Recent content by P-man

An off the shelf power supply, something you would need for any other electronic device you used anyway. Not really a barrier to entry. The fact it had both serial and keypad entry is a plus not a minus here. Your previous assertion was that the KIM-1 was only a development board like all the...

I would also like to point out that the Advert for the KIM-1 absolutely states that this is a 'complete microcomputer' - it was not sold or marketed as a development board. A development board for other CPU's are far more stripped back to the essentials for design engineers. The KIM-1 was an out...

Sure, i didn't know everything at the time i made the video, it was still new-ish to me :) Of the originally loaded chips on my KIM-1, 18th week of 1976 is the last dated device so it was likely put together in May 1976 at the earliest. Is it understood they started selling them in April 1976...

I made the second part of the video available here : Kim-100 Part 2 video

Well, I think MOS was planting the seed of microcomputing by engineering out all the mundane stuff you had to work out yourself on earlier systems. Things such as having microcode in rom for interfacing the keypad, the 7-seg LED displays, a cassette interface, serial interface (!), and routines...

hi all, Recently got hold of a pretty impressive example of a 70's homebrew computer system. The original owner got hold of a release model MOS KIM-1 and designed and built their own S-100 interface card, built an enclosure and keyboard, added ram card and serial terminal card to make for an...

hi all, as the title suggests - looking for one of these if you have one and can mail it, please let me know!

Excellent information thankyou. The rom has a blank label, so that's no help.. but please find a dumped ZIP attached here, plus photos :) Ok, so it looks like i need to find this System Support 1 PCB, there's space in the chassis right next to the existing drives so a Gotek 8" doohickey...

hi all, Recently picked up this seemingly unused TEI chassis containing a good group of entirely CompuPro cards installed in it, with two 5.25" drives. All cards are Godbout/Compupro branded. Looks like theres 256k of ram on 4x 64k SRAM cards, an Interfacer 1 a floppy controller, and the...

I have an STB multi-function card with ram and it has an unusual RTC chip - the SAF3019P.. I can't find any timer/setclock utilities for it, has anyone seen this before?

I would like this for an XT project, message sent!

You shouldn't put anything at C000 anyway, c800 is the safest universal location that will work from PC through x86 up to Pentiums. DiskOnChip modules *only* work between C800/D000/D800 to avoid conflicts.

Found this piece of paper for the above mentioned speed displays in an old case, useful for minuszerodegrees!

For anyone reading this in the future - after looking at the schematic and what it was doing in-circuit I figured a 2N3055 would work in its place, and indeed it does now work fine replacing the 171-1 transistors :)

Just to add that this morning I repaired the PSU by replacing the two bad 171-1 transistors (one had a B->C short, the other was leaking C->E). As the -12v transistor had shorted, I decided to also replace its ua723 regulator at the same time. I checked the state of some of the caps in the...