Search found 2038 matches

by dr beep
Sun Feb 25, 2024 1:14 pm
Forum: Hardware
Topic: How close is the ZX80/81, Jupiter Ace and Spectrum in machine code backwards hardware compatibility?
Replies: 5
Views: 111

Re: How close is the ZX80/81, Jupiter Ace and Spectrum in machine code backwards hardware compatibility?

Comparing a ZX80/ZX81 with a ZX Spectrum: there are significant differences in hardware and in the BASIC. The memory map is not too much of a problem except that in a ZX80/ZX81 the 'display file' is determined by software. But in the ZX Spectrum, it's fixed in the 'lower' RAM area. It also is much ...
by dr beep
Sun Feb 25, 2024 12:58 pm
Forum: Hardware
Topic: 16k Sinclair issue 1 pack
Replies: 30
Views: 539

Re: 16k Sinclair issue 1 pack

Try this game without RAM-pack.
Does the ZX81 show the right picture then?

You can do it, the game is my 1K 3D Random maze (Game 5 of 81 1K hires games)
by dr beep
Sun Feb 25, 2024 12:55 pm
Forum: ZX BASIC
Topic: New Screen Saver :-) Enjoy!
Replies: 3
Views: 254

Re: New Screen Saver :-) Enjoy!

1024MAK wrote: Sun Feb 25, 2024 11:15 am Here's my screensaver:

IMG_7867.jpeg

Runs on a 1K machine.

Mark
Shorter:

Code: Select all


+ABS INT -PI

can be

-INT -PI
[/code\
by dr beep
Sun Feb 25, 2024 12:48 pm
Forum: Hardware
Topic: How close is the ZX80/81, Jupiter Ace and Spectrum in machine code backwards hardware compatibility?
Replies: 5
Views: 111

Re: How close is the ZX80/81, Jupiter Ace and Spectrum in machine code backwards hardware compatibility?

Is it a matter of different address mapping, such as it would work if you had a system that remapped the address space when running a program for another system, or are they fundamentally different? My emulators remap all memoryaddresses up 32K. In (very) short: ZX81/ZX80 #0000-#1FFF ROM #4000-#7FF...
by dr beep
Sun Feb 25, 2024 12:40 pm
Forum: Hardware
Topic: How close is the ZX80/81, Jupiter Ace and Spectrum in machine code backwards hardware compatibility?
Replies: 5
Views: 111

Re: How close is the ZX80/81, Jupiter Ace and Spectrum in machine code backwards hardware compatibility?

Hi, I'm curious in how backwards compatible programming in machine code, is between hardware in the ZX80, ZX81, Jupiter Ace and Spectrum? Define compatible. As said. Storage on tape is already different so you need additional software to load from tape. Another problem is the fact that ROM is on th...
by dr beep
Thu Feb 22, 2024 10:11 pm
Forum: ZX Spectrum Lounge
Topic: how did zx spectryum programmers make those big character graphics in games?
Replies: 3
Views: 194

Re: how did zx spectryum programmers make those big character graphics in games?

dr beep wrote: Thu Feb 22, 2024 9:09 pm Outside assembly?

Define UDGs and use those to print, like SMURFS
https://www.spectrumcomputing.co.uk/ent ... m/Schlumpf

or make your own characterset
by dr beep
Thu Feb 22, 2024 12:29 pm
Forum: Welcome Area
Topic: Hello from Poulette73
Replies: 9
Views: 396

Re: Hello from Poulette73

Hello everyone, I'm Olivier, 51 years old, and I live in France. Welcome. I also bought a ZXPand+ extension in order to take advantage of the SD support I can't wait to discover games and utilities. lucky you, not everyone can get a zxpand. As for games.... you can try my 1K hires games (and 1k low...
by dr beep
Sat Feb 17, 2024 9:03 pm
Forum: GAMES
Topic: New ZX81 Games
Replies: 358
Views: 614929

New 1K Game : DALEKS (256 bytes)

Name of Software: DALEKS Author: Johan "Dr Beep" Koelman Release Date: 17/02/2024 Requirements (eg. 1K, 16K, AY Card, Hi-Res Scheme): 1K lowres Commercial / Public Domain / Free ware / Other - please specify? Freeware Description: A game were you must dodge daleks. Daleks.png Downloadlink: Dalek003....
by dr beep
Thu Feb 15, 2024 6:47 pm
Forum: GAMES
Topic: how to make something intentionally crappy for the CGC 2024
Replies: 18
Views: 1088

Re: how to make something intentionally crappy for the CGC 2024

Its tongue in cheek yes? By calling it "crappy" there's no pressure that it has to be great, but I can't imagine making it crappy on purpose. We code as best we can, but others may call it crappy but its the best we can do. If we get lucky, we might actually do a "good" app lol. We (me and "compute...