On 2014-02-13, Dennis Lee Bieber <wlfr...@ix.netcom.com> wrote: > An S-100 wire-wrap board.
Yup, been there done that! I had a second-hand, off-the-shelf S-100 Z80 CPU board, a second-hand S-100 memory board with 4KB of DRAM (eight 4Kx1 chips) and 2KB of ROM (eight 256x8 Intel 1702A EPROMS), a home made backplace PCB with 5 or 6 slots, a home-made S-100 wire-wrapped board with two UARTs and some other miscellaneous stuff. I shoved it all into rack-mount Motorola Exorciser chassis I pulled out of a dumpster. > I hand assembled a monitor program with, as I recall, 0..F, High, > Low, Store, Go functions for the keyboard/display. I was living large: I had access to an Intel MDS-800 "blue box" system in one of the University's labs. It ran CPM with dual 8" floppies and an EPROM programmer. [I think it also may have run some proprietary Intel OS, but I was a CP/M man.] I typed in an assembly language monitor program out of some book or other, assembled it on the MDS-800, burned the ROMs, hooked up a borrowed Lear-Siegler ADM3A terminal to my wire-wrapped serial board, and it actually worked for a little while before something failed. Building reliable wire-wrap stuff is a real art -- unfortunately one I never learned. It also could have been the backplane that failed: the S-100 bus connecters never _quite_ lined up preciesly with the card cage's guides, so there were probably mechanical stress issues. -- Grant -- https://mail.python.org/mailman/listinfo/python-list
