Search found 1283 matches

by dr beep
Sun Apr 05, 2020 10:19 am
Forum: Emulators
Topic: ZXSimulator for the Sinclair QL
Replies: 33
Views: 2518

Re: ZXSimulator for the Sinclair QL

Welcome to the forums - great to see a new ZX81 emulator for the QL - there is an existing one, but whilst the Spectrum emulators have had several versions and improvements, there has only ever been Xtricator (http://www.dilwyn.me.uk/zx81/index.html). And the developer died a few years ago so no up...
by dr beep
Tue Mar 17, 2020 3:51 pm
Forum: Welcome Area
Topic: hello from Belgium
Replies: 3
Views: 1558

Re: hello from Belgium

Welcome...

You have a few years to catch up.

A kot of software was made in the 21th century.
by dr beep
Thu Feb 27, 2020 7:05 pm
Forum: GAMES
Topic: Super Star Trek
Replies: 23
Views: 9335

Re: Super Star Trek

I think this should fit 16K machinecode.
by dr beep
Thu Feb 27, 2020 6:59 pm
Forum: GAMES
Topic: Super Star Trek
Replies: 23
Views: 9335

Re: Super Star Trek

Can't get it to work in EO due to reset when loading next program.

EDIT: UNPACK AND USE TZX, DOESN'T RUN FROM ZIP
by dr beep
Thu Feb 27, 2020 6:13 pm
Forum: Emulators
Topic: A new ZX81 Emulator
Replies: 9
Views: 2227

Re: A new ZX81 Emulator

I think the only thing you need to do is to emulate a correct read of a IN port. After that the original code can do the job after disabling the calls to upper memory for display (done the same on the SAM-coupe) This needs a routine that checks the keys read by each reset bit from the ports. I don't...
by dr beep
Wed Feb 26, 2020 5:53 am
Forum: Emulators
Topic: A new ZX81 Emulator
Replies: 9
Views: 2227

Re: A new ZX81 Emulator

Help offered......
by dr beep
Tue Feb 25, 2020 10:19 pm
Forum: Emulators
Topic: A new ZX81 Emulator
Replies: 9
Views: 2227

Re: A new ZX81 Emulator

Problems you might get 1) ROM-bug. Can you protect #0000-#1FFF against writing? If not, first addresses will be overwritten. 2) Reading IN-port (result can be different from machine you run or ZX81. Can be fixed with a scan and RST. 3) My games with "hidden" data on screen, can be emulated with corr...
by dr beep
Tue Feb 25, 2020 9:33 pm
Forum: Emulators
Topic: A new ZX81 Emulator
Replies: 9
Views: 2227

Re: A new ZX81 Emulator

Hello All, I am using the NMI to jump to my emulator which copies the D_FILE to the Adam's video processor and allows me to debug as needed. That is the same way I coded SAM81, the ZX81 emulator for the SAM Coupe. It was coded in 1/2 day using the display from the ZX81EMUL for the ZX Spectrum I was...
by dr beep
Tue Feb 25, 2020 9:16 pm
Forum: Emulators
Topic: A new ZX81 Emulator
Replies: 9
Views: 2227

Re: A new ZX81 Emulator

Andy Rea wrote:
Tue Feb 25, 2020 7:46 pm
not sure what happens when multiple keys are pressed...
Multiple keys return a NO KEY PRESSED, it ignores the input.
by dr beep
Mon Feb 03, 2020 12:35 pm
Forum: GAMES
Topic: New ZX81 Games
Replies: 164
Views: 157376

New ZX81 Games : GAME 74 in 1K hires

Name of Software: Cylon Attack Author: Johan "Dr Beep" Koelman Release Date: 03/02/2020 Requirements (eg. 1K, 16K, AY Card, Hi-Res Scheme): 1K hires Description: Shoot Cylons before they reach you cylon.gif Download link (if available for download): cylon.p Commercial / Public Domain / Free ware / O...