Joerg Dietze wrote:
>
> Hi Michael,
>
> there is a simple possibility to detect serial ports:
> BIOS writes the addresses to memory from address 0040:0000, where is
> 0040:0000 com1
> 0040:0002 com2
> 0040:0004 com3
> 0040:0006 com4
> 0040:0008 lpt1
> 0040:000a lpt2
> 0040:000c lpt3
> 0040:000e lpt4
>
> An entry 0000 means "not installed".
This is where the bios "hole" problem with EPPPD comes into play.
It seems that if it finds a "0000" entry, it doesn't look further, so
if you have com4 but not com3 you have trouble.
The utility "comfix" must be used to "patch" this hole.
- Clarence Verge
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