31 Jul
2004
31 Jul
'04
9:25 a.m.
From: "John Honniball"
<coredump(a)gifford.co.uk>
Dwight K. Elvey wrote:
Hi John
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.
Dwight
Does anyone have any data books with the specs
and signals for Rockwell's 4 bit processors that
they made during the late 70's? These were in a
funny flat pack called spider chips.
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?
--
John Honniball
coredump(a)gifford.co.uk
31 Jul
31 Jul
12:07 p.m.
Dwight K. Elvey wrote:
>From: "John Honniball"
<coredump(a)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(a)gifford.co.uk
7448
days inactive
7448
days old
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