Search found 949 matches

by mrtinb
Thu Jul 18, 2019 7:40 am
Forum: Sinclair Misc
Topic: Why did Sinclair resist Floppy drives for it's computers ?
Replies: 3
Views: 90

Re: Why did Sinclair resist Floppy drives for it's computers ?

If you look at the continents across all brands, there’s a trend. E.g. with Commodore users in US had floppy; users in EU had tape. Therefore software in US was primarily on disk, and software in EU was primarily on tape. And because Sinclair was a European country, it had the European thinking that...
by mrtinb
Fri Jul 12, 2019 12:08 pm
Forum: Hardware
Topic: Using a Kempston Joystick Interface with a ZX81
Replies: 3
Views: 179

Re: Using a Kempston Joystick Interface with a ZX81

So if someone just want the real thing, one just appeared on eBay: https://www.ebay.com/itm/153561929093
by mrtinb
Mon Jul 08, 2019 11:12 pm
Forum: Software
Topic: UnLock Software*SOLVED*
Replies: 11
Views: 256

Re: UnLock Software

If you want to load a program that’s more than 16k you need to change RAMTOP before load, otherwise the load fails.

This might not be a problem on all emulators, because they want to “help” you. However it will not work on real hardware, if RAMTOP has not been changed prior to load.
by mrtinb
Sun Jul 07, 2019 10:46 pm
Forum: Software
Topic: UnLock Software*SOLVED*
Replies: 11
Views: 256

Re: UnLock Software

If you have a ZXpand, you can load the software with LOAD “SOFTWARE STOP ”, where STOP is a keyword. ZXpand emulation is available on EightyOne as well.

If you have real hardware with tape loading, I’ve read you can load with RAND USR 836 to stop auto-run. (This I’ve never tried myself.)
by mrtinb
Fri Jul 05, 2019 5:25 pm
Forum: Sinclair Misc
Topic: Which is better? Spectrum or other....
Replies: 15
Views: 503

Re: Which is better? Spectrum or other....

Will ZX81 hardware work with Spectrum or 2068? ZXpand or any other hardware that replaces the ROM needs a custom Spectrum or 2068 ROM. However the ROM on Spectrum is 16k, and e.g. ZXpand only supports 8k. (Maybe replacing the first 8k is ok, and just use the internal upper 8k from the Spectrum.) Nex...
by mrtinb
Thu Jul 04, 2019 6:27 pm
Forum: Hardware
Topic: Creating Wilf Rigter's ZXKBD v3
Replies: 52
Views: 8429

Re: Creating Wilf Rigter's ZXKBD v3

I just used 5 resistors in my circuit.
by mrtinb
Thu Jul 04, 2019 4:20 pm
Forum: Welcome Area
Topic: Greetings from Denmark
Replies: 2
Views: 364

Re: Greetings from Denmark

Velkommen.

We are a few from Denmark here already.

If you have some stuff for the ZX81 in Danish. I’ve scanned an issue of ZXdata’s Danish magazine ZinX, and posted it here in the forum.
by mrtinb
Thu Jul 04, 2019 4:13 pm
Forum: Hardware
Topic: Creating Wilf Rigter's ZXKBD v3
Replies: 52
Views: 8429

Re: Creating Wilf Rigter's ZXKBD v3

If you follow the schematic for joystick you will not get 5, 6, 7, 8 + 0.

This schematic will give you 6, 7, 8, 9, 0.

I would advice just to tap into the keyboard matrix to get any keys you want.
by mrtinb
Thu Jul 04, 2019 3:59 pm
Forum: Hardware
Topic: Creating Wilf Rigter's ZXKBD v3
Replies: 52
Views: 8429

Re: Creating Wilf Rigter's ZXKBD v3

I just shorted wires one by one to find the key.