My first build was an 808 for my dad as I simply refused to give him one of my 286's. I'd done many upgrades to many types of systems over the years at that point, but I had yet to build one from the ground up. Between my father and I, we scavagned quite a few bits for the new system. He managed to get a 20MB (yes, just 20 megabytes) MFM ST225 HDD and controller. I already had an 30MB ST238R RLL drive and controller. I dont know why, but I put them both in. Now at that time I didnt know I could run the MFM off the RLL card, so I thought it needed it's MFM own controller. The end result was a VERY hot ST225 that somehow managed to lose it's interleave and required a complete low level format to set it back. The old MFM controller also managed to cook itself. It took me almost two weeks to figure out what had gone wrong. An old guy at a local swap meet laughed alot when I told him about both cards and explained to me how to fix the problem and that I could get and extra 50% more space from the RLL card on MFM drives anyway.
For what it was, it was a nice little box. A keyboard that could be switched from PC to AT (it was about a hundred bucks back then), EGA (yes, EGA), 9 pin printer, and a 1200 bps internal modem. I also managed to get hold of a pallete of Apple II E add in cards for PC's and stuck one in. More or less, it let you run Apple II software on a PC because it was an Apple II on an ISA card. You pulled your 8086/8088 from your mobo. You then put the CPU on the Apple card. Then you took a goofy poweder blue ribbon cable that had a connector in the sahpe of the 8086/8088 on it's end and plugged it into the CPU slot. Once all was said and done you used an Apple boot disk to tell the card to switch to the 6502 CPU on the card instead of the 8086/8088. The card also took the floppy cables from the floppy controller and routed another cable back to the drive. Yes, floppys use to have their own floppy controller cards. Many HDD cards were "deleux" and offered floppy support as well as the HDD. This was infact how the MFM and RLL cards managed to cause such a conflict in the system. Two floppy controllers trying to run at the same time.
All said and done, it got fixed and worked well for several years. Then I tried to add a Bernoulli drive to it. At this point, the machine was serveral years old and my dad still liked it. Windows 3.0 had come out and I had put it on and he loved it. So the Bernoulli drive somehow managed to cause a catastrophic conflict with something in the system. Both HDD's failed for good and never started again. At that point I had already built/rebuilt upwards of a hundred boxes so I built him another box without any problems.
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