🚀 go-pugleaf

Geoff (bi...@DeathsDoor.com) wrote:
: The MK14 used the SC/MP 1 as far as I know, there was all manner of
: interface circuitry to  do the appropriate buffering.  I've still got the

My MK14 (a fairly late one - Issue 4???) used an INS8060 CPU - which is 
the SC/MP-II. It only used a +5V supply and all the signals were TTL-level.


: original manual at my parents' house,  with a cutout photocopy of the
: instruction set  stuck on the front!  For MK14 programming you needed to
: learn the hex opcodes, as a result of which I have ever since been able to
: "think" in hexadecimal.

I can still remember some of the opcodes... Lets see now...

C4 00 07 8F FF C4 01 07 8F FF 90 F4

That was the first program I ever wrote on the MK14. I think I've got the 
last byte correct - it's supposed to jump back to the start of the 
program. 

Anyone know what it does?

I still have my MK14 and the manuals. Alas the 7805 shorted on day 
(Sinclair were too cheap to put a heatsink on it, and I didn't 
realise...) and it cooked the SC/MP and the ROMs. One day I'll put my 
spare SC/MP in the board and burn a new set of ROMs from the listing in 
the manual...


: Geoff


-tony