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PMODE 4 Video Memory
Posted: Sat Oct 25, 2025 10:21 am
by Vyper68
Is it possible to setup a PMODE4 Hires screen and poke a value into screen memory? I tried it and it didn't seem to work. I tried poking the value 170 into 1536 to 1536+512 and Step 8 hoping to get a bit pattern of 10101010 on the screen but it never appeared. I know I am missing something but I am very rusty with Dragon/CoCo BASIC and the graphics screens.
Re: PMODE 4 Video Memory
Posted: Sat Oct 25, 2025 10:32 am
by sixxie
If you're running with a disk system (or emulating one), all the "normal" video addresses move up by 1536 bytes, so if you're setting PMODE4,1 then try POKEing from 3072 on.
Re: PMODE 4 Video Memory
Posted: Sat Oct 25, 2025 5:00 pm
by Vyper68
Doh!!
Re: PMODE 4 Video Memory
Posted: Sat Oct 25, 2025 5:01 pm
by Vyper68
Doh!!
Re: PMODE 4 Video Memory
Posted: Sat Oct 25, 2025 5:01 pm
by Vyper68
Doh!!
Re: PMODE 4 Video Memory
Posted: Mon Oct 27, 2025 6:56 pm
by Vyper68
Sorry had some problems posting a reply.
Re: PMODE 4 Video Memory
Posted: Mon Oct 27, 2025 7:04 pm
by Vyper68
Does this apply to CoCo2's as well?