1 ' see PC Magazine Volume 1 Number 3 june/july 1982
10 REM program serial. used to fakeout PC to allow use of serial printer in the same way the Print Screen function works for a parallel
20 '
30 ' It seems that in order for this program to run you must have the serial cable connected to a printer or modem that is TURNED ON. Otherwise the open COMLINE$ in line 220 wont open.
40 '
50 ' Baud rates in line 220 can ONLY be 75, 110, 150, 300, 600, 1200, 1800, 2400 4800, or 9600
60 '
70 ' After running this program, you must exit to the system (DONT BOOT), then re-enter BASIC for basic to recognize the new parameters.
80 '
90 'LLIST and LPRINT will work ; and when you use the SYSTEM command to return to DOS, Control PrtSc & up-shift PrtSc are enabled in PC-DOS rev 1.0 you could AUTOEXEC.BAT this routine ie.. 1) DATE 2)BASIC SERIAL 3)BASIC
100 '
110 CLS:COLOR 0,7:PRINT TAB(32);"PROGRAM SERIAL";TAB(79):COLOR 7,0:LOCATE 3,1: PRINT "Make sure your serial printer is connected to the Async RS-232 port": PRINT "and the printer in turned on and `ON-LINE' ie. not in `local' mode"
115 REM
120 LOCATE 8,1:PRINT "Please enter the baud rate at which":PRINT "you wish to send data to the serial printer";TAB(79):PRINT SPC(79):PRINT "(baud rate can only be : 75,110,150,300,600,1200,1800,2400,4800,9600)";TAB(79);
280 POKE &H8, &HF8 'tell basic that there is a printer
290 POKE &H9, &H3
300 DEF SEG=&H0 : POKE &H100, &HFB 'restore the flages
310 REM an inconsistency exists in the rom bios concerning the meaning of the AH register in the RS232 and the Parallel port subroutines therefore the following line
320 POKE &H101, &HB4 : POKE &H102, &H1
330 REM the next three lines simulate the printer port interrupt vector
340 POKE &H103, &HEA : POKE &H104, &H39
350 POKE &H105, &HE7 : POKE &H106, &H0
360 POKE &H107, &HF0
370 REM now tell the interrupt handler to jump to 100H for its new instruction sequence
380 POKE &H5C, &H0 : POKE &H5D, &H1
390 POKE &H5E, &H0 : POKE &H5F, &H0
400 CLS:BEEP:LOCATE 4,10:PRINT "The new parameters for serial printer operation at";BAUD!;"baud":LOCATE,10:PRINT"have been set;": LOCATE 7,10:PRINT "Re-enter basic and use up-shift PrtSc in BASIC.":LOCATE 9,40:PRINT "up-shift or"
410 LOCATE ,40:PRINT"Control PrtSc in PC-DOS":LOCATE ,61:PRINT "as required";:LOCATE 15,1
420 SYSTEM
4800 , OR 9600
r"
410 LOCATE ,40:PRINT"Control PrtSc in PC-DOS":LOCATE ,61:PRINT "as required";:LOCATE 15,1