80-Bus News


July–August 1983, Volume 2, Issue 4

Page 23 of 55




Dis-assembly of NASCOM ROM BASIC Ver 4.7                PAGE    1

                ; GENERAL EQUATES

0001            UARTD   EQU     01H             ; UART data port
0002            UARTS   EQU     02H             ; UART status port
0003            CTRLC   EQU     03H             ; Control "C"
0007            CTRLG   EQU     07H             ; Control "G"
0008            BKSP    EQU     08H             ; Back space
000A            LF      EQU     0AH             ; Line feed
000C            CS      EQU     0CH             ; Clear screen
000D            CR      EQU     0DH             ; Carriage return
000F            CTRLO   EQU     0FH             ; Control "O"
0012            CTRLR   EQU     12H             ; Control "R"
0013            CTRLS   EQU     13H             ; Control "S"
0015            CTRLU   EQU     15H             ; Control "U"
001A            CTRLZ   EQU     1AH             ; Control "Z"
001B            ESC     EQU     1BH             ; Escape
001C            TBRK    EQU     1CH             ; "T" monitor break
001D            TBS     EQU     1DH             ; "T" monitor back space
001E            TCS     EQU     1EH             ; "T" monitor clear screen
001F            TCR     EQU     1FH             ; "T" monitor carriage return
007F            DEL     EQU     7FH             ; Delete

                ; MONITOR LOCATIONS

0000            MONSTT  EQU     0000H           ; Start of monitor
000D            STMON   EQU     000DH           ; NAS-SYS initialisation
0051            MFLP    EQU     0051H           ; Flip tape LED ("T")
008D            MONTYP  EQU     008DH           ; Type of "T" monitor
03D1            T2DUMP  EQU     03D1H           ; "T2" Dump routine
0400            T4WR    EQU     0400H           ; "T4" Write routine
070C            T4READ  EQU     070CH           ; "T4" Read routine
0800            VDU     EQU     0800H           ; NASCOM Video RAM base


0C00            PORT0   EQU     0C00H           ; Copy of output port 0
0C0C            ARG1    EQU     0C0CH           ; Argument 1
0C0E            ARG2    EQU     0C0EH           ; Argument 2
0C18            TCUR    EQU     0C18H           ; "T" monitor cursor
0C29            CURSOR  EQU     0C29H           ; NAS-SYS Cursor
0C2B            ARGN    EQU     0C2BH           ; Number of ARGS
0C4A            TOUT    EQU     0C4AH           ; "T" Output reflection
0C4D            TIN     EQU     0C4DH           ; "T" Input reflection
0C75            CIN     EQU     0C75H           ; NAS-SYS Input table
0C7E            NMI     EQU     0C7EH           ; NAS-SYS NMI Jum

This is an OCR’d version of the scanned page and likely contains recognition errors.

NASCOM ROM BASIC source code is available in ASM and LST file format.

Page 23 of 55