What are the chances the BIOS might get an update in the future? I've pretty much managed to pinpoint the issue with Scorpion Timings.
Looks like it is almost working correctly when selecting the "ZX Original" mode, but the lower RAM bank being contended/slow. With "Scorpion" mode the screen seems to set up incorrectly.
\sprinter\LAST\BIOS\X_PLAN.txt from sprinter.zip (http://winglion.ru/sprinter/sp2000/sprinter.zip) also mentions this:
Код:
NOW
v Смеситель AY,Covox,Beeper
Блокиратор CTRL-ALT-DEL
? Включение прерываний от клавиш с удержанием INT-а
Запоминание состояния (CMOS-35h??)
1. Переключатель конфигураций (BYTE)
V bit0 - 1 - accelerator on; 0 - accelerator off
bit1 -
bit2 -
* bit3 - 1 - AY - ABC; 0 - AY - ACB
* bit4 - 1 - Covox+AY+Beeper; 0 - Only-Covox;
* bit5 - 1 - Pentagon timing; 0 - Scorpion timing
V bit6 - 1 - Fast-Spectrum; 0 - Real-Spectrum;
bit7 -
I guess the "Fast-Spectrum" mode would be what would come close to Scorpion timings (ZX Timings, but all RAM is "fast RAM").