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Add example basic prg

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Gregor Riepl 2022-08-20 20:26:02 +02:00
parent 71d7461031
commit 5508e77589
1 changed files with 21 additions and 1 deletions
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README.md
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@ -30,7 +30,7 @@ The other pin mappings are as follows:
| PET pin | ESP pin | Direction | Cassette 1 external | Cassette 2 internal | | PET pin | ESP pin | Direction | Cassette 1 external | Cassette 2 internal |
|----------------|---------|-----------|---------------------|----------------------| |----------------|---------|-----------|---------------------|----------------------|
| Cassette Write | RXD | PET->ESP | VIA PB3 | VIA PB3 (same as #1) | | Cassette Write | RXD | PET->ESP | VIA PB3 | VIA PB3 (same as 1) |
| Cassette Read | TXD | ESP->PET | PIA1 CA1 | VIA CB1 | | Cassette Read | TXD | ESP->PET | PIA1 CA1 | VIA CB1 |
| Cassette Motor | CTS | PET->ESP | PIA1 CB2 | VIA PB4 | | Cassette Motor | CTS | PET->ESP | PIA1 CB2 | VIA PB4 |
| Cassette Sense | RTS | ESP->PET | PIA1 PA4 | PIA1 PA5 | | Cassette Sense | RTS | ESP->PET | PIA1 PA4 | PIA1 PA5 |
@ -87,3 +87,23 @@ Input parameters and return values for `rs_read` and `rs_write` are exchanged vi
| `rs_available` | $ed | Available bytes to read or write (size of the input buffer or remaining space in output buffer) | | `rs_available` | $ed | Available bytes to read or write (size of the input buffer or remaining space in output buffer) |
| `rs_data` | $ee | Data byte (return from read or parameter for write) | | `rs_data` | $ee | Data byte (return from read or parameter for write) |
| `rs_status` | $ef | Status of the operation (0=ok, 1=read buffer empty, 2=write buffer full, 3=not initialized, 4=already initialized) | | `rs_status` | $ef | Status of the operation (0=ok, 1=read buffer empty, 2=write buffer full, 3=not initialized, 4=already initialized) |
## Example BASIC Program
This program assumes that the driver is already loaded at start address $7000.
```basic
10 PRINT "Initializing driver"
20 SYS (28672)
30 PRINT "Waiting for input"
40 SYS (28678)
50 status = PEEK(239)
60 IF status <> 0 THEN GOTO 90
70 char = PEEK(238)
80 PRINT CHR$(char);
90 GOTO 40
100 PRINT
110 PRINT "Disabling driver"
120 SYS (28675)
130 END
```