VIC data and color RAM

Hi!

I was investigating Robert Willie's (aka Hydrophilic) explaining twice availability of VIC2E Color RAM...

Really it needs to write that in Basic is it impossible but few POKE commands I tried.

VIC and CPU can access areas separatelly

$01 / bit 0 = 0 (CPU access Color RAM 0 / mc-bitmap)

$01 / bit 0 = 1 (CPU access Color RAM 1 / text)

$01 / bit 1 = 0 (VIC access Color RAM 0 / mc-bitmap)

$01 / bit 1 = 1 (VIC access Color RAM 1 / text)


Here are POKE commands to use all choices:

00 = poke1,peek(1)and252

01 = poke1,(peek(1)and252)or1

10 = poke1,(peek(1)and252)or2

11 = poke1,(peek(1)and252)or3

It's all about VIC Color RAM which is not available in banks 0 and 1. But really not true VIC area, really CPU RAM is VIC DATA RAM - better to say default 1024 - 2023 is possible use in both banks by simple switch:

pokedec("d506"),peek(dec("d506"))and191:rem vic ram in bank 0

pokedec("d506"),peek(dec("d506"))or64:rem vic ram in bank 1


Really in Basic is it not possible to use 'cause Kernal controls all, even also VIC registers have their shadows...
In assembler is it perfect like buffer, for example:
before any change in text editing you save data to bank 1, type anything, or scrolling will erase lines above, you can press keystroke, e.g. CTRL+Z and it move buffer 1024-2023 from bank 1 to bank 0 back and it looks really like UNDO...

I don't know if it is explained understandeable, if not please correct me Robert...

Miro