Search found 930 matches

by mrtinb
Sat Jun 22, 2019 5:27 pm
Forum: Welcome Area
Topic: Hello from North-East England!
Replies: 5
Views: 124

Re: Hello from North-East England!

And if you’re cross compiling on a pc, you can use C as well.

https://github.com/z88dk/z88dk/wiki/Pla ... clair-ZX81
by mrtinb
Fri Jun 21, 2019 3:23 pm
Forum: Welcome Area
Topic: Hello from North-East England!
Replies: 5
Views: 124

Re: Hello from North-East England!

On the programming part you get very far in BASIC with the ZX81 manual. http://www.worldofspectrum.org/ZX81BasicProgramming/ If you have games in mind, the real alternative is Z80 assembler . If you don't know Z80 assembler, a simple intro is given in the children's assembler programming book from b...
by mrtinb
Fri Jun 21, 2019 2:06 pm
Forum: Software
Topic: Anyone recognise these custom graphics?
Replies: 5
Views: 110

Re: Anyone recognise these custom graphics?

Maybe the 2x 64 characters are RAM based, so it's just random garbage?
by mrtinb
Mon Jun 17, 2019 10:17 pm
Forum: Software
Topic: Memotech Z80 Assembler question
Replies: 26
Views: 1159

Re: Memotech Z80 Assembler question

My understanding of the ZX81 is: Keyboard is never read in FAST mode.

This is no problem in BASIC, because when program gets to INPUT or INKEY$ it switches over, at reads the keyboard.

In machine language in FAST mode, the keyboard is never read, unless you create your own routine for it.
by mrtinb
Mon Jun 17, 2019 4:46 pm
Forum: Emulators
Topic: sz81 emulator
Replies: 10
Views: 522

Re: sz81 emulator

It seems the macOS download only includes the standard version.

Could you kindly include the ZXpand and ZXmore version with the macOS package as well?
by mrtinb
Sun Jun 16, 2019 10:48 pm
Forum: Software
Topic: Memotech Z80 Assembler question
Replies: 26
Views: 1159

Re: Memotech Z80 Assembler question

I've actually tried for weeks to enter FAST mode while auto-inserting lines, because it's still very slow in SLOW mode. However this is much more complicated that I anticipated. Now the keyboard is not read anymore (because keyboard reading is part of SLOW routine). I have tried to add keyboard read...
by mrtinb
Thu Jun 13, 2019 9:41 am
Forum: Hardware
Topic: White screen and no cursor at all
Replies: 38
Views: 1559

Re: White screen and no cursor at all

Great! :)
by mrtinb
Thu Jun 13, 2019 7:05 am
Forum: Development
Topic: New hardware I/O board using Parallax Propeller
Replies: 14
Views: 575

Re: New hardware I/O board using Parallax Propeller

The connector is not made any longer. So we all buy ISA connectors and cut them to the right size.
by mrtinb
Wed Jun 12, 2019 10:58 pm
Forum: Emulators
Topic: sz81 emulator
Replies: 10
Views: 522

Re: sz81 emulator

GCHarder wrote:
Wed Jun 12, 2019 10:09 pm
Besides the standard ZX81 (sz81), it now has support for Chroma, ZXPand (sz81p) and ZX81NU (sz81n), I don't know what sz81m does.
Acording to the manual, I think it's ZXmore.
by mrtinb
Wed Jun 12, 2019 10:39 pm
Forum: Development
Topic: New hardware I/O board using Parallax Propeller
Replies: 14
Views: 575

Re: New hardware I/O board using Parallax Propeller

Seems like someone already made ZX81 VGA output with a Propeller.

http://zx81vga.ws-nbg.de/main.php