If you ended up all around for the early times of the own computer system revolution, you are going to no question recall the excitement just about every time IBM announced a new variation of its beige boxes. For a lot of us, the excitement was purely vicarious, for even with the “personal” moniker, mere mortals could seldom manage a branded IBM machine. But it was still awesome to retain keep track of of the most recent releases, and dream of the days when inexpensive clones would make it probable to enjoy.
[Anders Nielsen]’s new discover of an initial IBM Design 5160 motherboard kind of echoes that long-in the past excitement, but in a diverse way. This board, from a Personal computer XT crafted in 1984, was in unidentified situation upon arrival, so [Anders] established about a mindful process to test to carry the board again to lifetime. A speedy visual inspection leaves just one with a feeling of both equally how considerably matters have changed, and how much they’ve stayed the exact same. Apart from the significant 40-pin DIP 8088 CPU and the BIOS ROMs, the board is just about entirely populated with discrete logic chips, but at the very same time, the simple footprint of a motherboard has adjusted really minor.
The convey-up system in the online video underneath contains checks of all the energy rails for shorts, which ended up being a great phone — drat people tantalums. After repairing that situation, [Anders] experienced a bit of problems obtaining the board to Article, and finally resorted to dumping the BIOS ROMs and inspecting the contents. Just one of the chips had picked up a scenario of the scramblies at some place, which was uncomplicated adequate to fix thanks to visuals of the 5160 ROMs obtainable on line. We assumed the trick of utilizing a 64k ROM and just crafting the BIOS picture twice was rather clever.
In the conclude, the board arrived up, even though without movie or keyboard — that’s for another working day. Cannot locate your have Computer system XT motherboard to participate in with? Then maybe you can just make one particular.