#picomz80k — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #picomz80k, aggregated by home.social.
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New from me: Fang, Claw and Knight's WEE FORTRAN
https://z80.timholyoake.uk/fang-claw-and-knights-wee-fortran/
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New from me: Monster Chase, Part 2
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If you want to play with my Pico MZ-80K/A emulator, this weekend is a good time to buy the hardware from Pimoroni as there's 50% of their VGA demo base and 25% off a Pico 2. A MZ-80K and MZ-80A for less than £15!
More info on the emulator here: https://z80.timholyoake.uk/the-pico-mz-80k/
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New from me: Calculating the date of Easter Sunday for all years from 1753 onwards ...
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Do you know when the next lunar umbral eclipse is?
The Pico MZ-80K running program 9 from Celestial #BASIC does!
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This is making me happy today - I've made good progress on listing and printing the contents of Sharp #BASIC programs using an authentic-looking font.
#PicoMZ80K #PicoMZ80A #RetroComputing
https://z80.timholyoake.uk/displaying-sharp-basic-programs-on-modern-computers/
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A little bit of progress today ... Keyboard handling is now mostly sorted. Next job is probably to look at the additional 0xE0nn addresses that the #MZ80A uses for various things, including reverse video and screen / VRAM scrolling.
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Here's an interesting "feature" of the MZ-80A monitor ROM. Depending on whether the screen is addressed by the monitor or 'poked' to from BASIC, some ASCII codes have a different effect.
It's most noticeable (at the moment) during emulator startup as the monitor is attempting to clear the screen by scrolling it downwards (Sharp ASCII 104). But my emulator assumes you are 'poking' 104 (0xCF) ... which happens to be a face in the Sharp display codes.
Should be easy enough to craft a fix, as I know where the program counter is when the vga display routines are called. I think!
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Just looking at how straightforward it would be to extend the Pico MZ-80K to emulate the MZ-80A as well.
Shouldn't be too difficult, and it could potentially run CP/M.
I've a feeling I'm just about to fall down a rabbit hole that I swore I wouldn't ...
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Pleasingly the #PicoMZ80K also works with the #RC2014 pico based VGA terminal with the addition of an external micro sd card reader and speaker. As I've used the ground on the expansion header for the sd card, I've borrowed a ground from the unused tx/rx pins for the speaker :)
Will be in my repo later once I've tidied the code up ...
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Taking a break away from the Pico MZ-80K emulator over December seems to have done wonders for my debugging brain. I think I've finally managed to properly sort the keyboard handling so that the F9 kludge is no longer necessary! Testing so far is encouraging ...
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Pico MZ-80K release 1.2.0 is now available, including support for the #RC2014 RP2040 VGA Terminal Card.
https://z80.timholyoake.uk/pico-mz-80k-and-the-rc2014-rp2040-vga-terminal-card/