Tony's kit, was: Re: USB Stuff

I am sure I described it a couple of weeks ago here, and I've not downgraded [1] since then [1] That is, to sowmthing without schematics. OK, here you are again : A much-hacked IBM PC/AT (8MHz system board). The mainboard has a 486 kludgeboard in the 80286 socket. I've added a couple of EPROMs and a bit of logic to overlay the last 8K of the bios, so I could modify the hard disk parameter table. Thers's 512K on the mainabord. Abother I/O card adds the 128K to bring it up to 640K + anothet 1.5M extended memory + 2 serial ports (16550s, of course, I want to give this processor all the help it can get) and a parallel port. Another expansion board started off life as an IBM 128K card. I figured out it could be populated with 2 rows of 256K bit DRAMs, and a bit of extra logic, and turned it into a 1M card. Although all the traces for this were there, etched on the board, I can't find any mention of this in the TechRef. And another board adds a further 2M of RAM. There's an original IBM MDA board linked to a 5151 greenscreen monitor. And a Colorgraph+ (Enhanced CGA card, with enough RAM for 640*200 in 8 colours, pity nothing supports it). That's linked to an NEC monitor that was used with an Apple ][, which I modifed to add the intensity line. The disk controller is an early IDE card, a few TTL parts, a couple of PALs and a floppy controller chip. I added a daughterboard containing a couple more TTL chips to flash the frontpanel drive LED when the hard disk was accessed. It's linked to the original IBM 1.2M drive and a Teac 1.44m 3.5" drive. And to a 1.3G IDE winchester. TO actually connect to the phoneline, I've got an old USR Sportster 14K4 modem. That, and the hard drive, are the only parts of the system I don't have full schemaitcs for. -tony