mcbinc at panix.com
Thu Sep 7 21:12:12 CEST 2017
On Thu, 7 Sep 2017, m brandenberg wrote:
> On Thu, 7 Sep 2017, Donald Tillman wrote:
>> How many shift register stages could you get in a chip in 1969? Four?
>> Then you'd need 8 chips for the Muse shift register. Was the 74164 8-bit
>> shift register available? Maybe not. Judging from the board layout, those
>> three 24-pin packages seem to provide 10-bits of shift register each. I
>> don't know what those could be.
> 10. :-) Those 3 large chips are 10-bit shift registers. Markings
> on the chips in my Muse suggest house markings so that's not promising.
> But the functions will all be SSI-level. Haven't checked voltage
> levels but devices may not be TTL...
More correctly: I believe those are 10-bit latches with a two-phase
clock. (I have *got* to capture my damned handwritten schematic...)
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