Sinclair ZX80 / ZX81 / Z88 Forums

Yes, probably with a binary code loaded in a blank rem…
I haven't the HOT Zii installed on my computer, but il will have a look.

(We can try to rebuled a REM in TASM using "db $00,$00,$01,$02...")

At a second look, the R31 resistor isn't shunted.
It's safe on the Mic socket too on the french board.

No, the jack return to the right place… And the computer start properly. But, in the real world, the Mic and the Ear jack was connect at any time, and the power socket was the only one to be feed ! No, the main problem is to invert the power supply polarity… it's a component firework… RAM, ULA, the ...

I had to unplug it… no pictures !
No, the mistake seem to be … safe for the ULA ship.
C10 & C12 can isolate the ULA, but in the french display mod, the transistor TR3 can be toasted by the 9v voltage on the Mic socket.

Yes, surely the worst design mistake from Sinclair on the Zx81... (Spectrum?) !
Use same socket with ear/mic, and the 9v power supply…


I've been wrong many times before.

No way on Zx81!

It's a TZX with a RAW wav sound designed to run on MFM waves…
'P' take less memory room, and this format is used in FLM and or protected SPECTRUM files (Speed load…).

It's a Spectrum format from "Speculator" (not a Freeware software) .

Another way to glue a cluster of REM in Basic: 1 REM *************************** 2 REM *************************** 3 REM *************************** 4 REM *************************** 5 REM *************************** 6 REM *************************** 7 REM *************************** 8 REM *********...

Hi desSony, Yes, this executable was compiled with the Visual Basic, and we had to install some Dlls on the Windows 10, 8, 7, 2K, 98, 95... It's the same Dlls for Vb81 XuR and others programs… Have a look to this link to install Dlls... (Just install this kit one time to use all of VB packages) This...

Don't know about the .B80, but you can convert a text file to "O" with "ZxToken". (Win32)

To code a little driver, i built a Kicad project from the french "Micro-Systèmes" #47: "interface universelle" with a 8255 PIO. http://abandon.pcbs.free.fr/hd-pictures/MS_n47_UI_8255_Zx81_1.jpg Monitor ROM & PCB: http://abandon.pcbs.free.fr/MicroSystemes.htm http://abandon.pcbs.free.fr/MicroSystemes...