[cctalk] Altair 8800 question

I have a reproduction of the metal nameplate strip that looks very close to the original if you want one. $10 plus shipping. Mike D

[cctalk] Re: Current Loop Schematics

If it’s specifically to interface to a model 33 Teletype, here’s a design that works well and is pretty simple. https://altairclone.com/teletype.html Mike

Re: 8" disk drive questions...

Here’s a demo video of a Pertec 5.25” drive that has dual index sensors so you can simply flip a standard disk over and use both sides: https://www.youtube.com/watch?v=8UCcONLTsuQ&t=32s Mike

Re: Mystery 1702A(?) EPROM Programmer

It might be the Mikra-D MD-2040 1702 programmer. Similar to the MD-2044 on my website but a parallel data interface (e.g., manual switches and lights) instead of a serial RS-232 interface. The 2040 is briefly mentioned in the .pdf file here: https://deramp.com/downloads/eprom_p...kra-d/md-2044/

Re: CWVG

I can archive your disk content if you end up needing some assistance. I have a few Vector Graphic machines with 100tpi Micropolis and Tandon 100-4M drives as well as Mod-I drives at 48tpi. I also have utilities to archive and recreate disks on these drives by exchanging the disk image with a P

Re: michael Holley?

...and SWTPC.ORG is gone again. Mike

Re: WTB: CompuPro / Godbout RAM 17

Were you the winner of the eBay auction? It went for a very reasonable price. It was very difficult for me to not bid on it - those are great boards for use with early S100 systems :) Mike

Re: WTB: CompuPro / Godbout RAM 17

I assume you saw the RAM 17 on eBay right now? Mike

Re: Floppy pressure pad replacement?

I’ve got some adhesive backed industrial felt that I punch with a leather punch. I’ve replaced many of those pads on 8” and 5.25” drives and the felt pad works well. Shoot me an email and I can send you a few pads if you need. Mike

Re: michael Holley?

Sorry, I did not see your post that there was no concern of losing Michael’s SWTPC content. I simply did not want to see more great material disappear from the internet as our peers age and become unable to maintain their web presence. I’ve seen that happen over and over now. I’ll remove my mir

Re: michael Holley?

I archived the entire website in the summer of 2019, shortly before it went offline in the Fall of 2019. When it became clear that SWTPC.COM was not coming back on line, I chose to host the content at https://deramp.com/swtpc.com/ so hobbyists could still have access to the excellent material M

Re: windows program to read papertape from reader through serial port

I’ve used Teraterm to receive and save binary paper tapes and ASCII paper tapes to files using the log function without any problem. When you say receive “into an ASCII file,” what is the ASCII requirement you’re trying to satisfy? What is on the tape - text or binary data? Mike

SWTPC 6800, FLEX and Percom Floppy

Now that I have my SWTPC 6800 loading and saving programs with paper tape, cassette, and floppy disk (using the Percom LFD-400 controller and their MiniDOS and MPX “operating systems”), the next logical step is getting FLEX up and running. Unfortunately, I only have the Percom floppy controller

Re: Parasitic Engineering Altair Clock Fix Kit...

I scanned my Parasitic clock mod documents and put them at the link below. https://deramp.com/downloads/altair/hardware/altair_8800_computer/Parasitic%20Clock%20Mod.pdf Mike

Re: Parasitic Engineering Altair Clock Fix Kit...

I scanned my Parasitic clock mod documents and put them at the link below. https://deramp.com/downloads/altair/hardware/altair_8800_computer/Parasitic%20Clock%20Mod.pdf Mike On Thursday, February 20, 2020, 09:29:09 PM CST, Mike Douglas wrote: I have an original paper manual for it.

Re: Parasitic Engineering Altair Clock Fix Kit...

I have an original paper manual for it. I’ll try to get it scanned tomorrow. Mike

Re: SWTPC 6800 and Percom Floppy Controller

I have typed in the assembly source for couple of the missing utilities for which I was looking (there are a few listings in the LFD-400 manual), so I now have a pretty complete and useful Percom disk system for the SWTPC 6800. I also wrote FLOP2PC and PC2FLOP utilities to archive a disk to a PC

Re: SWTPC 6800 and Percom Floppy Controller

I’ve been able to complete the system running under the MiniDisk+ PROMs and added several programs like BASIC and an assembler to the disk. It all works together, but operations don’t integrate with each other very well. With much thanks to Bill Sudbrink, I also obtained the source to Percom’s M

Re: SWTPC 6800 and Percom Floppy Controller

Greg, Thanks for the response. The article you reference is also the one bit of documentation I was able to find. It's been a big help. I have been in contact with Bob and recently picked up one of his RAM/EPROM boards to use while I get the system restored. Mike On Wednesday, January 8,

SWTPC 6800 and Percom Floppy Controller

I’m restoring a SWTPC 6800 that includes the Percom LFD-400 floppy controller. This controller goes on the SS-50 bus instead of the SS-30 bus where the SWTPC controllers installed. The standard Percom MiniDOS PROM is installed, and the other two PROM sockets have a third party extension called “