oh, and the Xerox 6085 disk controller with tags is high on my list to know the innards, especially the difference between the two known revisions
On 11/27/16 7:14 AM, Al Kossow wrote: > 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. >> >