Re: Information on the PPS-4/1 4 bit microprocessor wanted - MM76E (not MM76EL) - cctalk

5 Dec 2025

Resurrecting a very old (2011) thread about PPS-4/1 - I'm looking for
data sheet on the mm76E - the pinout in particular - as I am trying to
sketch out the schematic of a home pinball game that used the MM78 CPU
and the MM76E for memory.
Bitsavers and everyone else has the sheet for the MM76EL which is the
40-pin version of the original spider chip and those pages talk about
how the EL does not require as fussy a voltage for Vss.
Anyway, if anyone has this data I'd appreciate it!
Thanks,
John :-#)#
On 2011-10-31 1:29 a.m., Eric Smith wrote:
...
  Benjamin Sølberg wrote:
  So if you multiplex 8 leds you need 8 times the
peak current to keep
  the
  same luminance ?

 8:1 multiplex requires 8 times the peak current to get the same
 average power.  Years ago I saw some claims that with multiplexing you
 can use lower average power for the same perceptual brightness, due to
 retinal persistence.  However, I've seen other people claim that this
 is not true.  It would be entertaining to set up a double-blind test
 and find out.