Adding Magnetic Bubble Memory to a vintage computer, an iPDS-100 Personal Development System
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- Опубліковано 1 чер 2024
- In this video, I take an iPDS-100 vintage computer circa 1982 and add Magnetic Bubble Memory to it. The iPDS-100 was manufactured in the early 1980s by Intel and was sold as a personal development system, featuring EPROM programming and emulation capabilities for 8051 and 8085 CPUs. This particular iPDS-100 has two 8085 CPUs in it, allowing you to run two programs concurrently on a split screen. This allowed you to not just program EPROMs and emulate processors, but also to run a variety of software such as editors, assemblers, compilers, etc. It ran an operating system called ISIS-II, and it also ran CP/M. My iPDS did not include the necessary iPDS-120 "multimodule adapter" necessary to plug the iSBX-251 Bubble Memory modules into it. So I built my own! It was a little difficult getting the dimensions exactly right, but I pulled it off and was able to install the replacement adapter and get my iPDS to use bubble memory and to boot from it. I also show how to blank check, program, and verify a 2532 EPROM. For more vintage computer projects, see www.smbaker.com/
- Наука та технологія
"Boot from bubble" has to be one of the coolest prompt ever :)
Very impressive! never heard of the iPDS-100 before, must have cost a lot back in the day XD
MRAM is also a decent option for those missing out on bubble memory technology - it functions similarly to bubble memory technology yet with magnetism to store data. I got a Zilog Z80 CPU to play with.
Another brilliant video, thank you, Dr Baker.
Wow, this is very impressive.
... спасибо, хорошая работа.
Back when mezzanine connectors had 0.1" pin spacing.. good times.
I was hoping to see DIR running in foreground while the EPROM was being programmed, but oh well, the video was great fun anyway.
An opportunity missed! I'll have to see if I can shoot a video next weekend. What I'd really like to do is run Conway's game of life on one CPU while burning an EPROM... (but then I'll have to code it up)
BTW: In its era, ISIS was a better OS than the CPM or DOS you could get. IIRC, ISIS had 6 file buffers normally so you could have up to 6 files open efficiently. The programming language for writing code, assuming you didn't do it in ASM, was a thing call PLM. The design of the PLM language had some problems with it but you could write code that worked using it. They also had fortran for it.
They had a system that worked like a batch file but not really. If your file took no arguments things were simple bit if it took arguments what they did was insert the argument into a new copy of your batch file.
I used there MDS system which I think cost a lot more and weighed too much to carry it.
android smartphone is amazing good job sir
I have one of these systems without pods and hope to get cp/m running on it some day.
Let me know how it works out, once you get it up and running!
I remember reading about bubble memory and being really curious. Thanks for satisfying that curiosity!
Fixing vintage arcade machine PCBs I can tell you it's more like 4 times out of 5 is it OK to substitute LS logic with HCT. And maybe 1 time out of 5 can you use HC (without the T). Sucks when your electronic component supplier doesn't have the part you want... (these old boards have timings that are... fragile. De-glitching capacitors are the norm... put in a chip with marginally different timings, bam! Machine stops working or does weird stuff)
Never heard of the iPDS-100, now I want one. With a Z80 and a 6502 pod if these exist (of course all the PROMmers you can get and the EPROM simulators). And I'll likely spend hours in that hex editor and EPROM simulator mode (although I do have a Centronics Printer Port EPROM simulator that I use a lot).
Hi, I saw your video and I fell in love with it. On Sunday I bought a trunk with thousands of components at a flea market, I understood that there was something good in the middle. in fact I managed to find different versions of the 8041, 8085, 8088, 8086, ram, rom, eeprom, plus hundreds of TTLs as well as thousands of transistors, capacitors, .... etc. I wanted to know if you could help me choose the best versions of components and build a computer from scratch. It has always been a passion of mine. I hope you can help me, thanks...