10 Dec
2008
10 Dec
'08
2:26 p.m.
Chuck Guzis wrote:
On 10 Dec 2008 at 19:24, Tony Duell wrote:
Given the simplicity of the AVR and PIC tools, you could easily host
a development system on a 8080, Z80, 6502, etc.-based system,
provided that you had the necessary (e.g. parallel port) interface.
I've not seen any Z80-based VHDL compilers, but then, maybe I'm not
looking hard enough. :)
Move up to 18bits ... buy Ben's new CPLD bug free [1] chip set or wait
late 1975 ish
for the 48 PIN dips to come out.
But when you think of it, most develpment on the small 8 bit micros
were done by hand ... ie Apple integer basic or cross compiled on a larger
machine PDP-10? under Fortran IV. PL/M for the 8080 comes to mind.
From the
discussion fo the AVR and PIC microcontorllers, it appears that
should I wish to
program them using an HP9816, or a PERQ, or a PDP11,
or... then the information is available to do so. I can write a
cross-assembler, debugger, downloader, etc. You may feel that's not a
sensible use of my time, byt darn it this is a hobby, and it is very
difficult to justify time spent on hobbies _other than 'you enjoy doing
it'.
Cheers,
Chuck
The instruction set is very 1969 ish, but it does have a software stack
and the idea of character data. The CPLD design is a emulation of
the 48 pin CPU, in that it is functionaly the same design, but not hardware
compatable as small PCB that fits over a 48 pin socket.
http://www.jetnet.ab.ca/users/bfranchuk/fox1.html
[1] ISZ sadly was one the few instructions not implimented as well as skips
and PUSH/POP. They are features not bugs.