;////////////////////////////////////////////////////////////////////////////// ; Title 'MEX Overlay for Advanced Digital Super Six / Super Quad SBC' ; ;////////////////////////////////////////////////////////////////////////////// ; REV EQU 13 ; revision number * 10 ; ;---------------- ; History: ; ; ; 11/24/84 ... MXO-AD13.ASM (was MXO-AD12.ASM) ; ; Squashed a bug with the default baud rate setting if a ; new rate was set then a CLONE was done - would not come ; up at the new bit rate. Added SET DIGIT implemented as ; inter-digit time specification (40 mS works well). ; JP Sojak ; ;----------------- ; ; MEX Overlay for Advanced Digital Computers using the on board RS232 EIA ; port. The SBC utilizes a Z80 DART and a dual baud rate generator with ; one oddball... the initial baudrate for the console and the serial port ; is set with 7 Berg jumpers upon reset through a read only IO port. The 8th ; bit is the side select bit for the floppy controller. The dual baud rate ; generator needs 8 bits to be set, 4 bits for each channel. This overlay ; therefore brings in the jumpers, masks the side bit, extracts the default ; console baud rate, 's in the modem baud rate and writes it out to the ; generator. Type ahead buffer may be installed with this overlay ... the ; interrupt vector is not modified. In addition, A full-featured SET command ; processor is implemented to select the serial communications character- ; istics of serial port 02, the modem port. A SET shows the current ; default settings, a SET ? brings up help and a SET XXXXXXX where XXXXXXX ; is defined in the following table will SET a new parameter. ; ; Available SET Commands: ; ; DELAY (seconds) BAUD 110-19.2K ; ORIG (originate mode) ANSWER (mode) ; TONE (dialing) PULSE (dialing) ; MONITOR (speaker on) QUIET (speaker off) ; PARITY (Odd, Even, None) STOPBITS (1, 1.5, 2) ; LENGTH (5, 6, 7, or 8) DIGIT