Sinclair ZX80 / ZX81 / Z88 Forums

Hi, In BASIC, you had to place the bloc at the right raw for each line: 10 FOR A=0 TO 17 20 PRINT AT A,10;" ";\ AT A+1,10;"(I)";\ AT A+2,10;"¬¿ª";\ AT A+3,10;"ºL°";\ AT A+4,10;"·®¶" 30 NEXT A 50 FOR A=17 TO 0 STEP -1 60 PRINT AT A,10;"²¸¹";\ AT A+1,10;"º7°";\ AT A+2,10;"¯¾¼";\ AT A+3,10;"(I)";\ AT A...

Good job Wilco2009,
Thanks.

Hi Mark,
Yes, it seem better now








Kicad project (wip temporary prototype)
http://zx81.ordi5.free.fr/brico/Carte_8Sana/

Wiring diagram updated:

Vss> GND
Vref on a terminal
\LDAC> GND or /WR (jumpers)
\ROMCS>high

Picture in the next message >>>

Thanks Paul & Mark, @Paul: Yes,better to force /ROMCS to deactivate the RAM/ROM process. (ROMCS:high & RAMCS:high to get an ambiguous/undetermined stat) The MEMOTCH HRG also use the 0-1fff RAM location. @Mark: Thank, i had to primary set the DAC, and feed the DATAS in the buffer. I had to use it wit...

Hi, I plan to build a ZX81 card around the AN7225 chipset. But i cant figure out the "\LDAC" process ! Can you help me, please. an7225.JPG AD7225 Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/AD7225.pdf My wiring diagram (POKE 0-7,value to set the output voltage= POK...

More infos:

Video "ZX81 Adventure: The Trevor Toms System!" by WhatHoSnorkers.
https://www.youtube.com/watch?v=p4_H08SNBPg

"Proportional Joystick interface" PCB from Fred Nachbaur [ZX-Appeal #Mar-Apr-89]
GERBER & Kicad project:
http://abandon.pcbs.free.fr/ZxAppeal.htm

Have Fun.

https://www.sinclairzxworld.com/download/file.php?id=13956&t=1 BadUDG.jpg "CLEAR " ... The UDG table seem to be in the right memory offset. Char. offset+0 : NOK ("00000000")>("00000100") Char. offset+1 : NOK ("00000001")>("00000101") Char. offset+2 : NOK ("00000010")>("00000110") Char. offset+3 : N...