RC2014-Z80

Yeah, ZPGPRS (Z80PaGing/PageRegisterSelect) is TRUE/HIGH when the Z80 is the Master and Paging is

On Friday, 28 November 2025 at 07:21:37 UTC+8 Michelle Lawson wrote: 1. TPA starts at 0100h, but how

I don't entirely trust the scheduler for my website, and I don't want to stay up until

For CP/M, the widely used and distributed version of Microsoft BASIC is 5.21. Unfortunately, the

Oops. Simple bug propagated through the rest of the files and broke it all. Fixed now. Also uploaded

Run classic CP/M programs on modern Linux systems. Unlike traditional emulators that require disk

Oopd the github repository is https://github.com/avwohl/um80_and_friends On Thursday, November 27,

I have a background in compiler construction. I was interested in the late 1970s in making an

Ah, I see it now. I wasn't using the DMA as the buffer. That's the trick it looks like. On

Thanks Ed for the symbol and footprint. That will come in very handy. Yep, it is surprising that this

Thanks Ed. I've used DJNZ before, not sure why I overlooked that. On Fri, Nov 21, 2025 at 9:45 PM

I agree that for the MAX232, the recommended value is 1.0uF. For the MAX232A, it is 0.1uF. I just

Just a quick update: OPEN-FILE and READ-FILE are working, though they both need some improvements,

Excellent! So, it can run, run, run, while you cruise through the hamburger stand!!! On Thu, Nov 20,

I will at some point get the dual clock card and do this for real, but for now I can have the feel of

LOL it was :).. On Wed, Nov 19, 2025 at 12:58 PM Mark T <mark...@gmail.com> wrote: I hope

On 19/11/2025 17:32, Michelle Lawson wrote: > I don't know the backstory how the RC2014 came

Dave, I kinda figured that would be the case, but knew I wanted to err on the side of caution and ask

Gotcha. Figured I'd ask and not assume. Thanks On Monday, November 17, 2025 at 3:54:40 PM UTC-5

The MP/M operating system offers this functionality, but requires a hardware timer.

Fantastic. Just what I was looking for. That will be one of the first kits I order once I get the Pro

Yep, it's hard to find one that works well. I find it particularly frustrating, because I worked

I'm probably going to start with the LM323K since I have them already. If that works, then switch

Get well soon Spencer! On Friday, 14 November 2025 at 23:46:22 UTC+5 Michelle Lawson wrote: It will

That would be interesting to hear about for sure. Probably on retro-comp though. Greg On Friday,

If you don't have any luck here try over on vintage-radio.net vintage computers section. You'

On Thu, 2025-11-13 at 13:05 -0800, Pete Baker wrote: > It lives! Booted into CP/M, and I'm

Yes, as mentioned, in almost every case you need to know an absolute address *somewhere* that you can

22Disk, Teledisk if my memory is correct. Greg On Monday, November 10, 2025 at 5:22:09 PM UTC-8

Thanks Dave. I used to have a copy of this book, thanks for the link. I did a lot of Z80 programming