On Fri, 06 Nov 2009 22:48:09 +0000, David Knoll
<***@davidknoll.me.uk> wrote:
|james wrote:
|> I got mine off EBAY a few years back. Every now and then they do pop
|> up on EBAY.
|
|I have one from eBay too. Couldn't find any more when I looked last night.
|
|There do seem to be some 6303s though- is the 6303 any good? I found a
|datasheet and it seems to have lots of I/O built in.
|============
The HD6303 is Hitachi's CMOS clone of the MC6801/3. The MC6803 is the
romless version of the MC6801. Both are the progenetor of the
MC68HC11. The MC6801 and the Hitachi 6301/3 use a MC6800 core
instruction set. Hitachi did add instructions like they did with the
6309. Of all the HD6303 chips on Ebay the one that might be of
interest is the 64 pin version, HD6303Y. This chip brings the address
and data buss lines out separate from any ports. This gives you three
8 bit ports in addition to the 16 address lines and 8 data lines.
You can hunt around the inernet and find out the enhanced instructions
that the HD6303Y made to the MC6800 core. I don't think they added
registers like the HD6309.
james