Hi again,
After Daniel Vik told me he tested the behaviour of 16kB VRAM on V9938 (like on the SVI-738), I tried to implement it in openMSX as well. Daniel found that non-existing VRAM reads return simply 0xFF and writes are ignored (not mirrorred...).
So, I tried to run some normal MSX2 software on a machine with 16k VRAM and a V9938.
Did anyone ever test this on a real system? Maybe halfway during a SVI-738 upgrade?
What I see on openMSX is some mirroring effect (despite not having that implemented): part of the bottom screen is mirroring the top part. E.g., when trying the MSX2 bootup logo with 16k VRAM, I see part of this logo at the bottom after it stopped scrolling.
Do you guys have some test programs for these cases with known output?
E.g.: NYYRIKKI used to have a screen 5 picture viewer for the SVI-738. Anything more? And where can I download this nowadays?
I'll keep you updated if I find out more.
