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Tim HolyoakeIf 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. An MZ-80K and MZ-80A for less than £15! More info on the emulator here: <a href="https://z80.timholyoake.uk/the-pico-mz-80k/" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://z80.timholyoake.uk/the-pico-mz-80k/</a><a href="https://oldbytes.space/tags/RetroComputing" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#RetroComputing</a> <a href="https://oldbytes.space/tags/PicoMZ80K" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#PicoMZ80K</a> <a href="https://oldbytes.space/tags/PicoMZ80A" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#PicoMZ80A</a> <a href="https://oldbytes.space/tags/Sharp" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Sharp</a>

Tim HolyoakeNew from me: Calculating the date of Easter Sunday for all years from 1753 onwards ...<a href="https://z80.timholyoake.uk/happy-easter/" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://z80.timholyoake.uk/happy-easter/</a><a href="https://oldbytes.space/tags/RetroComputing" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#RetroComputing</a> <a href="https://oldbytes.space/tags/BASIC" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#BASIC</a> <a href="https://oldbytes.space/tags/SharpMZ80K" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#SharpMZ80K</a> <a href="https://oldbytes.space/tags/PicoMZ80K" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#PicoMZ80K</a> <a href="https://oldbytes.space/tags/Easter" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Easter</a>

Tim HolyoakeHere'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!<a href="https://oldbytes.space/tags/RetroComputing" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#RetroComputing</a> <a href="https://oldbytes.space/tags/PicoMZ80K" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#PicoMZ80K</a> <a href="https://oldbytes.space/tags/PicoMZ80A" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#PicoMZ80A</a>

Tim HolyoakeJust 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 ...<a href="https://oldbytes.space/tags/RetroComputing" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#RetroComputing</a> <a href="https://oldbytes.space/tags/Sharp" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#Sharp</a> <a href="https://oldbytes.space/tags/MZ80A" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#MZ80A</a> <a href="https://oldbytes.space/tags/MZ80K" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#MZ80K</a> <a href="https://oldbytes.space/tags/PicoMZ80K" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#PicoMZ80K</a>

Tim HolyoakePleasingly the <a href="https://mastodon.online/tags/PicoMZ80K" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#PicoMZ80K</a> also works with the <a href="https://mastodon.online/tags/RC2014" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#RC2014</a> 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 ...<a href="https://mastodon.online/tags/RetroComputing" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#RetroComputing</a> <a href="https://mastodon.online/tags/SharpMZ80K" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#SharpMZ80K</a>

Tim HolyoakePico MZ-80K release 1.2.0 is now available, including support for the <a href="https://mastodon.online/tags/RC2014" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#RC2014</a> RP2040 VGA Terminal Card.<a href="https://z80.timholyoake.uk/pico-mz-80k-and-the-rc2014-rp2040-vga-terminal-card/" rel="nofollow noopener noreferrer" translate="no" target="_blank">https://z80.timholyoake.uk/pico-mz-80k-and-the-rc2014-rp2040-vga-terminal-card/</a><a href="https://mastodon.online/tags/RetroComputing" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#RetroComputing</a> <a href="https://mastodon.online/tags/SharpMZ80K" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#SharpMZ80K</a> <a href="https://mastodon.online/tags/PicoMZ80K" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#PicoMZ80K</a> <a href="https://mastodon.online/tags/RaspberryPi" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#RaspberryPi</a>

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