the time for serial, I use a FTDI but I do have some older

What is windoes doing?

2018-11-19 Thread dwight via cctalk
I have a question. I use the USB port for serial. In my program, I use a fixed com port. When going to the control panel, I find that I see (in use) tags on some of the com ports. I'm the only one currently using the com ports but recently another (in use) showed up, requiring me to modify my

Re: AW: 50Hz Pulley for 8" Floppy Drive Mitshubishi M2894-63B

2018-11-10 Thread dwight via cctalk
If the pulley diameter was 19.0mm, the new pulley would be exactly 22.8mm. It is a simple ratio problem. The motors rotation is synchronous to the line frequency. It turns 50/60 too slow. To speed it up is 6/5. The speed of the belt is proportional to the radius of the pulleys. If it was a

Re: AW: 50Hz Pulley for 8" Floppy Drive Mitshubishi M2894-63B

2018-11-10 Thread dwight via cctalk
To: dwight via cctalk Subject: Re: AW: 50Hz Pulley for 8" Floppy Drive Mitshubishi M2894-63B On 11/10/18 7:55 AM, dwight via cctalk wrote: > Typically, both the motor pulley and belt are changed as a set to keep the > distance from motor to flywheel the same. > In my younger days, a frien

Re: AW: 50Hz Pulley for 8" Floppy Drive Mitshubishi M2894-63B

2018-11-10 Thread dwight via cctalk
Typically, both the motor pulley and belt are changed as a set to keep the distance from motor to flywheel the same. In my younger days, a friend and I ground down a motor pulley, on a 50 Hz Shugart 800, to be a 60 Hz. We used a file while the motor ran. After getting the right size, we had to

Re: UNIVAC 422 User Grouop Forming Please drop us a note offlist With SN of your unit and stats of operability and completeness and go withs.

2018-11-04 Thread dwight via cctalk
I was curious. It would seem that it would be easy enough to make an emulator or simulator for but the OCR is really bad. There may be one out there. It would be a shame if yours was the last one. Dwight From: ED SHARPE Sent: Sunday, November 4, 2018 9:00 AM To:

Re: UNIVAC 422 User Grouop Forming Please drop us a note offlist With SN of your unit and stats of operability and completeness and go withs.

2018-11-03 Thread dwight via cctalk
These sound really cool but I suspect the number of people with a Univac 422 are quite limited. Even those with Univac panel of any kind are quite limited. I see the web page has a OCR of the text. A photo copy of the manual would be great as well. Dwight From:

Re: behaviour of classic PDP-8 frontpanel

2018-10-30 Thread dwight via cctalk
My Nicolet did the same thing it would load 0 into the intended start location ( on my machine it was a jump to 0 ). The front panel worked fine otherwise. It turned out to be some missing clocks because of a bad 7474. Strange that a common problem on different machine created by completely

Re: Aphorism (Was: Computers that never crash (Was: Microsoft-Paul Allen)

2018-10-23 Thread dwight via cctalk
I had an Ultra Sparc machine that ran continuously for more than 5 years except for maybe 2 power outages and a couple time to vacuum it out. The only failure was one day the disk drive let out a stream of smoke. It was a tantalum capacitor. It burned the board. IT was going to give me a new

Re: Apple IIe addendum

2018-10-14 Thread dwight via cctalk
These machines used at least two different key switches, that I've seen. I've been looking for a broken key switch and the one a friend had was different. Mine has a broken post on one key. Dwight From: cctalk on behalf of drlegendre via cctalk Sent: Sunday,

Re: BPK-72 or Bubble Memory Dummy Module + Seed Module

2018-10-09 Thread dwight via cctalk
CHM has these in their collection. Where are you located at? They don't look really complicated. I'd think one could make one if they had a schematic. Dwight From: cctalk on behalf of Josh via cctalk Sent: Monday, October 8, 2018 9:42:22 AM To: General

Re: Rayethon Computer AN/FYK9 CMI Store 33

2018-09-25 Thread dwight via cctalk
Nicolet 1080 is 20 bit data but has 16 bit address space. No stack functions. It has a register called link but that is only a single bit carry. Subroutines use the first address to store the return, meaning they were not recursive without something to save the returns ( I think dec did this

Re: Advice requested on proper disposal of Seagate ST3000DM001 disk drives

2018-09-21 Thread dwight via cctalk
I'd think a nice blast with a oxy-acetylene torch should do what is needed. Even if it doesn't melt the disk, it will surely exceed the Currie point and all data is gone. Dwight From: cctalk on behalf of Jerry Weiss via cctalk Sent: Friday, September 21,

Re: Advice requested on proper disposal of Seagate ST3000DM001 disk drives

2018-09-21 Thread dwight via cctalk
All the molten lava is done. You could still smash it with a lava rock. Dwight From: cctalk on behalf of Chuck Guzis via cctalk Sent: Friday, September 21, 2018 11:36:25 AM To: Fred Cisin via cctalk Subject: Re: Advice requested on proper disposal of Seagate

Re: SAGE memory plane

2018-09-18 Thread dwight via cctalk
Its a shame it wasn't in the complete unit. Unless someone actually erases it, core memory will hold data until the sun swells up, as a red giant, and toast the earth. One always wonders what one would find on these old cores. Dwight From: cctalk on behalf

Re: Looking for two DEC H445 power bricks for PDP 11/40 project

2018-09-17 Thread dwight via cctalk
I had a problem with brick power supplies a number of years back. I found an issue that caused them to fail. I had about ten of them on the same power switch. You'd think this would not be an issue but it is. You see it works like this, each one had a transformer in it. When you disconnect the

Re: Unknown US manufacturer - try again

2018-09-12 Thread dwight via cctalk
See 946 fairchild for pinout. Dwight From: cctech on behalf of Chuck Guzis via cctech Sent: Wednesday, September 12, 2018 12:39:44 PM To: Peter Van Peborgh via cctech Subject: Re: Unknown US manufacturer - try again I suspect that it's from a trainer of some

Re: HP-2116 front panel lamps

2018-07-25 Thread dwight via cctalk
It might be worth saving the bases and buying "grain of wheat" lamps to rebuild the lights. I see ~70ma 6v lamps available. That sounds similar to the original specification. Dwight From: cctalk on behalf of Brent Hilpert via cctalk Sent: Wednesday, July

Anyone in Europe with a North* Horizon or Advantage in working condition

2018-07-24 Thread dwight via cctalk
Hi I'm trying to assist Jeff with HxC to create a Gotek that can work with the North* hard sectored disk. It has been problematic because of timing constraints. Jeff has been working with several in the US but it is difficult to see what factors are important, working remotely. Jeff is in

Re: GoTEK SFR1M44-U100...

2018-07-19 Thread dwight via cctalk
One thing that bothers me is the continued emphasis on arithmetic and not on mathematics. The kids growing up today will rarely be more than a few feet from a calculator. The first thing on the math test was the "No calculator allowed". I'm not saying that they shouldn't be taught arithmetic

Re: Anyone have a HALstation 300 install CD?

2018-07-18 Thread dwight via cctalk
the HaL compiler, no license required ). Dwight From: cctalk on behalf of dwight via cctalk Sent: Thursday, July 12, 2018 12:06:59 PM To: Al Kossow; General Discussion: On-Topic and Off-Topic Posts Subject: Re: Anyone have a HALstation 300 install CD? I may

Re: GoTEK SFR1M44-U100...

2018-07-17 Thread dwight via cctalk
I still don't know for sure which way to do 8 inch compared to 5.25. I usually try to write both ways but soon forget which is which. It won't do any good to tell me as I'll still forget. I just remember the 8 inch drives were different. Another good quiz question is where the index hole was

  1   2   3   >