IBM PC hacking

[Tony Duell]

> 
> Tony Duell wrote:
> 
> > I am typing 
> > this on a much hacked 8MHz IBM PC/AT, and it has BASIC in ROM.
> 
> What *exactly* are you using here?

IBM PC/AT case, PSU, motherboard. A 486 kludgeboard in the 286 socket. A 
couple of extra EPROMs and a TTL chip to cause the former to be overlayed 
over the end of the BIOS to modify the hard disk table. 

An IBM memory expansion board. Started life as a 128K card, I figured out 
(this is not in the Techref) that in fact it could be used with 256K*1 
chips + populating the extra IC locations, to make a 1M card. Did so

A 3rd party 4M RAM card

A 3rd party card with more RAM (128K to bring the base memory up to 640K 
+ another 1.5M), 2 serial ports, 1 parallel port

An IBM MDA card + monitor

A Colourgraph+ enhanced CGA card.

A IDE + floppy card. Modified wiht a bit of stripboard and a couple of 
TTL chips to provide a drive-in-use LED for the iDE port. Connected to 
the original IBM 1.2M drive and a Teac 1.44M drive.

-tony