Sharp MZ

I see. Remind me of a weird behavior with Unicard I have. When powering on MZ-700, I enter the monitor prompt immediately so I need to press RESET in the rear to start the IPL loader. I suspect Unicard has the same issue as your ARM processor not to be fast enough but is less smart as yours .

MZ-700 80c: viewtopic.php?f=3&t=6&p=1104#p1104

MZ-700 PCB: Z80 + ZPU + RFS ? what about the genuine ROM?

At least it works with mz800emu from Chaky :

So if I change the number of displayed character lines from 25 to 19 (removing 6 lines), I get a stable image. Above 19, I get an unstable image.

What I discovered: 1) Genuine MZ-700: - /HSY[NC] starts the next line. - /HBL[AN]K goes LOW 9µs BEFORE /HSY going LOW, and HIGH AFTER 28µs. - BL[A]NK (connected to Z80 /WAIT ) goes HIGH 2µs BEFORE /HBLK going LOW, and LOW AFTER 26µs. - /[V]SYN[C] starts the next frame. - /VBL[AN]K goes LOW 4ms BEFOR...

The most important thing is it works on the real machine. It does work on mine. I will try to understand why it fails on the emulator. And thank you for your efforts and your source!

I tried two ways through my Unicard. VGA output from Unicard: the timings is totally off. Just plain characters. It looks like the VGA output of Unicard is a no-go for games/demos using display precise timings. SCART output from MZ-700: there is a rough mix of characters at the first lines, mostly l...

Et sinon, je vois un début prometteur sur ta photo puis ça se gâte à la deuxième ou troisième ligne de caractères. The timings appear a little off after several raster updates so the issue is probably the length in cycles of your raster code which is two close to the end of the raster and makes the ...

The original emulator doesn't emulate correctly the BLNK as I already told on an earlier post. |/HBLNK| = 64.05603 µs - 36.088 µs = 27.96803 µs -- PHIOx|/HBLNK|--> 99,19910640625‬ cycles |BLNK| = |/HBLNK| - 2.16508 µs = 25.80295 µs -- PHIOx|BLNK|--> 91,51983828125 cycles The emulator does |/HBLNK| =...

MooZ, serais-tu français ou francophile ? les noms de tes fichiers de capture d'écran sont... en français.