Re: PC-card (4)
Date: 2001-04-13 23:11:36

Hallo David,

> Remember: the 8237 will be clocked from the ISA bus, which runs at
> 8mhz! ;)

Yes, on a PC. Remember the project to let a C64 run at 2 MHz? You had to 
replace the DRAM with SRAM. And why? Otherwise you could not get around the 
timing of addressing the original DRAMs.
Using an original C64 means you're stuck to the 1 MHz cyclus. The 8237 
needs four cycli. I already did some research to find out if I at least 
could speed up a part of it but I found no holds to synchronize the 8237 
with the C64 at the right moment :(

This simply means the ISA-bus has to run at 1 MHz.

Groetjes, Ruud

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