Sinclair ZX80 / ZX81 Forums

I want to hardcode the ZXpand ROM for PAL, as the Lambda 8300 has a different PAL/NTSC detection. I changed 02DF: ADD A,1F to 02DF: LD A,37 This makes MARGIN be $37 always which I can read in the disassembled ZX81 ROM is for UK (PAL). The two statements have the same 7 T-states, so timing should be ...

Exactly. Thank you!

I remember a year or more ago someone posted a demo using a ZXpand to show a menu of about 20 selection options. When a letter was pressed on the keyboard a screen was loaded in either text or graphics. Another key would swap between text and graphics. This would show about 20 highlights of ZX81, it...

They load fine outside File Commander. So it shouldn’t involve the PIC.

If it’s too complicated to test with E-FILE, then maybe a Force Load command

Great program. One thing I miss: Unfortunately Execute does only work on .P files. I have files with different extensions that are ordinary program files. .AS2 ZX Assembler 2 source .TAS Tasword files .WS2 WordSinc II.3 files .BER Berch Assembler source Etc. These cannot be loaded with ZXpand Comman...

I have used a ZX81XT to get space between my Lambda 8300 and the ZXBKBv3 keyboard controller I've built. But yesterday all kinds of chars came randomly on the screen, but the computer worked. It was hard to use, as most of the chars on the screen were corrupted. This was very frustrating. Finally I ...

I have a non-working ZX Printer for display, and an Alphacom 32 for printing.

Pro Built-in sound Built-in Joystick Executes machine code above memory address 32k (no M1NOT problem) Con Not all hardware extensions work No Hires or Pseudo Hires (WRX, G007, ARX) No User Defined Characters (UDG) External keyboard corrupts load from tape Detection of NTSC/PAL on different I/O-por...

The ZX81 printer that works decade after decade is Alphacom 32 (or in the US: Times Sinclair 2040). There are 5 on sale on eBay. http://r.ebay.com/3deYoi http://r.ebay.com/eBU2vb http://r.ebay.com/AxJ544 http://r.ebay.com/5cHLGT http://r.ebay.com/OCp54t Edit: There are also 3 Timex Sinclair 2040 mod...