Re: 5 1/4 diskettes available
TeoZ via cctalk writes: > At least shipping is cheap. > > Never seen a 4 pack before. I still have tons of green 5.25" DD disks > I picked up bulk when I got into 8 bit computers in the early > 2000's. Duplicators were dumping them so cheap back then, wish I would > have snagged more of the 3.5" DD back then. About two years ago, a seller on eBay was dumping a large quantity of DSQD (certified 96tpi double density) diskettes. I needed these for my 3B2, so I bought up the entire stock. I still wish I could find more! [As a side note: Good quality DSDD should work fine, but in my personal experience, anything other than top-top-top quality DSDD has trouble] -Seth -- Seth Morabito Poulsbo, WA, USA w...@loomcom.com
Re: KL10-A/KL10-B differences
On Thu, Jul 11, 2019, 12:31 Noel Chiappa via cctalk wrote: > it's also possible that > since the -PA to -PV involved a faster clock, I wonder if some backplane > lines turned into twisted pair, or coax? PA used 25 MHz (40 ns cycle). PV and PW used 33 MHz (33.3 ns cycle). I don't think PA to PV required any signals that were previously single-ended to change to twisted pair, or from twisted pair to coax.
Re: 5 1/4 diskettes available
>They confirmed my order. Fingers crossed they actually ship them, and it >doesn't >turn into an argument about honoring transactions. Though probably, a higher >postage >cost would be fair. 88 floppies and covers will weigh a bit. (Should have >bought 100.) >4 Pack of 5.25" Floppy Diskettes with Sleeves >COM1147 22 $0.89$19.58 >Subtotal: $19.58 >Shipping & Handling: $6.95 >Tax: $0.00 >Order Total:$26.53 They DID ship them. Just received notice of shipment. You know, the postage from Garland, Texas to LA, CA for a box of 88 floppies would have been more than $6.95. How much more, I don't know. Could they have made a loss on that transaction, hence the price bump? > That's not the same BG Micro we bought stuff from in the > early 80's, is it? > bill >The one with the yellow photocopied catalog? That's the same one. >The owner/founder passed away a year or two ago and I believe his daughter is >running it now. >Will Can anyone estimate the likely US postage for that package? Please let me know. If BG Micro are badly out on that transaction, I'll contact them and make it up to them. Would not if it was some big corp, but BG Micro are clearly honest. Such a rarity. Funny, I was thinking of Diogenes and his lantern just the other day. https://en.wikipedia.org/wiki/Diogenes Guy
Re: 16-bit ISA tape controllers
On 7/12/19 4:25 AM, Electronics Plus via cctalk wrote: > These do not come available very often. Not affiliated with seller, etc. > > > > WTS EVEREX SYSTEMS PCT04, REF, qty 5, CALL, TAPE CONTROLLER 16 BIT ISA > > > Sajjad Mukhi > Sales/purchasing > FML Computers Inc > Phone: 407-637-2922 Toll: 407-637-2922 > Fax: 407-362-7826 Cell: 407-718-8778 > mu...@fml-computers.com I believe that these are the controller for the Everex "Streaming Tape" QIC-36 interface drive: http://www.bitsavers.org/pdf/everex/evtape/MAN-00136-42_Excel_Installation_V4.2_Aug87.pdf --Chuck
Re: RALGOL - A PDP8 ALGOL 60
Thanks for that link Charles and also thanks to Mark Kahrs for obituary on Roger Abbott. I started out on PDP-8 in 1968 which was the first time I had hands on access to a computer at UofCalgary. Would have loved to have had access to one when I did my MSc in neurophysiology in 1975 but obviously Oxford in 1972 had much better funding than Uof0 (University of Ottawa). Roger Abbott had a PDP-8 to acquire data from his insect muscle preparations and noticed that 1972 Journal of Physiology papers no longer behind a paywall when was looking what type of research he was doing. Uof0 was still using rotating smoked drum cylinders to record muscle twitches in some labs and the lab I was in had a high speed oscilloscope camera which one could use to shoot long strips of neuron spike activigy from a mouse cerebellar culture. A technician was available to measure the time intervals between spikes and that's how I was supposed to do my project to look for connections between simultaneously recorded cells in the cultures. My request for a computer was denied and I was given $200 to build an electronic device to time the spikes and send them to the Uof0 360 mainframe where my FORTRAN code generated cross-correlograms and other neat graphs on a line printer http://drgimbarzevsky.com/Computers/UofOTerminal/TerminalCircuitBoards1.html Despite comments that I seemed to be working on a graduate degree in electrical engineering rather than neurophysiology, what I learned doing large scale TTL state-machine devices was invaluable when I moved to Vancouver and worked at UBC Pharmacology where lab computers were the norm and did my last bit of PDP-8 programming on a PDP-12 to speed up gathering data from a mouse diaphragm preparation which was easily done by rewriting the whole thing in PDP-8 and Link-8 assembler. The researcher whose machine it was used FOCAL for everything which made for horrendously slow data analysis. That done, I finally got to play on what I still view as one of the best computers ever made, the PDP-11. Fortunately at UBC there were a lot of researchers who mixed writing code and building their own hardware with doing their electrophysiologic experiments. That was a neat time when dicussions we'd have were whether a particular bit of data acquisition was to be done with optimized assembler code vs building our own dedicated board which would plug into Unibus on 11/34. I liked the latter approach but it was easier to debug PDP-11 ASM than chasing down bugs on a custom interface board having to spend time writing custom diagnostics to see if things were really working as designed. Have an old Algol book around from early 1970's and remember reading it then but liked FORTRAN more but most of my code was FORTRAN calling PDP-11 ASM functions on a PDP-11. All my PDP-8 programs from early 1970's are on paper tape and have never been transferred to other media. Algol 60 looks interesting enough to use given compact code and neat architecture that will try running it on PDP-8 simulator someday. Problem with simulators is that almost all of PDP-8 and PDP-11 code I wrote was to interface to A/D's and D/A's or parallel ports to run experiments. Once got a C64, wrote graphing code in C64 Basic and photographed my TV which was way faster than writing code in PDP-11 ASM to display graphs and data on oscilloscope screen from D/A's. Got into VB once PC's were cheaper than Macs and notice there's a lot of VB5 and VB6 code on Roger Abbott's final code. VB6 is something I still use and once I get my VB6 code running under Wine, windoze will be a distant memory. Was neat to see where other physiologists had been in early 1970's where it seemed I spend more time building the tools I needed to get the data I wanted than to do the experiments. Boris Gimbarzevsky I played around with this algol 60 compiler for the PDP8 and succeeded in getting it to run. I have not found any other notes, so I thought that I would give a leg up to the next one that wants to work on it. -chuck This ALGOL 60 implementation for the PDP8 was written by Roger H. Abbott while he was at Oxford. The bits are here: http://www.bitsavers.org/bits/DEC/pdp8/papertapeImages/russ.ucs.indiana.edu/Langs/Algol/ A copy of the manual here: https://archive.org/details/hack42_ROG_ALGOL_Compiler A paper here: http://pdp8.de/download/RogAlgol.pdf Mr. Abbotts business is here: http://www.angelfire.com/biz/rhaminisys/index.html The website or the host is a bit sketchy. The business is probably defunct. I found a link that said Mr. Abbott died in the early 2000. The system is two parts: the compiler and the runtime. This is all assuming the use of OS/8. To create the SV file for the compiler: .R ABSLDR *INTRUN.BN,ALGCOM.BN,COMOS8.BN$ .SAVE SYS:ALGCOM.SV .R ALGCOM.SV To create the SV file for the runtime system/loader: .R ABSLDR *FPP.BN,ALGRUN.BN,RUNOS8.BN .SAVE
16-bit ISA tape controllers
These do not come available very often. Not affiliated with seller, etc. WTS EVEREX SYSTEMS PCT04, REF, qty 5, CALL, TAPE CONTROLLER 16 BIT ISA Sajjad Mukhi Sales/purchasing FML Computers Inc Phone: 407-637-2922 Toll: 407-637-2922 Fax: 407-362-7826 Cell: 407-718-8778 mu...@fml-computers.com Cindy Croxton Electronics Plus 1613 Water Street Kerrville, TX 78028 830-370-3239 cell sa...@elecplus.com --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus
