| Address |
Function |
| 00 |
Error
number in BASIC |
| 01-02 |
Line
number in BASIC, 0 means Direct Mode (as MSB, LSB in
Binary, not BCD) |
| 03 |
BASIC
text pointer offset |
| 04 |
Workspace Stack Pointer |
| 05-06 |
BASIC text pointer: (5),3
points at character |
| 07 |
COUNT
value |
| 08-0C |
Random
number seed |
| 0D 0E |
TOP:
points to top of BASIC text area. |
| 10 11 |
Pointer
to BASIC error handler |
| 12 |
BASIC
text area MSB (page), normally #29 |
| 13 |
DO / UNTIL stack pointer |
| 14 |
GOSUB / RETURN stack pointer |
| 15 |
FOR / NEXT stack pointer |
| 16-24 |
LSB |
Integer
Workspace stack |
| 25-33 |
|
| 34-42 |
|
| 43-51 |
MSB |
| |
23,24 |
DIM (free space) pointer |
| |
32,33 |
DATA pointer for DISATOM |
| 52-6F |
Arithmetic workspace |
| 70-7F |
Floating-point workspace
(free if FP unused) |
| 80-AF |
Free |
| B0-FF |
COS workspace |
| |
C9 |
Title string of file to load from tape |
| |
DD |
*FLOAD flag. Set if bit 7 = 1 |
| |
DE,DF |
Cursor position pointer (start of line) |
| |
E0 |
Horizontal cursor position, 0 to 1F |
| |
E1 |
Cursor mask, usually #80 |
| |
E6 |
Page modeflag: neg.=OFF, else no. of lines left |
| |
E7 |
Lock key flag: 0=inactive, #60 = lock on |
| |
EA |
Normally 0. If not, then *NOMON engaged |
| |
FE |
Character NOT sent through VIA to printer |
| 100 13F |
Input line buffer |
| 140 17F |
BASIC
Input buffer and string operation area |
| 180 1FF |
Microprocessor
Stack |
| 200 201 |
NMIVEC |
|
| 202 203 |
BRKVEC |
C9D8 |
| 204 205 |
IRQVEC |
A000; just RTS |
| 206 207 |
COMVEC |
F8EF |
| 208 209 |
WRCVEC |
FE52 |
| 20A 20B |
RDCVEC |
FE94 |
| 20C 20D |
LODVEC |
FE6E |
| 20E 20E |
SAVVEC |
FAE5 |
| 210 211 |
RDRVEC |
C2AC; just BRK |
| 212 213 |
STRVEC |
C2AC; just BRK |
| 214 215 |
BGTVEC |
FBEE |
| 216 217 |
BPTVEC |
FC7C |
| 218 219 |
FNDVEC |
FC38 |
