Commodore PET User Manual page 429

Table G-1. PET Memory Map (Rev 2 ROMs) (Continued)
Memory Address
Sample Value
Description
Decimal
Hexadecimal Decimal Hexadecimal
RAM Subroutines
194-199
00C2-00C7 230 E6
Routine to letch next BASIC character
200
OOCS 173 AD
Entry to reletch current character
201-202 00C9-00CA 1929 0789
Pointer to source text
203-223 OOCB-OODF 201 C9
Work area lor RND lunction
OS Page Zero Storage
224-225 OOEO-OOEl 33728 83CO
Pointer to start 01 line where cursor is
Ilashing
226 00E2 0 00
Column position where cursor is f1ash-
ing (0-79)
227-228 00E3-00E4 33792 8400
Utility pointer
229-230 00E5-00E6 1929 0789
End 01 current program
231-233 00E7-00E9 254 FE
Utility
234 OOEA 0 00
Fla9 lor quote mode. O=not quote mode
235-237
OOEB-OOED 192 CO
Utility
238
OOEE 0 00
No. 01 characters in current lile na me
239 OOEF
5 05
Current logical lile number
240 OOFO 255 FF
GPIB primary address
241 OOFl
63 3F
GPIB device number
242 00F2 39 27
Max. no. 01 characters on current line
(39.79)
243-244
00F3-00F4 634 027A
Pointer to start 01 current tape buffer
(634 or 826)
245
00F5 23
17 Line number where cursar is Ilashing
(0-24)
246 00F6 10
OA
lia storage
247-248
00F7-00F8
1024
0400
OS pointer to program
249-250 00F9-00FA 3100
OC1C Pointer to current lile name
251
OOFB
0
00 Number 01 Insert keys pushed to go
252
OOFC
9
09 Seriai bit shift word
253
OOFD
0
00
Number 01 blocks remalning to
read/write
254
OOFE
0
09 Seriai ward buller
255
OOFF 243 F3
Overflow byte lor binary to ASCII con-
verSions
Page 1 (256-5111
256-up
0100-up
32
20
Tape read working storage (up to 511)
and conversion stg.
256-318 For errar correction in tape
reads (62 bytes)
256-266 Binary to ASCII conversion
(11 bytes)
511-down 01 FF-down
0 00
Stack (down to 256)
Page 2-3 (512-1023)
OS Working Storage
512-514 0200-0202 3801352 3A0108
24-hour clock incremented every 1/60
second (jiffy). Resets every 5.184.000
jiffies (24 hours). Stored in low to
high order.
416