Sinclair ZX80 / ZX81 Forums

Found an old folder with the hand-written listing for an old machine code game. Originally, in 1982 it was a proof of concept, so it's quite simple, but also a bit of fun. It was written for the 4k, but I just realized it will run on 1k too. viper1k.JPG P file is available for download. The BASIC/as...

Here is a one-file program for ZX-IDE . contains BASIC and assembly (machine code) in one file. ZX-IDE will create a program and run it in EightyOne emulator by pressing one key F8. Just copy into same folder as ZX-IDE. The machine code take a number as input, column number of screen row 1, and inve...

Hi, welcome to the club. DB is "define byte", so the example aboves define two bytes. Result is two bytes long. Some assemblers (but not all) also do other functions with the ORG statement. But here it only defines the origin address of the code that follows. One helpful feature of ZX-IDE is to pres...

Reportedly the tape format is almost the same as a ZX81. See http://sinclairzxworld.com/viewtopic.ph ... bda#p14001

This two-part loader is not quite as easy to use with an emulator, but it can be done * With a real ZX81, just load Block1.p and when ready, load Block2.p. Putting them on tape one after another is the easy way * With the emulator, the tricks are to disable fast loaders, and get both programs queued...

Some clarifications: - what is the reason for the line "E_LINE defw $4401 ; ld bc, $1c44"? E_LINE defw $4401 is creating two bytes ($44 and $01) at that point in the code. And giving it the lable "E_LINE". The assembly is building up the beginning portion of the ZX81 program. ld bc, $1c44 is commen...

Just posted ZxList 6.4 to the first post of this topic. It may be downloaded from there. No dependents, should run on any 32 or 64 bit Windows. 6.4 changes: * added disassembly of REM machine/code statements * fixed overwriting of ASM/BAS files * Byte dumps are now pre-pended correctly * Now validat...

Have you ever wanted an easy way to examine machine code in BASIC files? Zxlister 6.4 can now automatically disassemble machine code found in REM statements. It creates a BASIC/Assembler file from a P or 81 file. It can also save the machine code in BIN files. Zxlister runs on Windows (95/98 or XP/7...

The loader is ingenious. I see no way to generate it on the ZX81, at least not from the Basic environment. But if you create it using special tools, it will load, then auto-run this statement which will load the next block. 1 RAND USR 16393 The System Variable NXTLIN contains the address of the BASI...

I noticed the same thing when loading P files using the EightyOne's "Auto Load on Insert" feature. After turning that off, a manual LOAD "" does not cause a reset.

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