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ajparent1/kb1gmx wrote: That's a good summary of CP/M usage, Allison. It mirrors my experience as well. Early on, CP/M computers with primiive software and floppy disks really slowed software

ajparent1/kb1gmx wrote: I agree with your reminiscing, Allison. I have an Atari 800 with 32-char screen; its NTSC video is fuzzy and painful to read. I had an Osborne O1, and its 5" 50-char CRT was

Lee, The old analog monitors were pushing hard at 80 chars but tended to be crisp at 64. The trade is that at 64 chars most editors and apps were easy to live with but less (Osborne at 50chars) it

ajparent1/kb1gmx wrote: A good summary, Allison. I too have a pile of vintage systems to look at, plus I've stared at the schematics of lots more. Learn from the experts! :-) One common thread is

There are two forms of CP/M experience: Small, slow and cramped typical of early floppies of 120 and 241K size. High performance using fast large media (hard disks, IDE, CF, SD). The bulk of CP/M

Not a fan of TMS9918, hard to get too. As I have a large collection of CP/M base systems... S100 several... (Altair, NorthStar, Compupro) AmproLB+ Kaypro 2 and also 4/84 DEC VT180 (z80 board +

Richard Cini wrote: I've used PLDs in other designs for clients. They certainly reduce the parts count, and are good for "get it out the door quick" projects. They're great for commercial products

I do like the VID design, but here are a few things I thought of: If you don’t have an aversion to using a PLD, a small GAL like a 16V8 might be useful for decoding and would still be

Hi Mark, Thanks for checking your stock.? I will let Lee contact you off line, since he's the one who stocks and kits the kits. I believe I can say "kits the kits"... both a verb and noun right??

Actually, I'm already doing a re-spin of the product, to make it more environmentally robust, use a better A-D converter (the one I'm using now has caused many problems), and fully isolate an RS-485

Actually, I'm already using the MAX7219, because it does save so much work and there are easily-available libraries to drive it.? The reason I liked the display I'm using is that it's the right size

Mark,?? Can your product handle an 85mm wide display?? Here's what is very popular and inexpensive on ebay.8 digit, bright blue display (unlike the hard to read red displays), with MAX7219 chip to

Hi Mark, They are definitely a cute display.? But they are just about the only kind of display that fits inside the Altoids tin.? Does your product need to be small?? Perhaps before the 1100 are

Mark Moulding wrote: Hi Mark, Aha! So THAT's where they all went! When we designed the badge, I ordered a couple hundred for the VCFMW show and follow-on orders. These were quickly gone; but when I

smmccown@... wrote: I bought them on ebay. No data sheet or manufacturer's name. It's marked 72R02PHIL, date code T9718. Lee Hart -- A designer knows he has achieved perfection not when there

Richard Cini wrote: Thanks Rich, Designing video was "hard" back in the 70s/80s, so there were lots of specialized controller chips for people eager to get something out the door quickly. The

Found this... https://retrocomputing.stackexchange.com/questions/7087/what-video-chips-video-generation-techniques-are-usable-for-the-z80 The 9958 is a weird DIP packaging so maybe the 9918. The

Hi Lee, Do you have a datasheet or part number for the replacement LED display?? I would like to read about it. Thanks, Steve

Lee, I probably caused the availability problem with the original display you were using.? I found that to be a really neat display, so I designed it into a specialized low-volume product I produce

I was thinking in the context of bang-for-buck more so than the Woz kind of challenge. Most video designs I’ve seen (post Don) use a CRTC like the 6845 or something close. I think they need too many