Commodore VIC-20 User Manual page 312

298
The VIC 20 User Guide
TABU
B-1:
Memory Map (continued)
Hex
Decimal
Description
Address
Address
009F 159
Tape Pass 2 error log corrected
00AO-OOA2 160-162 Jiffy Clock (HML)
00A3
163
Serial bit count/ EO! flag
00A4 164
Cycle count
00A5 165
Countdown, tape write/bit count
00A6 166 Pointer: Tape buffer
00A7 167 Tape Write ldr count/ Read pass/ inbit
00A8 168 Tape Write new byte/Read error/inbit
count
00A9
169 Write start bit/ Read bit err / stbit
OOAA
170
Tape Scan;Cnt;Ld;End/byte assy
OOAB 171 Write lead length/ Rd checksum/ parity
OOAC-OOAD
172-173
Pointer: Tape buffer, scrolling
OOAE-OOAF 174-175 Tape end addresses/ End of program
OOBO-OOBI 176-177 Tape timing constants
00B2-00B3 178-179
Pointer: Start of tape buffer
00B4
180
Tape timer (I = enable); bit count
OOBS 181 Tape EOT / RS-232 next bit to send
00B6 182 Read character error/ outbyte buffer
00B7 183
# characters in file name
00B8 184 Current logical file
00B9 185
Current secondary address
OOBA 186 Current device
OOBB-OOBC 187-188
Pointer: To file name
OOBD
189
Write shift word/ Read input char
OOBE 190 # blocks remaining to Write/ Read
OOBF 191
Serial word buffer
OOCO 192
Tape motor interlock
00CI-00C2 193-194 I/O start addresses
00C3-00C4 195-196
KERNAL setup pointer
OOCS
197
Current key pressed
00C6 198
# chars in keyboard buffer
00C7
199
Screen reverse flag
00C8 200
Pointer: End-of-line for input
00C9-00CA 201-202
Input cursor log (row, column)
OOCB 203 Which key: 64 if no key