Commodore PET User Manual page 435

Table G-l. PET Memory Map (Rev 2 ROMs) (Continued)
Memory Address Sample Value
Description
Decimal Hexadecimal Decimal Hexadecimal
57344-59391 EOOO-E7FF
Screen Editor
Starting Address
Function
57416 E048 ATN
57525 E085 Initialize 8ASIC
system
57910 E236 Clear screen
57981 EnD Character letch
58004-58986 E294-E66A
Video driver
58282 E3AA Scroll processor
58346 E3EA Video display routine
58185 E349 Ouote mode I$EA)
switcher
58346 E3EA
Print character
58713 E559 Scroll 1 line
58758 E586
Interrupt Request
(lROI
58987-59012 E668-E684
Interrupt handler
59013-59198 E685-E73E Clock update
59199-59227 E73F-E758 Keyboard scan
59228-59348 E75C-E7D4 Keyboard encoding table
Page 233-240 1/0 Ports and Expansion 1/0 IPIA's and VIAl 159392-614391
Keyboard PIA (59408-69411)
59408 E810
233
E9
1/0 Port A and Data Direction register
59409 E811
60
3C
Control Register A - screen blanking
52=Screen off Iblanked)
60=Screen on
59410 E812
255
FF 1/0 Port 8 and Data Direction register
255=all keys except:
254=RVS key
253=key
251=SPACE key
247=
<
key
59411 E813
61
3D Control Register 8 -
*
1 cassette motor
53=motor on
61 =motor off
IEEE Port PIA (69424-69427)
59424 E820
255
FF 1/0 Port A and Data Direction register
PEEK (59424) reads input data.
59425 E821
188
8C
Control Register A - set output line CA2
POKE 59425.52=low
POKE 59425.60=high
59426 E822
255
FF 1/0 Port 8 and Data Direction register
POKE 59426,data writes output data
POKE 59426.255 belore a read ta Port A
59427 E823
60
3C Control Register 8 - set output line C82
POKE 59427.52=low
POKE 59427.60=high
422