I'm starting to work through my board pile. The IRMA card is the only 8X305 I've seen lately that isn't in a disc controller.
I have a bunch more disk controllers in the queue, mostly multibus, the ADC S-100 and some others. On 11/26/16 8:39 PM, Eric Smith wrote: > Now that I have an 8X300 (etc.) disassembler, which I've used to > disassemble the Western Digital WD1000 and WD1001 firmware, and the Zendex > ZX-203 firmware, I've become curious as to what other products used the > SMS300/8X300/8X305. Does anyone know of any? > > In the early to mid-1980s, the 8X300 was a good choice for hard disk > controllers, because all instructions took 250ns, and a single instruction > could read an I/O port or RAM location, shift and mask, and write another > I/O port or RAM location. At the time, no MOS microprocessor was even close > to that. >