The printer can conveniently be connected to the uncommitted
PIO
chip supplied with Nascom 2 and 3. We suggest using a 25-way
D-type connector for this purpose. The wiring between this and
the Nascom 2 board should be carried out as described in
application note AN-005 (this connection is already made on
Nascom 3)
The connections between this D-type connector and the
printer should be ade as fol low
D-type
at comp.
| Function | From PL4
pin | Centronics
Connector |
|---|
| 1 | PIO B5/Printer data 5 | 1 | 7 |
| 2 | PIO B6/Printer data 6 | 3 | 8 |
| 3 | PIO B7/Printer data 7 | 5 | 9 |
| 7 | PIO A0/Printer busy | 13 | 11 |
| 8 | PIO A1/Printer strobe | 15 | 1 |
| 14 | PIO B4/Printer data 4 | 2 | 6 |
| 15 | PIO B3/Printer data 3 | 4 | 5 |
| 16 | PIO B2/Printer data 2 | 6 | 4 |
| 17 | PIO B1/Printer data 1 | 8 | 3 |
| 18 | PIO B0/Printer data 0 | 10 | 2 |
| 21 | Ground | 16 | 14 |
3. Software
NAS-DOS users who have returned their registration form will
have received a Utilities Disc containing some utility routines
to simplify use of printers of any of these types from BASIC,
the monitor NASPEN and ZEAP.
3.1 Serial printers without handshake
When using printers which do not require the ‘handshake’
line the printer is simply enabled by the X0 command in NAS-SYS,
or by the appropriate POKE’S in BASIC.ie
| NAS-SYS 1 | NAS-SYS 3 |
|---|
| 1 DOKE 3189,1925 | 1 DOKE 3189,1919 |
| 2 DOKE 3187,1917 | 2 DOKE 3187,1911 |
| 3 DOKE 3112,0 | 3 DOKE 3112,0 |
(See the NAS-SYS and BASIC manuals for further details)
The routine may be disabled using the NAS-SYS N command, a
reset or by a DOKE 3187,1919 (1913 in NAS-SYS 3) from BASIC.
ZEAP and NAS-PEN both assume printers of this type for
printed output. Instructions for use of a printer with Nascom
Pascal are included in the manual
3.2 Serial printers with handshake