Classic Computer Magazine Archive COMPUTE! ISSUE 20 / JANUARY 1982 / PAGE 181

VIC Memory Map Above Page Zero

Jim Butterfield Toronto, Canada

Editor's Note: Next month we'll have a VIC zero page map and Jim's comments on the VIC's memory.RTM

0100–103E 256–318 Tape error log
0100–01FF 256–511 Processor stack area
0200–0258 512–600 Basic input buffer
0259–0262 601–610 Logical file table
0263–026C 611–620 Device # table
026D–0276 621–630 Sec Adds table
0277–0280 631–640 Keybd buffer
0285 645 Serial bus timeout flag
0286 646 Current color code
0287 647 Color under cursor
0288 648 Screen memory page
0289 649 Max size of keybd buffer
028A 650 Repeat all keys
028B 651 Repeat speed counter
028C 652 Repeat delay counter
028D 653 Keyboard Shift/Control flag
028E 654 Last shift pattern
028F–0290 655–656 Keyboard table settup pointer
0291 657 Keymode (Kattacanna)
0292 658 0=scroll enable
0293 659 VIC chip control
0294 660 VIC chip command
0295–0296 661–662 Bit timing
0297 663 RS-232 status
0298 664 # bits to send
0299–029A 665 RS-232 speed/code
029B 667 RS232 receive pointer
029C 668 RS232 input pointer
029D 669 RS232 transmit pointer
029E 670 RS232 output pointer
029F–02A0 671–672 IRQ save during tape I/O
0300–0301 768–769 Error message link
0302–0303 770–771 Basic warm start link
0304–0305 772–773 Crunch Basic tokens link
0306–0307 774–775 Print tokens link
0308–0309 776–777 Start new Basic code link
030A–030B 778–779 Get arithmetic element link
0314–0315 788–789 Hardware interrupt vector (EABF)
0316–0317 790–791 Break interrupt vector (FED2)
0318–0319 792–793 NMI interrupt vector (FEAD)
031A–031B 794–795 OPEN vector (F40A)
031C–031D 796–797 CLOSE vector (F34A)
031E–031F 798–799 Set-input vector (F2C7)
0320–0321 800–801 Set-output vector (F309)
0322–0323 802–803 Restore I/O vector (F3F3)
0324–0325 804–805 INPUT vector (F20E)
0326–0327 806–807 Output vector (F27A)
0328–0329 808–809 Test-STOP vector (F770)
032A–032B 810–811 GET vector (F1F5)
032C–032D 812–813 Abort I/O vector (F3EF)
032E–032F 814–815 USR vector (FED2)
0330–0331 816–817 LOAD link
0332–0333 818–819 SAVE link
033C–03FB 828–1019 Cassette buffer
0400–0FFF 1024–4095 3K RAM expansion area
1000–1FFF 4096–8191 Normal Basic memory
2000–7FFF 8192–32767 Memory expansion area
8000–8FFF 32768–36863 Character bit maps
9000–900F 36864–36879 Video Interface Chip
9110–912F 37136–37167 6522 Interface Chips
9400–95FF 37888–38399 Alternate Colour Nybble area
9600–97FF 38400–38911 Main Colour Nybble area
A000–BFFF 40960–49151 Plug-in ROM area
C000–FFFF 49152–65535 ROM: Basic and Operating System
VIC Usage: The 6560 V. I. Chip

VIC Usage: The 6522-A

VIC Usage: The 6522-B