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My first ZX81
Posted: Tue Oct 27, 2020 11:31 pm
by AN7805
Arrived today.
Not working, i have repair the keyboard now is working perfectly.
Need only a heatsink for the ULA.
This is a ZX81 Issue 3 the ULA are the last produced, the 2C210E.
Matteo
Re: My first ZX81
Posted: Wed Oct 28, 2020 9:16 pm
by AN7805
A information,
where is the string for check the 1k memory?
Thanks,
Matt
Re: My first ZX81
Posted: Wed Oct 28, 2020 9:59 pm
by PokeMon
Not sure what you mean.
There is no command to check RAM.
You may use PRINT PEEK 16389 which gives 68 for 1k and 128 for 16k RAM. This is the dirty variant.
Code: Select all
PRINT PEEK 16389*256+PEEK 16388
PRINT PEEK 16389*256+PEEK 16388-16384
This should give RAMTOP address (first line) and RAM installed/available (second line).
Not sure if brackets are needed, dont think so.
Re: My first ZX81
Posted: Wed Oct 28, 2020 10:02 pm
by AN7805
Thank so much PokeMon.
Yes i said the string's you mean.
Thanks so much,
Matt
Re: My first ZX81
Posted: Fri Jun 24, 2022 5:25 pm
by jesperp
PokeMon wrote: ↑Wed Oct 28, 2020 9:59 pm
Not sure what you mean.
There is no command to check RAM.
You may use PRINT PEEK 16389 which gives 68 for 1k and 128 for 16k RAM. This is the dirty variant.
Code: Select all
PRINT PEEK 16389*256+PEEK 16388
PRINT PEEK 16389*256+PEEK 16388-16384
This should give RAMTOP address (first line) and RAM installed/available (second line).
Not sure if brackets are needed, dont think so.
This RAMTOP code also goes with Lambda 8300.
Re: My first ZX81
Posted: Fri Jun 24, 2022 8:07 pm
by dr beep
Here are some games to try in 1K.
https://sinclairzxworld.com/viewtopic.p ... res#p45132
Next link will be p2wav so you can load them as sound
viewtopic.php?p=1690#p1690