First post, by 8bitbubsy
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Are there any penalties on writing a byte to VRAM (0xA0000) on a 16-bit ISA graphics card, e.g. will the system have to do something like a 16-bit read, insert byte into word, then a 16-bit write? Or can the CPU write a byte directly to a 16-bit ISA device without conversion? Seems difficult to find out how it really works through googling.
386:
- CPU: 386DX-40 (128kB external L1 cache)
- RAM: 8MB (0 waitstates at 40MHz)
- VGA: Diamond SpeedSTAR VGA (ET4000AX 1MB ISA)
- Audio: SB Pro 2.0 + GUS 1MB
- ISA PS/2 mouse card + ISA USB card
- MS-DOS 6.22 + Win 3.1
- MR BIOS