Rack-mount or tabletop version of DEC RX50 floppy drive?

Did DEC offer a rack-mount or tabletop box version of the RX50 floppy drive, as they did with e.g. the TU58 and TK50 tape drives? I'm wondering how they expected the RX50 drive to be packaged when used with a Unibus PDP-11 via the RUX50 controller.

Re: Ethernet names...

On Tue, Oct 2, 2018, 11:47 Bill Degnan via cctalk wrote: > Ethernet was the name given to the Alto (XEROX) Aloha Network It wasn't an Aloha Network. created (?) > by Bob Metcalff (sp?), which was based/inspired by an improved version of > the ALOHANET used by the U of Hawaii. In their CACM

Re: Ethernet names...

On Tue, Oct 2, 2018, 11:35 Grant Taylor via cctalk wrote: > Does anybody know names / terms that correspond to the original 3 Mbps > Ethernet? > > I.e. 10 Mbps Ethernet is also knows as Ethernet II (2) and D.I.X. (for > Digital, Intel, and Xerox). > > Was the first 3 Mbps Ethernet simply called

early ANSI C drafts, pre-1989 standard

I'm interested in looking at any published drafts prior to the C 1989 standard. I found X3J11-88-090 here: https://yurichev.com/ref/Draft%20ANSI%20C%20Standard%20(ANSI%20X3J11-88-090)%20(May%2013,%201988).txt That makes mention of the previous draft being X3J11-88-001. Does anyone still have a

Re: SPACEWAR! Switch Boxes for a PDP-12

On Mon, Sep 24, 2018 at 11:23 AM, Robert Feldman via cctalk < cctalk@classiccmp.org> wrote: > >that is what the PDP-1 at CHM has been using for over 10 years > > https://na.suzohapp.com/products/pushbuttons/58-9166-L Ken Sumrall built the Spacewar control boxes used at the museum, with some

Re: DEC H744 +5 supply

> > * If you supply a link & location to a schematic I'll take a look, I don't > feel like wading around in bitsavers pdfs to try to find it right now. page 207 of: http://bitsavers.trailing-edge.com/pdf/dec/pdp11/1140/PDP-1140_System_Engr_Drawings_Rev_P_Jun74.pdf

Re: DEC H744 +5 supply

On Fri, Sep 21, 2018 at 1:38 PM, Noel Chiappa via cctalk < cctalk@classiccmp.org> wrote: > My understanding is that, without using a transformer (which creates an > independent circuit loop - more below), there's no way to increase the > _amperage_ out of circuit over what's fed into it: since

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

On Fri, Sep 21, 2018 at 12:06 PM, Fred Cisin via cctalk < cctalk@classiccmp.org> wrote: > Eric hasn't specified [and shouldn't have to] as to WHY, > but here are some idle speculations: > Mostly #6, and a little bit of #5. I'd be delighted to offer "retaliation in kind for the SS damage of

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

On Fri, Sep 21, 2018 at 11:28 AM, Fred Cisin via cctalk < cctalk@classiccmp.org> wrote: > Put it in a gift-wrapped box next to you on the bus. > Whoever steals it will get just what they deserve. > :-) But actually I wouldn't wish ST3000DM001 drives on my worst enemy!

Re: HP 2000 /2100 emulator ?

On Fri, Sep 21, 2018 at 8:18 AM, Pete Lancashire via cctalk < cctalk@classiccmp.org> wrote: > emulate an HP 2000 or even in modern 2100 my goal is nothing serious I'd > love to be able to do HP basic and find the version of Star Trek I think > > If I could have my dream come true the emulator

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

On Fri, Sep 21, 2018 at 6:51 AM, systems_glitch via cctalk < cctalk@classiccmp.org> wrote: > Burning of potassium permanganate to manganese greensand will often get it > going. You are on your own for figuring out how to do that. > Multiple sources, including Robert on this list, tell me just to

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

On Fri, Sep 21, 2018 at 6:04 AM, Bill Gunshannon via cctalk < cctalk@classiccmp.org> wrote: > Or just throw it in the garbage. That's way too good for these

Advice requested on proper disposal of Seagate ST3000DM001 disk drives

Anyone have advice on making thermite? Ingredients, sources, proportions? The internet seems to think that just using aluminum powder with ferric oxide is relatively hard to ignite, and that some manganese dioxide would help with that. Without spending too much time shopping, it looks like I can

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

On Tue, Sep 18, 2018 at 8:27 AM, Noel Chiappa via cctalk < cctalk@classiccmp.org> wrote: > (Note that if you have an old > machine/harness, there's a jumper you have to add if you have only a single > H745; see the second paragraph on page 6-18 of DEC-11-H40SA-B-D.) > I totally missed that. It

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

On Tue, Sep 18, 2018 at 2:11 AM, P Gebhardt via cctalk < cctalk@classiccmp.org> wrote: > As I don't have core memory modules available, I thought of using MS11 > memory, > which, according to my research, seems to be an option for 11/40 systems. > The system manual states on page 6-7 that the

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

On Mon, Sep 17, 2018 at 4:17 PM, dwight via cctalk wrote: > 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

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

On Mon, Sep 17, 2018 at 1:30 PM, Henk Gooijen via cctalk < cctalk@classiccmp.org> wrote: > As far as I know, the 11/40 uses only one H745. > And vague memory seems te recall that the -15V brick is an “odd one”, > because, unlike all other bricks, it needs the +15V from the regulator that > is

Re: cctalk Digest, Vol 48, Issue 17

On Mon, Sep 17, 2018 at 1:11 PM, Jeffrey S. Worley via cctalk < cctalk@classiccmp.org> wrote: > What kind of cores does it use? > Pretty ordinary core memory. Being an early system, the cores were rather large, so high currents were needed for read and write. There was forced air temperature

Re: VT100's

On Thu, Sep 6, 2018 at 1:14 PM, Carlo Pisani wrote: > > > cause it's the simplest, I guess > > The VT100 was quite complicated compared to contemporary terminals at the > > time of its introduction. > > why do you say that? > a vt100 terminal requires only a text VDU (video display unit) with >

Re: VT100's

On 09/06/2018 09:37 AM, Carlo Pisani via cctalk wrote: > cause it's the simples, I guess > The VT100 was quite complicated compared to contemporary terminals at the time of its introduction. On Thu, Sep 6, 2018 at 10:22 AM, Grant Taylor via cctalk < cctalk@classiccmp.org> wrote: > I used to

Re: Article on Gopher with Cam in it

I especially like the description of the UMN Shepherd Labs building having no windows, placed directly beneath a photo of the building with around 150 windows visible.

Re: Datic 2000 / Ampex 844 Documentation ?

On Thu, Aug 23, 2018 at 2:37 PM, jos via cctalk wrote: > First time I have seen a 14" drive on a CP/M system > There were some versions of CP/M on the Intel MDS development system (the _original_ CP/M machine) with support for the Intel MDS 740 hard disk system, which was an Intel SBC 206

Re: DTC TakeTen media?

On Thu, Aug 23, 2018 at 2:20 PM, Chuck Guzis via cctalk < cctalk@classiccmp.org> wrote: > The thing that really brought Drivetec down was that you had to use > their factory-preformatted embedded-servo floppy media. It was > expensive (about $15 each in 1986). > Same with Iomega ZIP disks

Re: First 3.5 inch FDD [WAS: RE: Prototype IBM DemiDiskette drive]

On Thu, Aug 23, 2018 at 12:43 PM, Tom Gardner via cctalk < cctalk@classiccmp.org> wrote: > Well it all depends upon what u mean by "first" > > The Sony drive and cartridge were not compatible in many ways with what > became the physical, magnetic and electrical interface standards for the >

Re: Prototype IBM DemiDiskette drive

On Thu, Aug 23, 2018 at 12:51 PM, Tom Gardner wrote: > It was the SA200 a 2/3rds height (51 mm) 5¼-inch FDD at $118 in quantities > of 5,000 or more. It was sold in 1982 but got killed by the true ½ > heights which Shugart OEMed from Matsushita. > Hi Tom, The SA200 came later, and just from

Re: Prototype IBM DemiDiskette drive

On Wed, Aug 22, 2018 at 3:11 PM, Fred Cisin via cctalk < cctalk@classiccmp.org> wrote: > Are you sure that that was 750ms track to track step, not 75ms? > Yes. From innermost track back to track 0 was even slower.

Re: Prototype IBM DemiDiskette drive

On Wed, Aug 22, 2018 at 1:09 PM, Al Kossow via cctalk wrote: > I just picked up a Model 350 on eBay, just because I'd never seen > a Shugart sub 5" drive. > Unfortunately I don't recall the model number, but there was a Shugart 5 1/4" drive that made it at least to prototype and field test

Re: Single-height Qbus grant continuity PCB

On Tue, Aug 14, 2018 at 9:52 AM, Tony Duell via cctalk < cctalk@classiccmp.org> wrote: > But I have here a little square board (the same size as the older Unibus > grant > continuity card) with just 2 pairs of pins linked. In the etch is a > Digital logo (so > I assume it's a real DEC product)

Re: German Translation, Serial Port?

On Thu, Aug 9, 2018 at 8:26 PM, Bill Gunshannon via cctalk < cctalk@classiccmp.org> wrote: > On 08/09/2018 09:39 PM, W2HX via cctalk wrote: > > Hello friends. I need a translation from a German manual describing > serial port parameters. I used google translate but it doesn't quite give > me the

Re: RQDX3 formatter

On Fri, Aug 3, 2018 at 10:08 AM, Bob Smith via cctalk wrote: > http://www.vcfed.org/forum/showthread.php?38940-Patching- > ZRQCH0-to-use-any-geometry-MFM-hard-disk-on-RQDX3 > Is there some reason Lou doesn't want his document made publicly available on a web page?

Re: RK05 spindle pulleys - trade 50Hz vs 60Hz?

On Wed, Jul 25, 2018 at 12:17 PM, Tony Duell wrote: > On Wed, Jul 25, 2018 at 5:48 PM, Eric Smith via cctalk > > Some products were built using different transformers for 50 vs 60 Hz > > models, and the 60 Hz models uses a transformer inadequate for 50 Hz > > operation. >

Re: RK05 spindle pulleys - trade 50Hz vs 60Hz?

On Wed, Jul 25, 2018 at 7:54 AM, Paul Koning via cctalk < cctalk@classiccmp.org> wrote: > > On Jul 25, 2018, at 9:50 AM, GerardCJAT via cctech < > cct...@classiccmp.org> wrote: > > > > Why don't you simply power it through an inverter that will output 60 > Hz, eventually even "down to" 120 V ,

Re: how good is the data reliability with CD ROM and DVD RAM?

I wrote a lot of DDS2 and DDS3 tapes back in the day. When my DDS3 drive broke, I got another drive. I found out that my first drive was seriously out of calibration, and though it could read its own tapes, other drives could not. All the data was gone. I'm considering getting an LTO drive, but I

Re: how good is the data reliability with CD ROM and DVD RAM?

On Mon, Jul 23, 2018 at 11:48 AM, Chuck Guzis via cctalk < cctalk@classiccmp.org> wrote: > I think that the use of tapes in the 23rd century justifies their > reputation for durability: > > http://memory-alpha.wikia.com/wiki/Microtape Very impressive, since Microtape was first sold in 1963, as

Re: GoTEK SFR1M44-U100...

On Tue, Jul 17, 2018 at 2:49 PM, Grant Taylor via cctalk < cctalk@classiccmp.org> wrote: > I conceptually get that the GoTEK can't go any faster than the Floppy's > IDE (I thought floppy was a derivative of IDE.) bus can carry the data. IDE came much later and isn't very similar to the floppy

Re: GoTEK SFR1M44-U100...

On Mon, Jul 16, 2018 at 4:58 PM, Fred Cisin wrote: > On the Lisa "Twiggy" diskettes, they made special provision to get more >>> thumb prints. >>> >> > On Mon, 16 Jul 2018, Eric Smith wrote: > >> I imagine you're aware of the actual reason for the two diametrically >> opposing jacket cutouts for

Re: GoTEK SFR1M44-U100...

On Mon, Jul 16, 2018 at 4:17 PM, Fred Cisin via cctalk < cctalk@classiccmp.org> wrote: > On the Lisa "Twiggy" diskettes, they made special provision to get more > thumb prints. > :-) I imagine you're aware of the actual reason for the two diametrically opposing jacket cutouts for the read/write

Re: GoTEK SFR1M44-U100...

On Sat, Jul 14, 2018 at 10:22 PM, Chuck Guzis via cctalk < cctalk@classiccmp.org> wrote: > So has any of the firmware writers for the GoTek implemented the Victor > 9000 scheme (zoned+GCR) yet? Just curious. > I have a Victor 9000, so I've been meaning to add support to fluxtoimd to be able to

Null program (was Re: ITS DDT anecdote)

That reminds me of one of my favorite computer trivia questions: What is the shortest useful CP/M program?

Re: Another DCJ11 oddity

On Tue, Jul 10, 2018 at 1:38 PM, Noel Chiappa via cctalk < cctalk@classiccmp.org> wrote: > > From: Jerry Weiss > > In addition to above, there is a bypass cache bit in the PDR (section > > 1.5.6.2) for finer control. > > Yes, I only found that out last night (or maybe I saw it on a

Re: Who is eBay's customer was RE: SMS floppy disk controller

On Mon, Jul 9, 2018 at 1:57 PM, Ali via cctalk wrote: > Yeah, well that is the age old argument. As far as I am concerned he who > ponies up the cash is the customer. The sellers may be "customers" for eBay > store front ends or advertising but the main business/revenue model is the > fee on

Re: SMS floppy disk controller

On Sun, Jul 8, 2018 at 10:12 PM, Ali via cctalk wrote: > Yeah, I hate it when ebay gets creative. It usually ends up screwing the > customers/buyers. > I don't think eBay considers the buyers to be their customers.

Re: ok I have to ask...confirm direction of GRANT continuity cards please

On Thu, Jun 28, 2018 at 8:26 PM, Bill Degnan via cctech < cct...@classiccmp.org> wrote: > I have always pointed my grant continuity cards in the same direction as a > NPG card, with the traces to the left/facing the last slot of the > backplane. I am 99% sure this is right but I was asked and I

Re: Thicknet/10base5 Test Segment: The Cable is In!

On Thu, Jun 28, 2018 at 8:39 PM, Jon Elson via cctalk wrote: > On 06/28/2018 12:22 PM, Liam Proven via cctalk wrote: > >> What amazed me is that none of the NICs blew, none of the machines failed >> or died. Once the cabling was sorted, it was OK. Who knew that BNC Ethernet >> ports could handle

Re: Thicknet/10base5 Test Segment: The Cable is In!

On Fri, Jun 29, 2018 at 7:31 AM, Paul Koning via cctalk < cctalk@classiccmp.org> wrote: > People have used RS232 over longer distances, of course, and gotten away > with it. > And I would have gotten away with it, too, if it hadn't been for those meddling ground potential differences!

Re: Thicknet/10base5 Test Segment: The Cable is In!

On Thu, Jun 28, 2018 at 2:20 PM, Chuck Guzis via cctalk < cctalk@classiccmp.org> wrote: > So, on a TIA/EIA/RS-232C DB-25 connector, what's the official position > on pin 1? The standards calls it PGND = Protective ground and most > reference seem to indicate that this is chassis/earth ground at

Re: Thicknet/10base5 Test Segment: The Cable is In!

On Thu, Jun 28, 2018 at 7:18 AM, Paul Koning via cctalk < cctalk@classiccmp.org> wrote: > > On Jun 28, 2018, at 4:52 AM, Peter Coghlan via cctalk < > cctalk@classiccmp.org> wrote: > > On a slightly different point, didn't the thickwire spec call for the > outer > > conductor of the cable to be

Re: Thicknet/10base5 Test Segment: The Cable is In!

On Wed, Jun 27, 2018 at 12:39 PM, Paul Koning wrote: > This reminds me of a research project done at DEC that at one point was > discussed as a possible product but didn't happen: an Ethernet segment > mapping device. It was called "packet voltmeter". The idea was that you'd > have one at each

Re: Thicknet/10base5 Test Segment: The Cable is In!

On Wed, Jun 27, 2018 at 10:59 AM, Paul Koning wrote: > > On Jun 27, 2018, at 12:36 PM, Eric Smith via cctalk < > cctalk@classiccmp.org> wrote: > > Collision detection was the reason (or at least _a_ reason) why the > spacing > > of taps on the 10BASE-5 "

Re: Thicknet/10base5 Test Segment: The Cable is In!

On Tue, Jun 26, 2018 at 8:13 PM, Jon Elson wrote: > On 06/26/2018 06:20 PM, Eric Smith via cctalk wrote: > >> On 06/26/2018 03:15 PM, Grant Taylor via cctalk wrote: >> >>> I can only guess that having a terminator too close interferes with or >>>>

Re: Thicknet/10base5 Test Segment: The Cable is In!

On Tue, Jun 26, 2018 at 4:37 PM, Chuck Guzis via cctalk < cctalk@classiccmp.org> wrote: > On 06/26/2018 03:15 PM, Grant Taylor via cctalk wrote: > > > I can only guess that having a terminator too close interferes with or > > weakens the signal too much in some way. > > Exactly what would the

Re: 6800 fig-FORTH?

On Sat, Jun 23, 2018 at 1:16 PM, Stephen Pereira via cctech < cct...@classiccmp.org> wrote: > Has anyone here ever seen or ever had fig-FORTH for the 6800 working? > In the mid-1980s I know someone with a WaveMate 6800 system. He had fig-Forth running on FLEX. At the time I was only interested

Re: Weird Lear-Siegler ADM-3A board

On Tue, May 29, 2018 at 1:10 AM, Eric Smith wrote: > On Fri, May 25, 2018 at 3:30 PM, Adrian Graham via cctalk < > cctalk@classiccmp.org> wrote: > >> Wow, good spot! This one isn’t badged but we just assumed it had fallen >> off. Just as I’m typing this he’s messaged me to say it’s actually the

Re: Lots of old DEC stuff

On Fri, Jun 15, 2018 at 1:15 PM, Ethan Dicks via cctalk < cctalk@classiccmp.org> wrote: > I have one but have never found a source of patch cables/bare pins. > IIRC, mini-banana (2.6mm) plugs and patch cables are suitable.

Re: Weird Lear-Siegler ADM-3A board

On Wed, Jun 6, 2018 at 12:42 PM, Kyle Owen via cctalk wrote: > I have this development board with an NS405 on it. Checked through my docs > and don't seem to have anything for it. Would dumping the EPROM be of > interest? > >From the hand-written label on the EPROM, I suspect that it's not the

Re: CDC 6600 display character generation

On Wed, Jun 6, 2018 at 9:20 AM, Toby Thain via cctalk wrote: > On 2018-06-06 9:48 AM, Noel Chiappa via cctalk wrote: > > (BTW, the VT11 in DEC's GT40 used bit maps for its built-in character > geneator, > > and the hardware did tiny raster zones to display them!) > > As does the PDP-1 (point

Re: Weird Lear-Siegler ADM-3A board

On Tue, Jun 5, 2018 at 7:38 PM, Jon Elson wrote: > I wrote a disassembler for the NS405/NS455 in Pascal on my CP/M system, in > 1985. > If this code would be of any use, I can let you have it. I'm guessing > this was written for the UCSD Pascal system as run under CP/M. I have no > idea how

Re: Parts help - need flight SRAMs

On Tue, Jun 5, 2018 at 8:47 AM, Tapley, Mark via cctalk < cctalk@classiccmp.org> wrote: > I have a need at work for an unusual SRAM chip (related to the New > Horizons mission). > if you have a source or supply of these parts: > Part #=5962H9954103QXC > That's not a chip, it's a

Re: RC25 (was Re: Modifying microcode)

On Tue, Jun 5, 2018 at 12:53 PM, Robert Armstrong via cctalk < cctalk@classiccmp.org> wrote: > AFAIK the LESI ("Low End Storage Interconnect") protocol is not > documented anywhere, unlike SDI or MASSBUS which are. If it is, I've never > found it. I have several UNIBUS KLESI boards and I've

Re: Modifying microcode

On Fri, Jun 1, 2018 at 11:08 AM, Robert Armstrong wrote: > >Eric Smith wrote: > > >The control stores of the 11/785, 8600, and 8650 were entirely WCS. > > > >All other VAXen had (relatively) large ROM control store and tiny WCS or > >patch store. > > You forgot the 11/730 and 725. The KA730

Re: M6809E/63C09E databus behavior question

On Thu, May 31, 2018 at 10:48 PM, Jim Brain via cctalk < cctalk@classiccmp.org> wrote: > I agree this is very specific, but I thought perhaps someone could help. > > As I look at the '09 datasheets, I can't tell when the data lines become > valid on a write cycle. > In the MC68x09E datasheet,

Re: Hams and old computer stuff (Re: old DEC stuff)

On Thu, May 31, 2018 at 8:13 AM, Jon Tabor via cctalk wrote: > A bit unrelated, and I'm fairly new to this list, but interesting to see > so many ham radio operators pop up. > Boat anchors have always been popular with hams!

Re: Modifying microcode

On Wed, May 30, 2018, 20:26 Jon Elson via cctalk wrote: > The early 780 had most microcode in ROM, and had a small > writable control store for special OS-required options and > patches. Later machines had more WCS, but I think they > still had some non-writable control store. > The control

Re: Modifying microcode

On Wed, May 30, 2018 at 10:48 AM, Paul Koning via cctalk < cctalk@classiccmp.org> wrote: > Didn't the 780 get its microcode loaded by the console LSI-11? Only the small microcode patch store was loaded. Most of the 11/780 microcode was in bipolar PROMs. The later 11/785 had all of the microcode

Re: Weird Lear-Siegler ADM-3A board

On Fri, May 25, 2018 at 3:30 PM, Adrian Graham via cctalk < cctalk@classiccmp.org> wrote: > Wow, good spot! This one isn’t badged but we just assumed it had fallen > off. Just as I’m typing this he’s messaged me to say it’s actually the > ADM-3A ‘10th Anniversary edition’. The manual is on

Re: Weird Lear-Siegler ADM-3A board

On Fri, May 25, 2018 at 1:58 PM, Adrian Graham via cctalk < cctalk@classiccmp.org> wrote: > Hi folks, > > A friend of mine has said ADM-3A and is baffled by the tiny board it > contains, not the usual ‘covering entire base’ discrete logic board they > normally have. Centre of this board is the

Re: Weird Lear-Siegler ADM-3A board

On Sun, May 27, 2018 at 3:10 PM, Noel Chiappa via cctalk < cctalk@classiccmp.org> wrote: > I decided I'd do an article about the Term-Mite for the CHWiki; I found > Ciarcia's long article about the Term-Mite (in his book, which Google books > has); it talks throughout the article about the NS455

Re: HP Series 9000 early 1980’s computer hardware

On Thu, May 17, 2018, 17:57 Ed Sharpe via cctalk wrote: > Is HP UX that it runs similar to what is on the HP INTEGRAL ? > No, the fake-Unix-on-HP-Sun-OS HP-UX was only on the 9000/500 series. All the other HP-UX versions are "normal".

Re: Unknown CDC unit , looks like a drum memory ?

On Thu, May 17, 2018 at 12:47 PM, Fred Cisin via cctalk < cctalk@classiccmp.org> wrote: > If your email program is crapping, it is not the responsibility of > everybody else to "adjust" their mail readers to filter out the crap. > This group has been remarkably tolerant of NON-ASCII content. > I

Re: Intel 3000 series

On Fri, May 4, 2018, 20:39 allison via cctalk wrote: > On 05/04/2018 09:16 PM, dwight via cctalk wrote: > > I'm not sure how much good a 2900 assembler would be for a 3000 series > part. The 2900 has an address controller more like a typical micro > computer, while the

Re: Intel 3000 series

On Fri, May 4, 2018 at 2:10 PM, Kyle Owen wrote: > I assume it's one of these? http://www.bitsavers.org/bits/AMD/AM29/ > Any tips on how to get it running in SimH or the like? I don't see any text > file describing the system or format. > Should be in there somewhere. The

Re: Intel 3000 series

On Fri, May 4, 2018 at 8:49 AM, Kyle Owen via cctalk wrote: > Does anyone have any software for developing for the Intel 3000 series? I > bought some parts on eBay and am contemplating a bit-slice PDP-8 or DG Nova > for fun. > > Bitsavers has some 3000 series manuals, but

Re: TRS-80 Fragmentation

On Thu, Apr 26, 2018, 15:59 Bill Gunshannon via cctalk < cctalk@classiccmp.org> wrote: > I believe the Z-80 was subordinate to the M68K. In high-level conceptual term, maybe, depending on the software. In term of the actual capabilities of the hardware, the Z80 was firmly in control of

Re: Rick Dickinson, ZX Spectrum designer, RIP

On Thu, Apr 26, 2018 at 3:11 PM, Fred Cisin via cctalk < cctalk@classiccmp.org> wrote: > On Thu, 26 Apr 2018, Eric Smith via cctalk wrote: > >> Those Microdrives were such a Cheese design. >> > > The American Cheese Society (industry association) would probabl

Re: Rick Dickinson, ZX Spectrum designer, RIP

On Thu, Apr 26, 2018 at 3:03 PM, Fred Cisin via cctalk < cctalk@classiccmp.org> wrote: > Apple][ was $1298, and discounts were very rare. > TRS-80 at $599 was less than half the price. > Pet at $795 was barely more than half the price. > By connecting a CCTV monitor, I got my TRS80 new for $399.

Re: Rick Dickinson, ZX Spectrum designer, RIP

On Thu, Apr 26, 2018 at 2:37 PM, Liam Proven via cctalk < cctalk@classiccmp.org> wrote: > The QL was a weird machine. It predated the Mac by a matter of weeks and in > crude spec terms was comparable -- 128 kB RAM, 68008 vs 68000, 2 x 100 kB > Microdrives versus 1 x 400 kB floppy. The QL did

new disassembler vs IDA (was Re: 8085 Dissasembly?)

On Wed, Apr 18, 2018 at 8:17 PM, Mark J. Blair via cctech < cct...@classiccmp.org> wrote: > Some of the future reverse engineering projects I have on my to-do list > involve the CDP1802 processor, which IDA presently doesn't support. When I > get to them I'll have to decide whether to use

Re: Intel HEX formats

On Thu, Apr 19, 2018 at 1:45 PM, Dennis Boone via cctalk < cctalk@classiccmp.org> wrote: > > Based on what I find in format83.c, this shouldn't be too much > > trouble, but I really want to know what "Intel HEX 83" is supposed to > > mean. > > The easily findable specification document for

Re: Speed now & then

On Tue, Apr 17, 2018 at 8:18 PM, Fred Cisin via cctalk < cctalk@classiccmp.org> wrote: > thousands of movies and TV episodes will fit on a 2TB drive. > I am anxiously awaiting higher capacity thin 2.5" SATA. > You can get an 8TB drive in 2.5" form factor, but it doesn't contain spinning rust,

Re: 8085 Dissasembly?

On Tue, Apr 17, 2018 at 9:12 AM, allison via cctalk wrote: > Looked at 8086 and decided it was a 8080 with a bag on the side. > It was and still is irrational. > With the 386 architecture (32-bit), they actually cleaned it up quite a bit. I won't go nearly so far as to

Re: 8085 Dissasembly?

On Mon, Apr 16, 2018 at 7:29 PM, Chuck Guzis via cctalk < cctalk@classiccmp.org> wrote: > Disassembly is never lots of fun, > Some of us might disagree. But then, some of us might be masochists.

Re: motorola's chip page

On Mon, Apr 16, 2018, 06:35 David Griffith via cctalk wrote: > > Does anyone know where Motorola's current production chips are described? > http://www.motorola.com/General/prodport.html only partially works and > search is entirely broken because

Re: Speed now & then (Space and time?)

On Wed, Apr 11, 2018 at 6:04 PM, ben wrote: > On 4/11/2018 5:21 PM, Eric Smith wrote: > >> On Wed, Apr 11, 2018 at 3:48 PM, ben via cctalk > > wrote: >> >> The FREE fpga development software is only under windows.

Re: Speed now & then (Space and time?)

On Wed, Apr 11, 2018 at 3:48 PM, ben via cctalk wrote: > The FREE fpga development software is only under windows. > Xilinx and Altera (now Intel) FPGA development software, including the "free" editions, have run under Linux for many years now. I routinely use them on

5.25- inch alignment disk needed

I find myself in need of a 5.25-inch alignment disk. A few years ago someone mentioned a source for those, but I can't seem to find it. Is there still a source, or does anyone have one they'd be willing to sell? I could use an 8-inch alignment disk also, but don't need that as urgently.

Re: CXY08 and DELQA compatible with 2.11bsd?

On Fri, Mar 30, 2018 at 1:08 PM, Glen Slick via cctalk < cctalk@classiccmp.org> wrote: > Are there any hardware differences between the M7516 non-turbo and the > M7516-YM turbo versions of the DELQA, or only firmware differences? > Can you convert a non-turbo version into a turbo version just be

Re: PATA hard disks, anyone?

On Tue, Mar 27, 2018 at 10:19 AM, Ethan via cctalk wrote: > and well... let's just say that "newer" used disks with 4 years on them > aren't very reliable. > If anyone wants some Seagate ST3000DM001 drives (3TB SATA), I've got extras! :-(

Re: LSI11 CPU Microm

On Sat, Mar 24, 2018 at 1:31 PM, Douglas Taylor via cctalk < cctalk@classiccmp.org> wrote: > I was trying to put together a minimal PDP-11/03 using a quad width M7264 > CPU and got nothing, no ODT prompt. I'm not sure the board is working. > [...] > Quoting the page; "Using a logic analyser

Re: R.I.P. Robert T. "Doc" Suding

http://m.legacy.com/obituaries/denverpost/obituary.aspx?n=robert-suding=187748166

R.I.P. Robert T. "Doc" Suding

I just learned from the April 2018 issue of QST that Robert T. "Doc" Suding, W0LMD, has died. Suding cofounded and was chief design engineer of The Digital Group, an early microcomputer company in Denver (1974-1979).

Re: FS: Early Revision Commodore 64 computers

On Mon, Mar 19, 2018 at 12:55 AM, Sellam Ismail via cctalk < cctalk@classiccmp.org> wrote: > In the continuing saga of sorting through a big batch of Commodore stuff > from my collection, I've listed 6 different early revision Commodore 64 > computers for sale. > What?! Don't tell me you've

Re: XT/370 microcode

On Mon, Mar 12, 2018 at 10:54 AM, emanuel stiebler via cctalk < cctalk@classiccmp.org> wrote: > On 2018-03-12 15:49, Eric Smith via cctalk wrote: > > As the most obvious example of the impedance mismatch between 370 > > architecture and 68000 microarchitecture, the 68000

Re: XT/370 microcode

As the most obvious example of the impedance mismatch between 370 architecture and 68000 microarchitecture, the 68000 is hardwired to have eight each data and address registers, not sixteen GPRs, and microcode can't easily paper over that. Similarly, the 8087 microarchitecture has hardwired

Re: XT/370 microcode

On Mon, Mar 12, 2018, 05:13 Dave Wade via cctalk wrote: > . Wikipedia says there were/are > 2x68000 CPU's.. > One Motorola chip was the custom one, the other was normal (as indicated by mask code). There was also an Intel math co, presumably derived from 8087. I used to

Re: WTB Intel 7110 Bubble Memory Subsystem or Chipset

On Fri, Feb 23, 2018 at 10:23 AM, Jon Elson via cctalk < cctalk@classiccmp.org> wrote: > The original bubble memories were sort of dead end, but applying more > advanced semiconductor lithography to them, going to vertical Bloch-line > memory architecture, and such could have given them a lot

Re: WTB Intel 7110 Bubble Memory Subsystem or Chipset

On Thu, Feb 22, 2018 at 3:39 PM, Mark J. Blair via cctalk < cctalk@classiccmp.org> wrote: > > I've seen those instructions. As I understand it, I may need to do that to > restore a module to operation if it's lost its seed. But if that has > happened to either of the two modules in my firmware

Re: WTB Intel 7110 Bubble Memory Subsystem or Chipset

On Thu, Feb 22, 2018 at 2:28 PM, Mark J. Blair via cctalk < cctalk@classiccmp.org> wrote: > Is my understanding correct that removing the entire 7110 module as a unit > (whether socketed or soldered in) should be somewhat safe, but any attempt > to disassemble the module would likely disturb the

Re: WTB Intel 7110 Bubble Memory Subsystem or Chipset

On Thu, Feb 22, 2018 at 2:23 PM, dwight via cctalk wrote: > Do not remove the chip from the bias magnets. All will be lost if you do. > That's true, but AFAIK all commercially produced bubble memory devices, including Intel (7110 1Mbit, 7114 4Mbit) and TI, the bias

Re: HP 9816 CP/M-68K

On Mon, Feb 12, 2018 at 3:56 PM, js--- via cctalk wrote: > That's really "slick," Glen.If it's not too burdensome to give a brief > answer, how would you keep track of the time, or know how long feeding a > byte at a time took? > On an original PC or XT (without

Re: HP 9816 CP/M-68K

On Mon, Feb 12, 2018 at 1:23 PM, Fred Cisin via cctalk < cctalk@classiccmp.org> wrote: > Reading or writing multiple sized sectors can be done with multiple passes. > But, I don't know how to FORMAT a track with multiple sector sizes with > NEC 765 type controller. Not as hard with WD style

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