Commodore CBM - Page 356

Table 6-2. PET Memory Map (Rev. 3 ROMs) (Continued)
Memery AdtIre8.
Sample Value
Description
Decimal Hexadecimal Decimal Hexadecimal
Screen Editor
Sterting Addr •••
Function
57344-5391 EOOO-E7FF
" 57384 E028
TAN
57484
E08C ATN
57593
EOF9 Subroutine ta be moved ta
page 0 ($70-$871
57617
Elll
Initial RND seed (5 bytes)
57622 E116
Initialize BASIC system
57897 E229 Clear screen
57943 E257 Home cursor
57989 E285 Character fetch
58100-58906
E2F4-E61A
Video driver
58100
E2F4 Input fram screen
58175
E33F Ouate mode ($CDlswitcher
58188
E34C Print character
58687
E53F Serail 1 line
58907-59113
E61B-E6E9 Interrupt Handler
59114-59127
E6EA-E6F7 Keyboard
Scan
59128-59241
E6F8-E769 Keyboard Encoding Table
59242-59391
E76A-E7FF
Subroutines for Machine Language Monitor
Page 233-240 1/0 Ports and Expansion 1/0 IPIA's and VIA) 159392-61439)
Keyboard PIA
(59408-59411)
59408
EB10
249
F9
1/0 Port A and Data Direction register
59409
E811
60
3C
Control Register A - screen blanking
52~Screen off (blanked)
60-Screen on
1/0 Port B and Data Direction register
59410
E812
255
FF
255=all keys except:
254-RVS key
253=[ key
251 =SPACE key
247~< key
Control
Reg isters B - *' 1 cassette motor
59411
E813
61
3D
53=motor on
61=motor off
IEEE Port PIA (59424-59427}
59424
E820
255
FF
1/0 Port A and Data Direction register
PEEK (59424) reads input data
59425
E821
188
BC
Control Register A - set output line CA2
POKE 59425.52~low
POKE 59425.60=high
59426
E822
255
FF
1/0 Port B and Data Direction registers
POKE 59426. data writes output data
POKE 59426.255 before a read ta Port A
59427
E823
60
3C
Control Register B - set output line CB2
POKE 59427.'52-low
POKE 59427.60=high
343