| Splitting the Atom |
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page 21 |
| F7EC
to F81C |
Subroutines to print the hex value of
words (4 bytes), vectors (2 bytes) and single bytes.
On return X is spoiled, but A and Y preserved.
F7EE - print in hex a word in order X+1, X, X+3, X+2.
F7F1 - print in hex a vector (X+1,X)
F7FA - print byte in accumulator plus a space.
F802 - print in hex the byte in the accumulator. |
| F818
to F84E |
A subroutine (use by *LOAD, *SAVE etc.),
which copies a string enclosed in quotes in the 100 input
buffer to the string area starting at 140. Y should point
to the beginning of the input string. X,Y, and the
accumulator are spoiled. |
| F86C
to F874 |
Print "NAME", then BRK. |
| F875
to F87D |
A subroutine to fetch the next non-space
character from the direct mode input buffer at 100,Y. On
return, Y points to the character fetched. |
| F87E
to F892 |
A subroutine which converts the value in
the accumulator from a valid ASCII hexadecimal character
to its hexadecimal value. If the contents of the
accumulator were not a valid hexadecimal character the
routine returns with the accumulator unchanged, and the
carry flag set. Otherwise, the accumulator contains the
true hex value and the carry flag is clear. |
| F893
to F8BD |
A subroutine which reads the ASCII
hexadecimal value in the direct mode input buffer at
100,Y as a vector (two bytes or 4 characters) to the
location pointed to by X on entry to the routine, e.g.:
Y=position of the 1st character in the buffer, lets say
it points at the A of A147
X=#80
After JSR F893, then 80,81 = A147. If the first character
in the buffer was invalid, then the zero flag is set on
return. |
| F8BE
to F8ED |
Tables of *COS reserved words and their
action addresses.
These are CAT, LOAD, SAVE, RUN, MON, NOMON, FLOAD, and
DOS. |
| F8EF
to F925 |
*COS interpreter subroutine called by
OSCLI. It looks for a match between a word in the direct
mode input buffer at 100,Y and the reserved words
starting at F8BE. It jumps to the correct action address
if a match is found. |
| F926
to F92E |
Default routine for unknown *COS
command, which prints "COM" and then ERROR 48. |
| F955
to F96D |
Executes the *FLOAD and *LOAD commands.
F955 = *FLOAD, and F958 = *LOAD.
The routine exits via (20C), the LODVEC, which is
normally set to F96E. |
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