Yes it does! I must have filled that empty resistor network socket with whatever I had laying around to take the photo, while waiting for parts to arrive. Good catch!
Hello, I've decided to put the design files for the PC-Retro into the public domain. The PC-Retro is a faithful reproduction of the original IBM 5150. My business MTM Scientific, Inc sold kits to build this motherboard starting in 2012. Over time it has become increasingly difficult to source...
Hello, I am working on a homebrew TTL stack computer design using 74LS series chips. I recently created a single board version of the computer with an integral 50 channel bus. My computer is clocked at 1 MHZ. I have made provision for a bus-out connector, anticipating that I might want to...
This book is great! I recently wanted to add serial and parallel ports to my homebrew stack computer and the no-nonsense "here's how to do it" explanations had me up and running in no time using the venerable 8255 and 8251 IC's.
Of interest regards this topic is the AT BIOS Kit written in C by Annabooks. The files for the AT are floating around out there... There is a similar BIOS for the PC, but I have never been able to locate those files.
https://archive.org/details/ATBIOS_Kit_Nov89
Here is a programming language checklist for people writing a new computer language. It's both funny and true...
https://www.mcmillen.dev/language_checklist.html
Here is an excerpt from the header:
You appear to be advocating a new:
[ ] functional [ ] imperative [ ] object-oriented [ ]...
Hi, I have been reading about, and playing with a C Language Interpreter called "RUN/C Professional" as was offered by Lifeboat Associates in the 1980's, and as reviewed here:
https://www.softwarepreservation.org/projects/interactive_c/bib/Unger-1987.pdf
I was able to find a disk image of the...
Hi, It's been 3 months since I posted this WTB. Still looking! I am using my ACER 710 to write an assembler for my homebuilt LALU stack computer, and also cruising TELNET, thanks to Brutman's MTCP. A vintage ACER keyboard would be grand. Thanks. Michael
Hi, I am watching for an "ACER" badged Keyboard that has the 5 Pin large DIN connector with PC/XT output (Not AT). This would be before a "Windows" key was on the layout. Some of these keyboards have a slide switch on the underside to select PC/XT or AT. This is for an ACER 710, an IBM PC clone...
This is an IBM 5155 PC Luggable that is for sale and available for pickup only at the Monroe County Hamfest on Sunday, June 18th beginning at 7:30 AM. I have had this machine for over 20 years and don't remember where I got it. First attempt at boot showed a memory check that stalled, and 2nd...
Hi, I bought a batch of PROMDISK IV cards on EBAY back in 2016 and spent way too much time learning how to configure them. Here is a link to a zip file containing the information related to my adventures back then, including programming software. These cards are nice if you are working on bare...
Hi. This is a great discussion. Would someone be able to point to a resources that details how the EAE works? I have seen the circuit schematics, but would appreciate a higher level system level explanation. Thanks!
Thanks everyone for those great replies! I especially appreciate the links to other information, and the historical context.
This same topic of Predication came up at another forum, and I pointed to the discussion above, here at the VCF.
https://anycpu.org/forum/viewtopic.php?f=3&t=969
BTW...