The BBC and Master Computer Public Domain Library
AE69 GET$
Submitted by Steve Fewell
Description:
Call OSRDCH operating system routine to wait for a key to be pressed on the keyboard
(if the keyboard buffer is empty) and return in A the next character read from the
Keyboard buffer.
Store the ASCII code for the Key pressed in the SWA (first position, &0600) and
set the SWA length (&36 to 1).
Exit with A=0 (as the result is a String).
Disassembly for the GET$ routine
| AE69 | 032 224 255 | 20 E0 FF | JSR &FFE0 OSRDCH | |
| AE6C | 141 000 006 | 8D 00 06 | STA &0600 | |
| AE6F | 169 001 | A9 01 | LDA#&01 | |
| AE71 | 128 028 | 80 1C | BRA 28 --> &AE8F Set SWA length (&36) to A & exit with A = 0 (result is a String value) |
Disassembly for the Set SWA length to A and exit with A = 0 routine
| AE8F | 6 | 133 054 | 85 36 | STA &36 |
| AE91 | 169 000 | A9 00 | LDA#&00 | |
| AE93 | ` | 096 | 60 | RTS |
