X and Y

A place to discuss the ZX80's and ZX81's younger brother - the Sinclair ZX Spectrum
Crayon21
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Re: X and Y

Post by Crayon21 »

is there an equivalent command for the zx81?
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XavSnap
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Re: X and Y

Post by XavSnap »

… On the Zx81 Basic ?
No…

With a UDG card, just redefine the right characters to display.
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Crayon21
Posts: 348
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Re: X and Y

Post by Crayon21 »

UDG card? Like an SD? I'm using an emulator not the physical hardware, and even if i could, they're almost $600

anyway, what do i do? what command?
In Heck, there are two options for perpetual torment:

Eat the Puckerberry and suffer for eternity:
drink nothing but a cocktail of The Last Dab and Mexican Cake blended and served with
habanero slices
:twisted:
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1024MAK
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Re: X and Y

Post by 1024MAK »

UDG card is an extra PCB that connects to the ZX81. The most common from the time of the ZX81 had various “UDG” in ROM. But the same PCB could have a RAM chip, and then you could design your own UDG. One limitation was that either the extra ROM or the extra RAM based UDG characters completely replaced the standard ROM character set.

The original UDG boards had to be fitted internally to a ZX81. However, the modern designs fit externally.

Mark
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Crayon21
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Joined: Sun Nov 04, 2018 2:33 am

Re: X and Y

Post by Crayon21 »

I'm trying to create a pong clone for the zx81. how do i get the graphics to move (I.E Like in 3D monster maze except this is 2D)
? I want to map the up and down keys to W and S or Up and Down respectively. any help would be appreciated. trying to fit in 2k
In Heck, there are two options for perpetual torment:

Eat the Puckerberry and suffer for eternity:
drink nothing but a cocktail of The Last Dab and Mexican Cake blended and served with
habanero slices
:twisted:
dr beep
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Re: X and Y

Post by dr beep »

Make the bats with a leading and ending blanc, then you don’t need to erase the bat on movement.
For speed use PRINT AT, also for ball but calculate which graphic is needed (4 possible).
You need to erase the ball before reprinting because it can move to another position.
Do not print ball on the bats but test before it is there and only print it when no bat is there to show a miss.
dr beep
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Re: X and Y

Post by dr beep »

Crayon21 wrote: Sun Nov 10, 2019 4:55 am I'm trying to create a pong clone for the zx81. how do i get the graphics to move (I.E Like in 3D monster maze except this is 2D)
? I want to map the up and down keys to W and S or Up and Down respectively. any help would be appreciated. trying to fit in 2k
2K must fit. I did it in 1K and hires.
https://m.youtube.com/watch?v=lbgyXvxuf6U
dr beep
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Re: X and Y

Post by dr beep »

1024MAK wrote: Sat Oct 26, 2019 10:11 pm UDG card is an extra PCB that connects to the ZX81. The most common from the time of the ZX81 had various “UDG” in ROM. But the same PCB could have a RAM chip, and then you could design your own UDG. One limitation was that either the extra ROM or the extra RAM based UDG characters completely replaced the standard ROM character set.

The original UDG boards had to be fitted internally to a ZX81. However, the modern designs fit externally.

Mark
USCII is a tool which allowes you to use UDG in BASIC without special hardware, only a RAM-pack capable of hires.
viewtopic.php?f=6&t=3124&p=33382&hilit=Uscii#p33382
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