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You must have missed the original context from my thread "Vintage Ironey", spelling error lovingly pointed out by mbbrutman. https://forum.vcfed.org/index.php?threads/vintage-ironey.1203659/ The previous iteration of forum software made my "older" iPad vintage, a.k.a. obsolete. With the...

Merry Christmas!!! I can log into the new forum using my vintage ipad! A Christmas miricle. Thanks guys, Len

So last night I tried to login to the "Vintage" computer forum, this site, using my "Vintage" iPad (IOS 9.3.5.) and the login button wont work.... It's funny how we are here to discuss anything about "Vintage" computers, yet unable to access the forum without using a modern computer. I guess...

Might anyone have any docs or know about this card? len

This was a link from a story posted on hack a day http://trochilidae.blogspot.com/2020/12/reverse-engineering-at-17v-and-200khz.html I laughed at the suprise over the 200khz two phase non overlapping clock. Those of use who cut our teeth on 8008's and 8080's are not suprised at all...

I have a xerox 820 mainboard that I am working on. The video output is designed for a ttl monitor. Can anyone recomend a suitable monitor that will work? Len

Hi, I am looking for edge connectors that fit flip chips. Dual row 18/36 pin 1.25" (3.18mm) spacing. I look on all the regular suspects DIgikey/Mouser/etc and can't find any good options. I don't need a backplane, just lose connectors. CHeers, len

A few years back I seem to remember a thread for a video format convertor. Does anyone know what happened to this project? len

Ran across this listing on ebay. Both machines booted with the floppy protection disks inserted and locked in the drives...

Can anyone point me to a data sheet for a tms4041 4k x 1 static ram? Tahnks Len

In case you missed this https://hackaday.com/2018/10/01/microsoft-releases-crown-jewels-from-1982/#more-327120

I enjoyed this blog. Many of us came from the days where we wrote SW for resource limited machines. Now it seems the goal is to consume every resource just because it's there. It brought to mind a posting where someone said nothing should be written in 'c'... Really? Why, because you cant...

What type of switch is this? Who makes them?

This weekend I successfully booted CP/M on my bench system! It was quite a long journey. It started almost exactly a year ago when I restored an Altair I acquired several decades ago. After restoring the Altair I got CP/M working on it using an FDC+. That wet my appetite, but using the...

I have a CPM machine running with two floppy drives on it currently. A teac FD-55GFR and a Tandon TM100 2A. I have the Teac strapped to run at 300RPM. Each drive can read and write its own floppies just fine. The disks can only be read from the drive they were written in. Question...

Might anyone know anything about the little pulse transformer on the Cromemco 8K bytesaver? Who made the transformer or specs? It's used in the step up inverter circuit for the programming voltage. It's listed as an XT8K on the parts list. I google and find no information. I'm repairing a...

Hi, Does anyone have the source code that contains the code in the book "The Programmers CP/M Handbook" by Andy Johnson-Laird? len

Hi, I'm trying to get msdos working on SIMH. I have the ibmpcxt emulator built and running. How do I get msdos up and running? I've used the pdp11 emulator to run RT11 and BSD 2.11, I found lots of info on the, but I'm not seeing anything for dos... :( CHeers, len

Hi, I'm looking for the Morrow Disk Jocky 1 CP/M disk images as referenced in this document on bitsavers: http://www.bitsavers.org/bits/Morrow/decision/floppy/_Morrow_Disk_Numbers.txt On bitsavers they have the 500 and above files. I'm looking for the "400.IMD" images. Can anyone point me...

Hi, Can anyone tell me if I can get a Compupro RAM16 working in an IMSAI? From the few links I can find it doesn't appear to be promising. I don't mind making modifications to the memory card. I just don't want to make mods to the IMSAI. What 64k cards work well on the Altair/IMSAI buss? len