Milwaukee Computers MC-1200

Another small project off my plate. Ethan had asked me years ago to make copies of the software for this machine. It is pretty obscure, one full page add in Byte, and it sank without a trace. 6502, p-System, totally custom MFM-encoded floppy interface based on a Moto 6852 synchronous serial interface chip. I had bought a Supercard Pro a while ago, and set it up to do some hard-sectored floppy imaging. Figured this would be a good test case, since it didn't have the problems with dealing with out of sync data streams (the SCP doesn't grok more than one sector hole so you have to turn off index synchronization). Made images, dragged my machine out of storage, cleaned it up, made a clone from the SCP image, and it booted! yay! SCP images are up under http://bitsavers.org/bits/MilwaukeeComputers I also put up cleaner images of the schematic and board layout, and annotated a disassembly of the boot prom from a scanned listing i've had for a while under http://bitsavers.org/pdf/milwaukeeComputers One thing I noticed that made me nervous is looking at the code there is no checksum on either the sector address or data fields on the floppy. I made an image of a floppy that I bulk-erased and initialized this morning, and all you see are the sync bytes and data, no trailing data where a crc would be.