Search found 44 matches

by David G
Thu Aug 28, 2014 8:50 am
Forum: Emulators
Topic: New version emulator ZEsarUX-1.2
Replies: 1
Views: 2190

Re: New version emulator ZEsarUX-1.2

Runs on UNIX-type systems including Mac and Linux. Looks like an update to the topic ZX80/81/Spectrum emulator for Unix
by David G
Thu Aug 28, 2014 8:38 am
Forum: Development
Topic: Transition effects code
Replies: 1
Views: 779

Transition effects code

While analyzing an old game, I came across two interesting screen-wipe effects. I call them TRANSITION_CLOSE and TRANSITION_OPEN. * demo program is attached (TRANSITIONS.p) * assembly language source code in ZX-IDE format is attached (TRANSITIONS.asm) The machine code was found in Froggie 1983 by Ri...
by David G
Thu Aug 28, 2014 8:30 am
Forum: Development
Topic: Waiting some time!
Replies: 21
Views: 4859

Re: Waiting some time!

Many of the old games and programs used something like this:

Code: Select all

ld      hl,5000h ;delay factor
call    DELAYHL
...

DELAYHL:
        dec     hl
        ld      a,h
        or      l
        jr      nz,DELAYHL
        ret
by David G
Thu Aug 21, 2014 7:19 am
Forum: Development
Topic: tetris file for ZX-IDE
Replies: 1
Views: 782

Re: tetris file for ZX-IDE

A simple variation that can be made to the Assembly Language is to change the Keys used by the game from From S, D, K, L to the arrow keys v, <, > Change these lines cp 030h ;left (k) ... cp 031h ;right (l) ... cp 029h ;drop (d) to cp 21h ;left (5 "<-"") ... cp 24h ;right(8 "->"") ... cp 22h ;drop (...
by David G
Thu Aug 21, 2014 6:40 am
Forum: Development
Topic: tetris file for ZX-IDE
Replies: 1
Views: 782

tetris file for ZX-IDE

An interesting file to study to learn how to integrate machine language code into a ZX81 program (tetris1k, public domain code by Russell Marks) The ASM (language assembly) file only needs to be unzipped into the ZX-IDE folder. 1. Start FASMW-ZX.EXE 2. open Tetris1k.asm 3. press F8 to compile the co...
by David G
Sat Aug 16, 2014 6:58 am
Forum: WANTED
Topic: ZX81 folding Reference card
Replies: 9
Views: 4464

Re: ZX81 folding Reference card

Reference Card For The ZX80,ZX81 and the Timex Sinclair TS100
Cyborg Software Systems
1982
by David G
Sat Aug 16, 2014 6:46 am
Forum: WANTED
Topic: ZX81 folding Reference card
Replies: 9
Views: 4464

Re: ZX81 folding Reference card

Yes that was the most useful reference card. I used it every time I used my ZX81, for 30 years until last August. I moved overseas so gave away all my ZX81 stuff. The Reference Card for programming. http://kiteba.files.wordpress.com/2013/08/photo-3.jpg http://www.vintage-computer.com/images/sinclair...
by David G
Fri Aug 08, 2014 4:36 am
Forum: Software
Topic: [HELP] Recover assembler code from .p file
Replies: 11
Views: 4979

Re: [HELP] Recover assembler code from .p file

Anyone wanting to do this might give ZX Lister a try. By default it will save machine code containted in REM statements in separate files. Then it is easy to use the machine code in another program (by using ZX-IDE) or use with a dis-assembler to generate assembly langauge. ZX Lister creates a BASIC...
by David G
Fri Aug 01, 2014 12:59 am
Forum: Software
Topic: Real Time Clock for ZX81
Replies: 9
Views: 5254

Re: Real Time Clock for ZX81

It also demonstrates how to run two "apps" at the same time. Very interesting.
by David G
Thu Jul 31, 2014 8:10 am
Forum: Development
Topic: ZxList 6, P file to BASIC conversion app
Replies: 29
Views: 9019

Re: ZxList 6, P file to BASIC conversion app

Hi PokeMon,

The partial memory transfer is an excellent idea, and something like that is needed for the ZX81.

I may be able to assist with the P file import as I have coded DLLs before. I will send you a PM.

- David