IBM PC hacking

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