Dwight K. Elvey wrote:
>>From: "John Honniball" <coredump_at_gifford.co.uk>
>>I have a book by Steve Money called "Microprocessor Data Book", and
>>it lists three Rockwell 4-bit chips, the MM75, MM76 and MM78. They
>>make up the PPS4/1 Series. Are they the ones you are interested in?
...
> Hard to say. The chips I have all have inhouse numbers on them.
> It sure does sound like the right stuff though. The chips are
> all 42 pin spider chips.
There's no detail about the packaging, but only one chip has 42 pins.
The MM78 (and MM78LA) is listed as "42-pin quad in line". That chip
has 2k of 8-bit ROM, 128x4 bit RAM and 31 I/O lines. Instructions
are 8 bits wide, but the ALU and memory are 4-bit. Maximum clock
frequency is 100kHz.
--
John Honniball
coredump_at_gifford.co.uk
Received on Sat Jul 31 2004 - 19:07:18 BST