; MXO-R+10.ASM -- Tandy TRS-80 Mod 4 under Digital Research's CP/M Plus. ; Overlay file for MEX -- 06/11/84 ; ; This file is based on the M7R4-1 overlay for the Montezuma Micro ; CP/M 2.2. It is heavily based on the Tandy Radio Shack Model I with ; Omicron CP/M 'Mapper' originally by Phil Becker and is credited as ; such. ; ; You will want to look this file over carefully. There are a number of ; options that you can use to configure the program to suit your taste. ; This file adapts the Tandy Model 4 computer to the modem program. ; Much of the information contained here is not in the main file. ; ; Edit this file for your preferences then follow the "TO USE:" example ; shown below. ; ; Use the "SET" command to change the baud rate. The program ; starts out at 300 baud when the program is first called up. ; ; TO USE: First edit this file filling in answers for your own ; equipment. Assemble with ASM, MAC or equivalent ; assembler. Then use MLOAD to overlay the results ; of this program to the original .COM file: ; ; A>MLOAD MEX.COM=MEX10.COM,MXO-R+10.HEX ; A> ; ; ; = = = = = = = = = = = = = = = = = = ; ; 06/11/84 - Modified for MEX10 - Len Moskowitz ; 02/02/84 - Modified to MDM724 with CP/M+ - Richard Press, M.D. ; 11/26/83 - Modified for the TRS80 Mod 4 - Steven J. Davidson, M.D. ; & Richard Press, M.D. ; 08/27/83 - Renamed to work with MDM712 - Irv Hoff ; 07/25/83 - Adapted for TRS-80 (zero ORG CP/M) - Phil Becker ; 06/22/83 - Revised to work with MDM710 - Irv Hoff ; 05/25/83 - Updated to work with MDM709 - Irv Hoff ; 05/15/83 - Revised to work with MDM708 - Irv Hoff ; 04/11/83 - Updated to work with MDM707 - Irv Hoff ; 04/04/83 - First version of this file - Irv Hoff ; ; = = = = = = = = = = = = = = = = = ; BELL: EQU 07H ;bell CR: EQU 0DH ;carriage return ESC: EQU 1BH ;escape LF: EQU 0AH ;linefeed ; YES: EQU 0FFH NO: EQU 0 ; ; PORT: EQU 0EAH ;TRS80 Mod 4 Modem Status Port MODCT1: EQU PORT ;Modem status port MODCT2: EQU PORT ;Modem control port MODDAT: EQU PORT+1 ;Modem data port MDDCDB: EQU 20H ;carrier detect bit MDDCDA: EQU 20H ;value when active BAUDRP: EQU PORT-1 ;Baud rate port MDRCVB: EQU 80H ;Recv. Ready Mask bit MDRCVR: EQU 80H ; -value when ready MDSNDB: EQU 40H ;xmit. ready mask bit MDSNDR: EQU 40H ; -value when ready ; ; MEX service processor stuff. Use instead of BDOS calls. More detail ; in PM overlay. ; MEX EQU 0D00H ;address of the service processor INMDM EQU 255 ;get char from port to A, CY=no more in 100 ms TIMER EQU 254 ;delay 100ms * reg B TMDINP EQU 253 ;B=# secs to wait for char, cy=no char CHEKCC EQU 252 ;check for ^C from KBD, Z=present SNNDRDY EQU 251 ;test for modem-send ready RCVRDY EQU 250 ;test for modem-receive ready SNDCHR EQU 249 ;send a character to the modem (after sndrdy) RCVCHR EQU 248 ;recv a char from modem (after rcvrdy) LOOKUP EQU 247 ;table search: see CMDTBL comments for info PARSFN EQU 246 ;parse filename from input stream BDPARS EQU 245 ;parse baud-rate from input stream SBLANK EQU 244 ;scan input stream to next non-blank EVALA EQU 243 ;evaluate numeric from input stream LKAHED EQU 242 ;get nxt char w/o removing from input GNC EQU 241 ;get char from input, cy=1 if none ILP EQU 240 ;inline print DECOUT EQU 239 ;decimal output PRBAUD EQU 238 ;print baud rate ; PRINT EQU 9 ;BDOS print-string function ; ; ORG 100H ; ; DS 3 ;(for "JMP START" instruction) PMODEM: DB NO ;not used by MEX 103H SMODEM: DB NO ;not used by MEX 104H TPULSE: DB 'T' ;T=tone, P=Pulse(Smartmodem-only) 105H CLOCK: DB 40 ;clock speed in MHz x10, 25.5 MHz max. 106H ;20=2 MHh, 37=3.8 MHz, 40=4 MHz, etc. MSPEED: DB 1 ;0=110 1=300 2=450 3=600 4=710 5=1200 107H ;6=2400 7=4800 8=9600 9=19200 default BYTDLY: DB 5 ;0=0 delay 1=10ms 5=50 ms - 9=90 ms 108H ;default time to send character in ter- ;minal mode file transfer for slow BBS. CRDLY: DB 3 ;0=0 delay 1=100 ms 5=500 ms - 9=900 ms 109H ;default time for extra wait after CRLF ;in terminal mode file transfer COLUMS: DB 5 ;number of DIR columns shown 10AH SETFL: DB YES ;yes=user-added Setup routine 10BH SCRTST: DB YES ;cursor control routine 10CH DB YES ;spare BAKFLG: DB NO ;yes=change any file same name to .BAK 10EH CRCDFL: DB YES ;yes=default to CRC checking 10FH ;no=default to Checksum checking TOGCRC: DB YES ;yes=allow toggling of CRC to Checksum 110H CVTBS: DB NO ;yes=convert backspace to rub 111H TOGLBK: DB YES ;yes=allow toggling of bksp to rub 112H ADDLF: DB YES ;no=no LF after CR to send file in 113H ;terminal mode (added by remote echo) TOGLF: DB YES ;yes=allow toggling of LF after CR 114H TRNLOG: DB YES ;yes=allow transmission of logon 115H ;write logon sequence at location LOGON SAVCCP: DB YES ;yes=do not overwrite CCP 116H LOCNXT: DB YES ;yes=local command if EXTCHR precedes 117H ;no=external command if EXTCHR precedes TOGLOC: DB YES ;yes=allow toggling of LOCONEXTCHR 118H LSTTST: DB YES ;yes=printer available on printer port 19H XOFTST: DB YES ;yes=chcks for XOFF from remote while 11AH ;sending a file in terminal mode XONWT: DB NO ;yes=wait for XON after CR while 11BH ;sending a file in terminal mode TOGXOF: DB YES ;yes=allow toggling of XOFF checking 11CH IGNCTL: DB YES ;yes=CTL-chars above ^M not displayed 11DH EXTRA1: DB 0 ;for future expansion 11EH EXTRA2: DB 0 ;for future expansion 11FH BRKCHR: DB 'B'-40H ;Send a 300 ms. break tone 120H NOCONN: DB 'N'-40H ;^N = Disconnect from phone line 121H LOGCHR: DB 'L'-40H ;^L = Send logon 122H LSTCHR: DB 'P'-40H ;^P = Toggle printer 123H UNSVCH: DB 'T'-40H ;^R = Close input text buffer 124H TRNCHR: DB 'Y'-40H ;^T = Transmit file to remote 125H SAVCHR: DB 'R'-40H ;^Y = Open input text buffer 126H EXTCHR: DB 'K'-40H ;^K = Send next character 127H ; PRATE: DS 2 ;PMMI equates (see PMMI overlay) 128H ; INCTL1: IN MODCT1 ;in modem control port 12AH PUSH B ANI 0DFH MOV B,A ;save status JMP CTLPT2 ;continue DS 1 ; OTDATA: OUT MODDAT ! RET ;out modem data port 134H ; ; ; CONTINUE STATUS READ ; CTLPT2: IN 0E8H ;read CD port ANI 20H ;isolate CD ORA B ;merge status POP B RET ; INPORT: IN MODDAT ! RET ;in modem data port 13EH DS 7 MASKR: ANI MDRCVB ! RET ;bit to test for receive ready 148H TESTR: CPI MDRCVR ! RET ;value of rcv. bit when ready 14BH MASKS: ANI MDSNDB ! RET ;bit to test for send ready 14EH TESTS: CPI MDSNDR ! RET ;value of send bit when ready 151H DS 12 ;not used by MEX 156H ; LOGON: DS 2 ;not used by MEX 160H DIALV: DS 3 ;dials digit (not implemented) 162H DISCV: DS 3 ;disconnects modem (not impl.) 165H GOODBV: JMP GOODBYE ;called before exit to CP/M 168H INMODV: JMP INITMOD ;Called at cold start 16BH NEWBDV: DS 3 ;not implemented 16EH NOPARV: DS 3 ;not implemented 171H PARITV: DS 3 ;not implemented 174H SETUPV: JMP SETUPR ;SET command 177H SPMENV: DS 3 ;not used with MEX 17AH VERSNV: JMP SYSVER ;overlay's voice in sign-on 17DH BREAKV: JMP SENDBRK ;send a break 180H ; ; ; These six lines are an artifact of MDMXXX. They are not used with MEX ; ILPRTV: DS 3 ;replace with MEX function 9 183H INBUFV: DS 3 ;replace with MEX function 10 186H ILCMPV: DS 3 ;replace with table lookup funct. 247 189H INMDMV: DS 3 ;replace with MEX function 255 18CH NXSCRV: DS 3 ;not supported by MEX 18FH TIMERV: DS 3 ;replace with MEX function 254 192H ; ; Clear sequences -- CLREOS is clear to end of screen, CLRSCRN is clear ; entire screen. Last entry must be 0. Any other 0's act as NOP's. ; CLREOS: MVI C,ILP ; 195H CALL MEX ; 197H DB 01BH,04AH,0 ; 19AH RET ; 19DH ; CLRSCRN: MVI C,ILP ; 19EH CALL MEX ; 1A0H DB 01BH,045H,0 ; 1A3H RET ; 1A6H ; ; ; End of the fixed format area ; ; SYSVER: MVI C,ILP ; CALL MEX ; DB '*** Version for Tandy TRS80 Mod 4 ***' DB CR,LF DB '*** with Tandy/DRI CP/M Plus ***' DB CR,LF,0 RET ;..... ; ; ;----------------------------------------------------------------------- ; ; NOTE: You can change the SYSVER message to be longer or shorter. The ; end of your last routine should terminate by 0400H (601 bytes ; available after start of SYSVER) if using the Hayes Smartmodem ; or by address 0C00H (2659 bytes) otherwise. ; ;----------------------------------------------------------------------- ; ; This routine allows a 300 ms. break tone to be sent to reset some ; time-share computers. ; SENDBRK: MVI A,0E8H ; 8 bit words, 1 stop bit, no parity, JMP GOODBYE1 ; DTR & RTS disabled, *BREAK bit SET* ; ;..... ; ; The Goodbye routine is the last routine run before exiting to CP/M. ; If you share the serial port between the modem and some other device, ; you can use Goodbye to change the characteristics of the port. ; This routine sends a 300 ms. break tone and sets DTR low for the same ; length of time to disconnect some modems such as the Bell 212A, etc. ; GOODBYE: ; MVI A,0EBH ;send break, turn off DTR ; GOODBYE1: ; OUT MODCT1 ;send to status port MVI B,3 ;delay about 300 ms. MVI C,TIMER CALL MEX MVI A,0ECH ;normal send/receive with DTR OUT MODCT1 ;send to status port RET ; ; ; TRS80 Mod 4 initialization -- sets CTC timer 0 for baudrate in/out. ; ; TRS80 Mod 4 specific equates for initialization. ; CTCCMD: EQU 0E8H ;Master Reset, UART cntrl. register CTC0: EQU 0E9H ;BR19411 Timer control Timer 0 (port A) IB300 EQU 55H ;Default 300 baud ; INITMOD: MVI A,1 ;Reset UART and enable it OUT CTCCMD ; MVI A,0ECH ;8 bits, no parity, 1 stop bit, enable DTR OUT MODCT1 ; and RTS ; LSBD: MVI A,IB300 OUT CTC0 ; INITMOD1: MVI A,1 ;default transfer time to 300 baud STA MSPEED RET ; ;..... ; ; SETUPR: MVI C,SBLANK ;any parameters? CALL MEX JC TELL ;if not, go display current baud rate LXI D,CMDTBL ;use MEX LOOKUP function to get a jump MVI C,LOOKUP ; vector if the parameter is valid CALL MEX ;parse parameter to SET PUSH H ;MEX LOOKUP returns with the address of the ; baud rate change routine in HL. Save it ; on the stack. RNC ;return to the baud rate change routine POP H ;oops, the parameter to SET was not in our ; table. MVI C,ILP ; CALL MEX ;tell the user that the baud rate he asked ; for is illegal DB CR,LF,'Only 300, 600, 1200, 4800, 9600, and 19200 allowed in' DB 'SET command',CR,LF,0 RET ; ; SET command table - this table is used by the MEX LOOKUP routine. Note ; that the first part of each entry is the string we match against. ; Its last character must have its MSBit set. The second part of ; the entry is the value we want returned in HL. This is a painless ; way to do a string comparison and branch function. CMDTBL: DB '30','0'+80H DW OK300 DB '60','0'+80H DW OK600 DB '120','0'+80H DW OK1200 DB '480','0'+80H DW OK4800 DB '960','0'+80H DW OK9600 DB '1920','0'+80H DW OK19200 ; ; TELL: MVI C,ILP CALL MEX ;print current baud rate DB CR,LF,'Baud rate is now: ',0 LDA MSPEED MVI C,PRBAUD CALL MEX RET ; ; ; OK300: MVI A,1 ;MSPEED 300 baud value LHLD BD300 ;get 300 baud parameters in 'HL' JMP LOADBD ;go load them ; OK600: MVI A,3 LHLD BD600 JMP LOADBD ; OK1200: MVI A,5 LHLD BD1200 JMP LOADBD ; OK4800: MVI A,7 LHLD BD4800 JMP LOADBD ; OK9600: MVI A,8 LHLD BD9600 JMP LOADBD ; OK19200: MVI A,9 LHLD BD19200 ;fall thru..... ; LOADBD: STA INITMOD1+1 ;change time-to-send to match baudrate MOV A,L ;get baudrate byte STA LSBD+1 ;store in INITMOD JMP LSBD ;reinitialize to new baudrate, then done RET ; ; ; TABLE OF BAUDRATE PARAMETERS ; BD300: DB 55H ; 300 baud BD600: DB 66H ; 600 baud BD1200: DB 77H ; 1200 baud BD4800: DB 0CCH ; 4800 baud BD9600: DB 0EEH ; 9600 baud BD19200: ; DB 0FFH ;19200 baud ; ; ; (END OF INITMOD AND SETUP ROUTINES) ;======================================================================= ; ; Your overlays may use memory up to 0CFFH, unless you are ; using the MEX Smartmodem overlay (MXO-SMxx.ASM). Then ; you have only up to 0AFFH. ; ;======================================================================= ; END