FPGA VAX update, now DIY TTL computers

[Chuck Guzis]

On 11/11/2005 at 11:12 PM woodelf wrote:

>PS.  As for getting  7400 off  scrap boards, if I had the scrap boards I 
>would most likely try to get the scrap item working again. :D

There are plenty of junk boards that have no particular useful function.
I've got a bunch of ISA cards that I salvaged.  All were old models of a
gizmo that appeared to a PC as a monochrome adapter, but which translated
the CPU writes to video memory to serial codes to a VT-220 type terminal.
Why would anyone want to do this?  Dunno--it wasn't fast and all of these
boards lack the PROMs that would make them work in any case.  But they've
got lots of LSTTL, some 4x16K DRAMs and a Z80A, Z80 CTC and a Z80 DART, all
in sockets.  Perfect scrap items.

Cheers,
Chuck