Commodore PET User Manual page 351

Table 6-2. PET Memory Map (Rev. 3 ROMs) (Continued)
Memory Address Semple Value
Description
Decimal
Hexadecimal
Decimal
Hexadecimal
216
0008
24
18
Line number where cursor is flashing 10-241
217
0009 10
OA 1/0 storage: last key input. buffer
checksum. bit buffer
218-219 OODA-OODB 0
0000 Pointer to current file name
220
OODC
0
00
Number of Insert keys pushed to 90
221 0000
0 00 Seriai bit shift word
222
OODE
0
00
Number of blocks remammg to
read/write
223
OODF
0
00
Seriai word buffer
224-248 00EO-00F8
High byte of screen Ime addresses
128
80
224-230~128
lIines 1-7)
129
81
231-236~129
lIines 8-13)
130
82
237-243~130
lIines 14-20)
131
83
244-248~131 limes 21-25)
249 00F9
0 00 Cassette * 1 status switch
250
OOFA
0
00 Cassette *2 status switch
251-252
OOFB-OOFC
54144
0380 Tape start address
253-255 OOFD-OOFF 243
F3 Utllity
Page 1 (256-511)
256-up
0100-up
32 20 Tape read working storage (up to 5111 and
conversion storage
256-318 For errar correction in tape reads
(62 bytesl
256-266 Binary to ASCII
conversIOn
III bytesl
511-down 01FF-down
44 2C Stack (down to 2561
Page 2-3 (512-1023)
512-592
0200-0250
BASIC input Ime buffer 180 bytes)
12597
3135
512-513 0200-0201 Program Counter
50
32
514
0202 Processor status
0 00
515 0203 Accumulator
171
AB 516 0204 X index
0 00 517 0205 Y index
0 00
518 0206 Stack pointer
15104 3800 519-520
0207-0208 User modifiable IRQ
593-602 0251-025A
4 04 Table of loglcal numbers of open files
603-612 025B-0264
4 04 Table of device numbers of open files
613-622 0265-026E
255 FF
Table of secondary address modes of open
files
623-632
026F-0278
3 03 Keyboard buffer 110 bytes)
633
0279
28
lC
Keyboard utility
634-825
027A-0339
28
lC
Tape buffer for cassette *1 (192 bytes)
826-1017 033A-03F9
173 AD Tape buffer for cassette *2 (192 bytes)
1018-1019 03FA-03FB
59383 E7F7 Vector for Machine Language Monitor
1020-1023
03FC-03FF
195 C3 Utility space/unused
338