| C8BC
to C8DB |
A subroutine which deals with the minus
sign. Entering at C8C4 negates the current slot on the
workspace sack cf:
15
24
33
42, X |
= |
0 |
- |
15
24
33
42, X |
|
| C8DC
to C8F7 |
A subroutine to deal with variable
assignments. Entering at C8E3 will copy any simple
variable pointed at by Y (Y=1 is A, 2 is B etc.) to the
current slot on the workspace stack (as given by ?4). See
example program at the back. This is the opposite of CA2F |
| C8F8
to C901 |
Deals with numeric assignments. |
| C902
to C909 |
Executes the ABS function. This can be
used by pointing at the item you want ABSed with 5,Y. The
result is placed on the workspace stack. |
| C90A
to C943 |
Deals with the # sign (hex number sign) |
| C944
to C94B |
Deals with the ( sign (left bracket) |
| C94C
to C95E |
Deals with the ? as a PEEK function |
| C95F
to C972 |
Deals with the ! as a quad-PEEK function |
| C973
to C985 |
A subroutine that reads TOP value at
vector (D,E) onto the current workspace stack, and
increments the workspace stack pointer. |
| C97A
to C985 |
A subroutine which reads the current
COUNT value (?7) to the current slot of the workspace
stack. |
| C986
to C9BC |
A subroutine to execute RND. It
generates a new random number at 8 to C, copies it to the
current slot of the workspace stack, and increments the
workspace stack pointer (?4), which you MUST reset. This
can be used by you to generate random numbers in a
machine code program (see example, chapter 6). |
| C9BD
to C9D1 |
Executes the LEN function. |
| C9D2
to C9D7 |
Deals with the CH operator. |
| C9D8
to C9E6 |
BRK handler. The 6502 executes a BRK
instruction it is directed here through the vector in
202,203, normally set by the operating system immediately
before executing a direct mode command. Its effect is to
point the BASIC interpreter at the vector 10,11, normally
C9E7. Exits to direct mode. |
