Commodore 64 Manual de usuario descargar pdf (Pagina 4)

This 16K bank concept is part of everything that the VIC-II chip does.

You should always be aware of which bank the VIC-II chip is pointing

at, since this will affect where character data patterns come from,

where the screen is, where sprites come from, etc. When you turn on the

power of your Commodore 64, bits 0 and 1 of location 56576 are auto-

matically set to BANK 0

($0000-$3FFF) for all display information.

.NOTE: The Commodore 64 character set is not available to the VIC-II chip in BANKS

1 and 3. (See character memory section.)

SCREEN MEMORY

The location of screen memory can be changed easily by a POKE to

control register 53272 ($DOI8 HEX). However, this register is also used

to control which character set is used, so be careful to avoid disturbing

that part of the control register. The UPPER 4 bits control the location of

screen memory. To move the screen, the following statement should be

used:

POKE53272,(PEEK(53272)AND15)ORA

102 PROGRAMMING GRAPHICS

VALUE BITS BANK

STARTING

VIC-II CHIP RANGE

OF A

LOCATION

00 3 49152

($COOO-$FFFF)*

1 01 2

32768

($8000-$BFFF)

2 10

16384

($4000- $7FFF)*

3 11 0 0

($0000-$3FFF) (DEFAULT VALUE)

1 2 3 4 5 6 7 8 9 ... 82 83

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Commodore 64 Manual de usuario Pagina 4