Sinclair ZX80 / ZX81 / Z88 Forums

A 2764 EPROM with a bit of pin re-wiring is one commonly used. You can program this with either Husband ZXforth or Asmic (I don't know too much about this one) then there's the recently developed double speed ROM or you could program the ZX80 ROM code into it and with the help of five resistors sold...

Here you are Martin. In the folder are three files. ASSEMBLE.P ASMBIN.P and finally the text manual. Making sure the two P files are in the same folder. Load the self running file ASSEMBLE.P which will then do two things. 1) It lowers ramtop down to the example shown in the manual. The two pokes in ...

If you posses a ZXpand I can supply the EPROM code for the Memotech Z80 assembler interface which when loaded in the ZXpand to the address in the memory map this interface occupies allows the ZXpand to imitate the device. The self running P file loaded from the memory card does all that is needed fo...

Incense sticks to test the air flow!!!

That one sentence has just made my day.
No dreary smoke match or taper but a bloody joss stick. A nice aroma as well as a flow test.

Something tells me Mr Machine that you will fit in right well here.

Ditto the switching reg for me too. The fan mod I did was for proof of concept only and my other zeddies trundle along quite happily with changed regs only.

An excellent and well worded post,absolutely spot on Mark.

No trouble RT glad to help will rename as you suggested and try it out in Eighty One.

EDIT.
Just realised this ROM already exits in the ROM folder of Eighty One!!!!

As promised the old bugged ROM in P file format.

To view load into ZXspand at suitable address as per the manual (I chose 32767) or block load into Eighty One.

To turn this into something usable I leave to others as my learning doesn't stretch that far.

Like Lardo I too have said ROM so will have a play around tonight by fitting it to my test zeddy and dumping its contents to the ZXpand, save it and post on here as a P file if that helps?

In my set-up I removed the slats in the lower case and opened the aperture enough to house the 40mm fan. At first I was going to fit a switching regulator to this board but decided against it as I wanted to see if it could sufficiently cool the standard regulator and its associated heat sink. I then...

Moggy, I might try to insert a tiny blower-style fan below or to the right of the CPU/PLA with an air tunnel blowing on PLA heat sink in a future project, like what you would find in portables. A blower might be thin enough to fit over the resistors in a standard case and even at slow speed should ...