Commodore PC 40 - Page 54

38 Operations Guide
40 x 25 Alphanumeric mode
In this submode, each page or display screen uses 1 K (40 x 25)
bytes of character and lK bytes of attributes. That means there are
8
pages available. Their addresses are:
Page 0:
b8000 - b87ff
Page 1: b8800 - b8fff
Page 2:
b9000 - b97ff
Page 3: b9800 - b9fff
Page 4:
baOOO - ba7ff
Page 5:
ba800 - bafff
Page 6:
bbOOO - bb 7ff
Page
7: bb800 - bbfff
80 x 25 Alphanumeric Mode
There are four pages of display data in this submode. Their
addresses are:
Page 0:
b8000 - b8fff
Page
1: b9000 - b9fff
Page
2: baOOO - bafff
Page 3:
bbOOO - bbfff
Medium Resolution Color/Graphics Mode (320 x 200)
In this submode, a page requires 16K bytes of memory. Therefore,
only 1 page is available. Its address is:
b8000 - bbfff
The graphics storage is organized in 2 banks of 8K bytes, using the
following format:
b8000
b9f3f
baOOO
bbf3f
bbfff
Even scans lines
0,2,4,
... ,198
not used
Odd scans lines
1,3,5,
... ,199
not used
High Resolution Black and White Graphics Mode (640 x 200)
In this submode, the memory organization is the same as the
medium resolution Color/Graphics mode.