Search found 50 matches

by David G
Sun Sep 21, 2014 8:37 am
Forum: Development
Topic: Unkatris, another tetris clone
Replies: 21
Views: 6941

Re: Unkatris, another tetris clone

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...
by David G
Sun Sep 21, 2014 7:07 am
Forum: Development
Topic: Unkatris, another tetris clone
Replies: 21
Views: 6941

Re: Template for Make1K.exe

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...
by David G
Fri Sep 19, 2014 10:18 am
Forum: Development
Topic: ZxList 6, P file to BASIC conversion app
Replies: 29
Views: 9786

ZxList 6.4, now disassembles machine code

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...
by David G
Fri Sep 19, 2014 10:11 am
Forum: Development
Topic: Disassembly of Machine Code in REM statments
Replies: 1
Views: 1328

Disassembly of Machine Code in REM statments

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...
by David G
Wed Sep 17, 2014 12:26 pm
Forum: Development
Topic: Unkatris, another tetris clone
Replies: 21
Views: 6941

Loading System for 1k program

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...
by David G
Mon Sep 15, 2014 5:00 am
Forum: Emulators
Topic: EightyOne suppress reset / autoload (tzx)
Replies: 2
Views: 2897

Re: EightyOne suppress reset / autoload (tzx)

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.

Toggle this button:
EightyOne's "Auto Load on Insert" feature
EightyOne's "Auto Load on Insert" feature
81_Autoload.JPG (13.61 KiB) Viewed 2890 times
by David G
Thu Sep 11, 2014 10:34 pm
Forum: Emulators
Topic: JSZeddy
Replies: 47
Views: 19605

Re: JSZeddy

Works well on Chrome 37

I noticed:
* it loads with a black screen. The Reset button starts the ZX81
* the keyboard backspace key is not mapped to the Rubout key
* the edit line moves to the top of the screen at times, but seems to recover by itself
by David G
Thu Sep 11, 2014 10:25 pm
Forum: Emulators
Topic: JSZeddy
Replies: 47
Views: 19605

Re: JSZeddy

Progress on IE8 -- it now shows a keyboard and buttons for start, stop, reset, etc. Message: Object doesn't support this property or method Line: 12 Char: 2 Code: 0 URI: http://rullf2.xs4all.nl/jszeddy/canvas2image.js Message: Object doesn't support this property or method Line: 145 Char: 2 Code: 0 ...
by David G
Mon Sep 08, 2014 9:18 am
Forum: Hardware
Topic: RAM pack manufacturer
Replies: 2
Views: 947

Re: RAM pack manufacturer

Perhaps so. Prism Microproducts was the sole distributor of the ZX81 in Britain to small retail organisations with fewer than 20 outlets. They also published Sinclair User magazine. http://wikipcpedia.com/wiki/the-second-wave-as-pcs-abound/through-a-prism-%E2%80%93-sinclair-distribution/ http://www....
by David G
Sat Sep 06, 2014 11:08 pm
Forum: Emulators
Topic: JSZeddy
Replies: 47
Views: 19605

Re: JSZeddy

With IE 8 I know see a ZX keyboard!


But only briefly before

Message: Object doesn't support this property or method
Line: 12
Char: 2
Code: 0
URI: http://rullf2.xs4all.nl/jszeddy/canvas2image.js

Message: Object required
Line: 157
Char: 5
Code: 0
URI: http://rullf2.xs4all.nl/jszeddy/jszeddy.html