80-Bus News |
May–June 1984 · Volume 3 · Issue 3 |
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available as CTRL/W, and LF is available as CTRL/J. Whether [ \ ] and { | } are shifted or unshifted depends on the Keyboard option. With these changes, the full ASCII character set is still available from the keyboard.
Upon power-up or reset, the PIO is initialized. Printer output is activated by the U command, and deactivated by the N command. This is made possible by a change in the workspace initialisation, $UOUT will initially point to the printer driver routine. Initial contents of $UOUT: C3 CB 04
Two new NAS-SYS commands are provided:
The contents of the accumulator are sent to the printer, using the printer driver routine. Please note that this command is independent of the N and U commands, working always. If the accumulator contains code £0A, data will not be sent to printer, code £0D will be sent to the printer as £0A. The printer must be on line, or the routine will make the Nascom hang up. This command is best used as a subroutine call in programs:
£DF £4C PRINT Sends contents of A to printer.
F aa bb cc dd .... Send Arguments To Printer
Up to ten hexadecimal arguments following the command are converted to 8-bit data and sent to the printer. If arguments >£FF are specified, only the least significant byte is sent. Please note that this command is independent of the N and U commands, working always. The printer must be on line, or the command will make the Nascom hang up. As this command uses the printer driver routine, arguments of £0A will be ignored, and arguments of £0D will be converted to £0A. This command is very useful for sending control codes to the printer, for example to activate or deactivate emphasized or enlarged print mode.
Printer on – U command
Printer off – N command
The user is in direct communication with the printer, that is, everything that is typed on the keyboard will be sent to the printer. Line feeds are ignored. Carriage returns will be sent as line feeds.
For the P command to function, the printer reflection must be changed:
101D DF 4C C9 SCAL "L RET
DEBUG uses the NAS-SYS $UOUT jump, and therefore turns off the printer when started. Use these DEBUG commands to control the printer:
Printer on – :C 04CB
Printer off – :C C143
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