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I managed to score an iPDS-100 (right here, in the marketplace!) and one of the things I'm looking for is an iPDS-120 multimodule adapter board. This would allow the use of bubble memory (which oddly enough I have, and have seemed to develop a bit of a fondness for). The multimodule board is...

The attached board is on its way from eBay. I just can't resist mystery items, even ones with blown capacitors. I'll take a stab at making it live again. My assumption is that it's some kind of 286 board, and the chip under the heatsink is an 80286. The pigtail cables goes to an 8088 socket on...

It's the last speech synthesizer on my list. I actually have everything I need to make one (including decent pictures of the pcboard of a real one) but my preference would be to have the original. If you have one you'd like to part with, please let me know. Scott

I'm trying to identify this, which I think is a ROM. The markings are F JAPAN 8164A-15L 9121 T66 Anybody know what it is? The socket seems to roughly match a nearby 27256, with the exceptions of pins 1 (VPP), 20 (!E), 26 (A13), and 27 (A14). Putting it in my programmer and trying to read it...

I've recently come into possession of a Vesta OEM-188. This is an interesting little single-board computer, with a write-up included in a few Radio Electronics Magazines back from 1987. The computer boots Forth natively and playing around in Forth is somewhat self-explanatory. However, there are...

The 8008 supports interrupts. You can raise an interrupt, where you'll get an acknowledgement and the opportunity to insert an arbitrary instruction, such as using a RST<n> to jump to a particular interrupt vector. Easy enough. The 8008 does not implement arbitrary push and pop, It only...

Casually looking for an Olivetti M20. Doesn't necessarily need to come with a monitor. There are a few in Italy right now on eBay, but I just went through that exercise only to have outbound customs bounce it back after a couple weeks to the seller as a "dangerous" package. So I'm unlikely to...

One of the first programs I remember using on the PC was "Friendlyware" and I distinctly remember the "Boss Key" that would bring up a spreadsheet when you hit F10. Wikipedia even mentions the boss key. However, I own Friendlyware Pc Introductory Set 1.1 and 2.0, and neither version seems to...

I'm looking for a particular DRAM board for the Heathkit H8. Representative picture from a recent eBay listing is attached. I've seen three listings on eBay that included this card lately, so certainly they're out there in the wild, but circumstances did not align for me to obtain any of them...

I bought a couple of these from eBay, as usual, without software. From wikipedia, To get it working would make an interesting project, an IBM 5150 with a couple of 286-class computers running inside it. However, the path to finding the software may be long and arduous. Alloy Computer Products...

I'm building a circuit based on the Yamaha V9958, very similar to the RC2014 V9958 board and similar to Sergey Kiselev's Omega computer. It more-or-less works except that there picture is jittery / flickery and occasionally appears to lose sync on my GBS-8200 scan converter. Putting the scope...

Thinking about a new project, and looking for a case for a heathkit H8. A dead or ”needs repair” H8 might also work, depending on the price. scott

The binary was found in a Unix Sys V distribution circa 1986, and I've seen references in a few manpages and even a PDF manual. Extracting strings from the binary I can see that it was compiled from "maze.c". But I can't find this particular maze.c anywhere. I have found other game source from...

The following two programs: int main() { int f = open("zork1.dat", O_RDONLY); unsigned short res; long len; int bread; char *b; b = malloc(1024); if (b==NULL) { printf("failed to malloc\n"); exit(-1); } printf("%X\n", f); bread = read(f...

I'm looking to add a BASIC interpreter to my Z8000 project. The Z8000 has an assembler and it has a C compiler. But that seems to be about it. I'm looking for something that would be relatively portable and easy to compile on an ancient (circa 1984) C compiler. Something that's more-or-less a...

Working on a few 8-bit ISA projects. The first is a Periscope Debugger board that I found on eBay. Basically, the software that goes with this manual: https://www.os2museum.com/files/docs/periscope/periscope-manual-m54.pdf. I realize it's probably a longshot. The second project is the "Trump...

Recently I made a few expansion cards for the Epson QX-10. These include a CompactFlash/IDE adapter, a Sound card, and a Speech card. Made a few youtube videos on them: https://www.youtube.com/watch?v=2mRP023T6nk https://www.youtube.com/watch?v=aCghL7qwAp8&t=910s Boards are up on eBay if...

https://www.ebay.com/itm/324824550238 I've been looking for one of those for a while ... but not at that price! Still, the pictures are pretty interesting.

Granted, it's been more than 30 years since I've used a coco, so I'm just a little bit rusty... I'm trying to program a CCC file into the Flash of a CocoSDC. I did the followiung: 10 CLEAR 200,&H3FFF ' RESERVE A 16K RAM BUFFER AT $4000 100 PRINT "DIAGS82" 110 LOADM "DIAG82.CCC",&H4000 120 KILL...

Spotted on ebay, https://www.ebay.com/itm/334149860221 looks like it might be a QX-16 monitor. I recall recently someone else (@DeltaDon?) had to convert a different monitor over, so wasn't sure if anyone here is actively looking for one. Scott