30 Nov
2010
30 Nov
'10
8:49 p.m.
On 30 Nov 2010 at 19:44, Tony Duell wrote:
It's a darn sight easier to debug something when
you know what it
should be doing and can see what it is doing. The former is much
easier to determine for a Z80 than many modern processors (where the
instructions are not necesarily executed one at a time in the order
you expect). The latter is also much easier to do on a system with
external program memory where you cvan conenct a logic analyser to the
ROM address lines.
Fine--why not just do the job with SSI TTL, or even discrete
transistors, diodes, resistors, etc.? I'm sure your junk box is full
of those and you can devise any sort of programming or lack thereof
that you desire.
When it comes to new designs, I prefer to live in the present.
--Chuck