27 Nov
2016
27 Nov
'16
7:17 a.m.
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.