🚀 go-pugleaf

In article <6ar164$1...@p850ug1.demon.co.uk>, a...@p850ug1.demon.co.uk 
says...
> 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.

I think mine was Issue 2, it was definitely an SC/MP-II. I seem to 
remember that the changes to Issue 4 were mainly improved address 
decoding and a better keyboard. I had to do some cut and strap on the 
board before adding something ...(more ram maybe?)

> : 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

yes, very familiar, can't remember what 07 was though
L1:	ldi 00
	xx
	dly ff
	ldi 01
	xx
	dly ff
	bra L1

> Anyone know what it does?

was it something like shift acc right into serial out pin?
so the code would generate a tone if you connected a speaker to it?
I can't remember how long the delay instruction waited so maybe it 
flashed an LED

> 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
> 

Any chance of putting some of this information on the net ?, I've looked 
but haven't found any detailed info on the instruction set or hardware.
If I can get enough info on the MK14 (circuit diagrams anyone...?) then 
I'd quite like to have a go at writing an emulator for *total* 
nostalgia..

Simon