22 Jun
2007
22 Jun
'07
10:02 p.m.
On 23 Jun 2007 at 0:40, Sridhar Ayengar wrote:
How does one implement a 1-bit program counter? Seems
to me being able
to distinguish between two program instructions doesn't seem *all* that
useful. 8-)
The program counter (like memory and its addressing as well as
registers to hold a jump target) was to be provided externally. The
MC14500 handled data in 1-bit chunks, but had a 4-bit instruction
word. But the exact meaning of the JMP instruction was left up to
the customer.
When I first saw the datasheet for that silly chip, I thought one
could do considerably more with a sequencer consisting of a ROM and a
latch.
Cheers,
Chuck