[sdiy] Javascript Muse

m brandenberg 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...)

Monty Brandenberg

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