Posted By
gerliczer
on 2014-07-28
03:36:29
|  Re: Árok 2014
Hi MMS,
Messenger of the masters (siz) already said how it works. They stream the - of course - pre-converted video from a Compact Flash card and map it into expansion ROM space. The original hardware runs a "simple" displaying programme that selects the - let's assume - bitmap and colour matrices into the given expansion ROM area and probably signals vertical retrace for the extension to flip screen buffers.
Edit: I forgot this. There is no DMA, at least in the sense you seem to imply, in the 264 series machines. You may build one; there are free pins on the expansion port after all, but you need to do hardware modifications in the computer. Or you may try, with insane trickery, emulate one using the BA pin.
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