Search found 1305 matches

by dr beep
Thu Dec 03, 2020 8:28 pm
Forum: Hardware
Topic: Minstrel 3 with some 1K games
Replies: 5
Views: 147

Re: Minstrel 3 with some 1K games

the problem that still occurs is that the game stores invisible data on the screen. This data executes commands during display. This is what might go wrong on a minstrel. Same happens in 1K hires games.
by dr beep
Thu Dec 03, 2020 8:25 pm
Forum: GAMES
Topic: 1k Games
Replies: 4
Views: 105

Re: 1k Games

AN7805 wrote: Thu Dec 03, 2020 2:20 am Hi at all,

where i can find here or a list on the web to download,
1k game p.files? Is 1k Hi-res WRX game are compatible
with the ZX81 at 1k memory?

Thanks,

Matt :-)
here
https://sinclairzxworld.com/viewtopic.p ... 584#p36584

and after game 60 in the new games topic.
by dr beep
Tue Dec 01, 2020 7:23 pm
Forum: Hardware
Topic: Minstrel 3 with some 1K games
Replies: 5
Views: 147

Re: Minstrel 3 with some 1K games

what all games might have in common is that during display code is executed, that is upper memory is called for display and opcodes with bit 6 set are executed.
by dr beep
Tue Dec 01, 2020 7:21 pm
Forum: Hardware
Topic: Minstrel 3 with some 1K games
Replies: 5
Views: 147

Re: Minstrel 3 with some 1K games

Mine1K (do you mean minesweeper)

is not hires but uses hidden data on the screen with bit 6 set.

You must see spaces but on the screen commands like ld d.b and so on are executed.

Many of my games use this trick, also Lode Runner, Pathmaze and Snake
by dr beep
Tue Nov 17, 2020 10:41 pm
Forum: Welcome Area
Topic: Hello from SheddyIan (currently in the spare room)
Replies: 4
Views: 337

Re: Hello from SheddyIan (currently in the spare room)

welcome,

you have a lot of games to pick up after you left....

did you try some of my 1K hires games?
(available in the new games section)
You might like them.

Johan "dr beep" Koelman
by dr beep
Thu Nov 12, 2020 9:13 pm
Forum: Welcome Area
Topic: New to Sinclair
Replies: 6
Views: 261

Re: New to Sinclair

Welcome, have fun finding out what your computers are capable of.
by dr beep
Fri Nov 06, 2020 9:22 pm
Forum: Software
Topic: Need help working something out.
Replies: 12
Views: 357

Re: Need help working something out.

ld hl,16513
ld bc,0
loop:
inc hl
ld a,(hl)
cp 29
jr nz,cont
inc bc
cont:
cp 118
jr nz,loop
ret
by dr beep
Sun Nov 01, 2020 2:55 pm
Forum: Software
Topic: Drop the PRINT instruction on ZX80
Replies: 8
Views: 727

Re: Drop the PRINT instruction on ZX80

The command makes sense, the result of the printing is only displayed when the boolean result from the USR call is true, which it is when BC >0. However the PRINT itself wil print nothing even when BC >0, the ; will keep the cursor on the same line and not to the next line. Your problem is different...
by dr beep
Sat Oct 31, 2020 8:47 pm
Forum: Software
Topic: Drop the PRINT instruction on ZX80
Replies: 8
Views: 727

Re: Drop the PRINT instruction on ZX80

LET A=USR 30000

or

PRINT “” AND USR 30000;
by dr beep
Fri Oct 16, 2020 10:07 pm
Forum: Emulators
Topic: Zeddy emulator for ZX Spectrum
Replies: 17
Views: 14585

Re: Zeddy emulator for ZX Spectrum

Paul wrote: Fri Oct 16, 2020 7:06 pm
dr beep wrote: Fri Oct 16, 2020 4:09 pm I only know SLOWLOADER which loads a ZX81 program and will add
REM to the not working commands.
Yes I had bought that as an original.
It worked quite well.
But as most programs for ZX81 had MC these would not work.
So an emulator (hardware or software) is the only solution.