On 25 Nov, Alex Buell wrote: > Ah yeah, the infamous COM4 bug with S3 chipsets.
Actually it had precedence: some IBM video board (8514/A??) used that
very address first.
> Seems some fuckwit used the usual COM4 I/O port as one of its I/O > registers.
It wasn't the COM4 address but something like 0xBE8 with the low 10 bits
identical to 0x3E8, which is the COM4 base port. You'll need an
el-cheapo serial board with 10-bit address decode only to be bitten by
this.
> Ahh, that particular chipset designer should have been taken out and made to use Microsoft > products in eternity (with a Windows 95 Beta!).
Or the engineer at IBM who decided that only decoding the low 10 bits
for i/o port accesses was enough for all future.
/Daniel
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