23 Dec
2006
23 Dec
'06
3:04 p.m.
On 23 Dec 2006 at 13:31, Richard wrote:
Hi,
Does anyone know if its possible to have multiple CGA cards on an ISA
bus? I have a feeling the answer is no...
No, but I suspect with a few cuts and jumpers (and maybe without
extra "glue") it might be possible. The CGA maps its display buffer
into physical address B8000-BDFFF. One could change the mapping to
E0000-E3FFF by swapping A18 and A15. Likewise, the CGA I/O range is
basically 03Dx, so juxtaposing A8 and A5 would turn this into 2Fx.
What do you all think?
Cheers,
Chuck