; B5C8-1E.INS - BYE5 insert for Commodore C128, external modem - 7/21/86 ; ; Modifications by David Giunti, July 20, 1986 ; change MDCARCK to correct the actual PORT check ; Note all the I/O in the C=128 is located in Bank 0, and can ; be read and written useing the Z80's IN and OUT with 16bit ; pointers. ; ; Added a CMA in the MDOUTST ; ; I'm still not sure if MHZ should be 1 rather than 2, as this ; .INS could not have worked without MDCARCK ; July 21. This .INS will work correctly with MHZ set to 2. If ; you have an 80col monitor use Von Ertwine's CONFIG to set 40COL=OFF ; as this gives a 10%+ system speed-up. Get a copy of CCP+.LBR and use it. ; July 26. The TSTBAUD: routine requires that the Zero flag be set to ; know that the baudrate was correctly set, and MDIN2: returns it set ; so rather than just comment out the code in the main BYE509 I'll add ; some ugly code to set the Zero Flag manually. ; ; .INS is now very ready for final test ; Dave Giunti ;======================Original Header============12/12/85=========== ; IMPORTANT: When going through the options for ; BYE5, be sure to set: ; ; MHZ EQU 1 ; ; regardless what you think it should ; be set for. The modem routines built ; into the Commodore IOS use "bit-bang- ; ing" interrupt control and this value ; should be used. (All this does is ; control the number of loops used for ; timing purposes.) ; ; = = = = = = = = = = = = = = = = = = ; ; 12/12/85 Written to work with BYE5 - Irv Hoff ; 07/21/86 modified version for BYE509 from work done by ; Irv Hoff and George Peace - David Giunti ; = = = = = = = = = = = = = = = = = = ; ; C128 data ; PORT EQU 6 MEMRY EQU 0FD4EH MDCTL1 EQU MEMRY+1 SNDDAT EQU MEMRY+2 RCVDAT EQU MEMRY+3 MDDCD EQU 10H ; Bit 4 to test for DCD MDRCV EQU 01H ; Bit 0 to test for receive ready MDSND EQU 80H ; Bit 7 to test for send ; CBNK EQU 0FD1DH ; Address of the current bank byte ; ; ; Table of baudrate parameters ; BD300 EQU 6 ; Divisor for 300 baud BD1200 EQU 8 ; Divisor for 1200 bps (The Commodore ; C128 does not support faster speeds ; in the CP/M-128 mode) ; ;----------------------------------------------------------------------- ; ; See if we still have a carrier - if not, return with the zero flag set ; MDCARCK: ; LDA 0DD01H ; Get status ; this should be an IN like in MDINIT below to work correctly -dag PUSH B ; save reg LXI B,0DD01H ; point at data port B DB 0EDH,78H ; Input to A, pointed by BC CMA ; Invert the value for active low ANI MDDCD ; Check DCD for carrier from modem POP B ; restore B reg RET ;..... ; ; ; Disconnect and wait for an incoming call. ; MDINIT: LXI B,0DD01H ; Dataport B DB 0EDH,78H ; Input A (Z80 instruction) ANI 0F9H DB 0EDH,79H ; Output the new value, to disconnect MVI B,20 ; 2 seconds to drop DTR MDIN1: CALL DELAY ; 0.1 second delay DCR B JNZ MDIN1 ; Keep waiting until carrier drops LXI B,0DD01H ; Reset back to normal DB 0EDH,78H ORI 6 DB 0EDH,79H MVI A,1 ; Set to 8 bits, no parity STA MEMRY ; Configure byte in BIOS MVI B,BD300 ; Initialize to 300 baud ;..... ; ; ; Initialize the port, baudrate is now in the B-reg. find where it goes ; and put it there. ; MDIN2: PUSH B ; Temporarily store the baudrate value LHLD 0000H+1 ; Get BIOS address LXI D,57 ; CP/M JMP device table DAD D ; Index into BIOS CALL MDIN3 ; Jumps to address now in HL ; returns with HL=char device tbl start LXI D,PORT*8+7 ; Offset to RS232 baud rate DAD D ; Point to RS232 baud rate byte ; Byte now in HL POP B ; Get the baudrate value back MOV M,B ; Store the requested baud rate ; ; ; Have now stored desired baudrate, find the address in BIOS where the ; port will be initialized, put the correct port into the 'C' register ; and then initialize that port to baud rate just set, finished. ; LHLD 0000H+1 ; Get BIOS address LXI D,60 ; CP/M init address DAD D ; Index into BIOS MVI C,PORT ; Tell it what port to initialize CALL MDIN3 ; xra a ; clears all bits in Acum, sets Zero flag -dag ; ; ; Jumps to HL address, performs that routine, then returns here ; IF IMODEM CALL IMINIT ; Initialize smartmodem ENDIF ; IMODEM ; RET ;... ; ; MDIN3: PCHL ; Jump to that routine then return ;..... ; ; ; Input a character from the modem port ; MDINP: LDA RCVDAT ; Get character ; ; ; We found there was a character, got it, but have to manually reset the ; flag to zero saying we did get the character. ; PUSH H ; Save the current address just in case LXI H,MDCTL1 ; Address of status byte DB 0CBH,86H ; Reset the 0 bit of the HL status byte POP H ; Restore the original address RET ; Return with the character ;..... ; ; ; Check the status to see if a character is available. if not, return ; with the zero flag set. If yes, use 0FFH to clear the flag. ; ; note that CMA is not required here because of the logical construction MDINST: LDA MDCTL1 ; Get status ANI MDRCV RZ ; No character, return ;... ; ; MDINST1:ORI 0FFH ; We have a character, clear the flag RET ;..... ; ; ; Send a character to the modem ; MDOUTP: STA SNDDAT ; Output the character ; ; ; Output character has been stored in the BIOS memory location, now set ; the flag showing there is a charcter ready. ; PUSH H ; Save any current address, if needed LXI H,MDCTL1 ; Address of the status byte DB 0CBH,0FEH ; Set bit 7 of the HL status byte POP H ; Get the original address back RET ; All done ;..... ; ; ; See if the output is ready for another character ; MDOUTST:LDA MDCTL1 ; Get the status bit cma ; invert bits for check -dag ANI MDSND ; Check send ready bit RET ; If pin is high, not ready ;..... ; ; ; Renitialize the modem and hang up the phone by dropping DTR and ; leaving it inactive. ; MDQUIT: IF IMODEM CALL IMQUIT ENDIF ; IMODEM ; ; ; Called by the main program after caller types BYE ; MDSTOP: MVI B,BD300 ; Initialize to 300 baud CALL MDIN2 ; Set to 300 baud to speed up C128 LXI B,0DD01H ; Dataport B DB 0EDH,78H ; Input A (Z80 instruction) ANI 0F9H ; Keep DTR set low permanently DB 0EDH,79H ; Output the new value, to disconnect RET ;..... ; ; ; The following routine sets the baudrte. BYE5 asks for the maximum ; speed you have available. ; SET2400 EQU 0 ; SETINV: MVI A,0FFH ORA A ; Make sure the Zero flag isn't set RET ;..... ; ; SET300: MVI B,BD300 ; Get 300 baud parameters in 'HL' JMP MDIN2 ; SET1200:MVI B,BD1200 JMP MDIN2 ;..... ; ; ;----------------------------------------------------------------------- ; CP/M v3.0 routines ; ; Perform system or hardware dependent PRE-processing. The following ; code will be executed by the PATCH subroutine before the BIOS jump ; table is overwritten. ; MDPREP: RET ;..... ; ; ; Perform system or hardware dependent POST-processing. ; The following code will be executed by the EXCPM routine before re- ; turning control to CP/M Plus when the BYE5 program is terminated. ; MDPOSP: RET ;..... ; ; end ;----------------------------------------------------------------------- minated. ; MDPOSP: RET ;..... ; ; end ;--------------------------------------