Search found 44 matches

by David G
Thu Sep 11, 2014 10:34 pm
Forum: Emulators
Topic: JSZeddy
Replies: 47
Views: 16907

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: 16907

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: 848

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: 16907

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
by David G
Fri Sep 05, 2014 9:00 am
Forum: Emulators
Topic: JSZeddy
Replies: 47
Views: 16907

Re: JSZeddy

I wonder if the problem with Android Browser is that the soft keyboard by design does not appear unless focus is set to an input element. In Internet Explorer 8 the error is: Message: Object doesn't support this property or method Line: 18 Char: 2 Code: 0 URI: http://rullf2.xs4all.nl/jszeddy/zeddy.js
by David G
Fri Sep 05, 2014 3:30 am
Forum: Hardware
Topic: American ZX81
Replies: 2
Views: 828

Re: American ZX81

My ZX81 purchased in kit form back in the day (1981?) was the same. Channel 2/3 switch included.
by David G
Fri Sep 05, 2014 3:26 am
Forum: Emulators
Topic: JSZeddy
Replies: 47
Views: 16907

Re: JSZeddy

Is it a ZX81 emulator that runs in JavaScript?

With Android Browser I see some register boxes flashing, and eventually a K prompt, but there does not appear any way to enter commands.
With IE 8, I see only the register boxes and a script error.
by David G
Sun Aug 31, 2014 11:40 am
Forum: Development
Topic: ZxList 6, P file to BASIC conversion app
Replies: 29
Views: 9019

Re: ZxList 6.3 UPDATE, P file to BASIC conversion app

6.3 most importantly fixes the graphics codes. Both translation and presentation. (Will use the Sinclair font if it is installed on your PC). Attached to the first post of the this topic . This runs on Windows (including Windows XP, Windows 7 and Windows 8). zxlist63.JPG Changes: * corrected graphic...
by David G
Sun Aug 31, 2014 11:13 am
Forum: Development
Topic: Machine code analyis: Froggie 1983 game
Replies: 1
Views: 1064

Re: Machine code analyis: Froggie 1983 game

The Goodbye routine uses standard graphics characters placed in REM 8.

I wonder how he originally created this text -- with a special tool, or simply by trial-and-error on a the ZX81 keyboard?
Goodbye-REM8.JPG
Goodbye-REM8.JPG (14.91 KiB) Viewed 1059 times
by David G
Sun Aug 31, 2014 11:00 am
Forum: Development
Topic: Machine code analyis: Froggie 1983 game
Replies: 1
Views: 1064

Machine code analyis: Froggie 1983 game

Froggie (1983) has some interesting code -- and is a topnotch ZX81 game too. Froggie (1983) by Richard Braunton * Transitions between screens. Simple code, but very effective. See sample code in Transition Effects Code * Press A Key prompt animation screen at USR 22477 press-a-key.JPG * Goodbye disp...