Sinclair ZX80 / ZX81 / Z88 Forums

Hej Martin

"I think you could PEEK the RAMTOP addresses."

Exactly what i did, but thought that a quicker way was possible...Thx for reply!

Finally got my hands on a running Your Computer. I will ad the computer to the the thread regarding chip version, soon. First i have a question: Does the Lambda have a command, showing the available amount of RAM (internal or expand)? Something like DIR ot CHKDSK in Windows…. Could be nice to check ...

Anyway, my intention is to bring the unit alive again. Until now all DC supplies to the IC’s is checked and the crystal is generating a pulse to the CPU. But that where the dynamics ends - no beep when started, and no output to monitor or TV. Not finding a video output on either tv or monitor, on t...

Ok With a seral number 017150 on my Lambda, the “new” ROM must be manufactor-fitted. Martin: Seems you have been into the details with this old machine. When i have got me another Lambda, i will try swabbing IC’s to detect the faulty one. Everything else on the board seems okay. Until now, thx for r...

Arhhh du er hurtig.

Fandt din danske udgave, og kan se at indholdet er identisk med min manual.
Derimod er min forside anderledes, men stadig i en revision 1983 i indledningsteksten.

Tak Martin

Nu vi er ved det danske:
Jeg har en original brugervejledning til Lambda 8300, som jeg kunne indscanne, og placere på dette forum. Syntes jeg faldt over nogle på engelsk herinde, men ikke umiddelbart nogle på dansk.

Hi Martin and Mark. Thanks for your comments. I thought the modified ROM and board modifications was applied by a previous owner, but as i read your comments, modifications is done by the manufactorer? To me, the handwritten yellow label with the year 1985, seems pretty DIY style. Anyway, my intenti...

My Lambda 8300 chipset:

CPU: NEC Japan D780C-1 8338X5
ULA: C4005 2783
ROM: NEC Japan D2764D (modified which include some modifications to the board)

Hi Sinclair ZX World. Electronic engineer from Denmark signing in. My first computer at all was the Maraton 32K purchased second hand in 1983. Originally sold from a toy store in Copenhagen. A lot of fun learning Basic via small programming examples in data magazines, and re-entering the code when t...