Search found 1296 matches

by dr beep
Thu Apr 09, 2020 3:53 pm
Forum: Emulators
Topic: ZXSimulator for the Sinclair QL
Replies: 37
Views: 12693

Re: ZXSimulator for the Sinclair QL

My ZX81 emulator uses another way since I didn’t have so much memory on a ZX Spectrum. This is slower but still is the quickest way on a ZX Spectrum. Same routine is used on Galaksija-emulator for the SAM Coupe. Which one is your ZX81 emulator? Sorry if that's a dumb question. I'm newer to the ZX81...
by dr beep
Tue Apr 07, 2020 10:18 pm
Forum: Emulators
Topic: ZXSimulator for the Sinclair QL
Replies: 37
Views: 12693

Re: ZXSimulator for the Sinclair QL

So Z80 has 252 instructions and you are saying that using 2 bytes per for 252x256 which equals 64512 (or the full 256x256 for efficiency at a full 64K) so that each instruction is a memory address of the high byte (which means some memory is completely unused assuming not all opcodes need 256 bytes...
by dr beep
Mon Apr 06, 2020 10:26 pm
Forum: Emulators
Topic: ZXSimulator for the Sinclair QL
Replies: 37
Views: 12693

Re: ZXSimulator for the Sinclair QL

Oh that's very sad to hear. I've seen the Xtricator running and it looks like a very sophisticated and a polished piece of software. I was trying to run it on the Q68 but hadn't set up my directory environment properly. My ZXSimulator won't be as compatible as that since it won't emulate the Z80 an...
by dr beep
Sun Apr 05, 2020 10:19 am
Forum: Emulators
Topic: ZXSimulator for the Sinclair QL
Replies: 37
Views: 12693

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: 2368

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: 15545

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: 15545

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: 5479

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: 5479

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: 5479

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...