Other SMS300/8X300/8X305 uses?

Al Kossow aek at bitsavers.org
Sun Nov 27 09:17:12 CST 2016

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.

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