title 'MXO-C128.ASM -- Commodore 128 overlay for MEX 19 Nov 85'
$*MACRO ; only show code produced by MAC not MACRO expansion
;
; You will want to look this file over carefully. There are a number of
; options that you can use to configure the program to suit your taste.
;
; Edit this file for your preferences then follow the "TO USE:" example
; shown below.
;
; Use the "SET" command to change the baudrate when desired. It starts
; out at 1200 baud when the program is first called up.
;
; = = = = = = = = = = = = = = = = = =
; 11/13/85 - MEXified overlay - Von Ertwine
; = = = = = = = = = = = = = = = = = =
;
;
eom equ 00h ; end of message
bell equ 07h ; bell
lf equ 0Ah ; linefeed
cr equ 0Dh ; carriage return
esc equ 1Bh ; escape
no equ 0
yes equ not(no)
page
;
; C128 info
;
dev$no: equ 6
XxD$config: equ 0fd4Eh
; bit 7 0=no parity 1=parity
; bit 6 0=mark/space 1=odd/even
; bit 5 0=space/even 1=mark/odd
; bit 1 0=1 stop bit 1=2 stop bits
; bit 0 0=7 data bits 1=8 data bits
RS232$status: equ XxD$config+1
; bit 7 1=send data, 0=no data
; bit 6 1=sending data now
; bit 5 1=recv que active
; bit 4 1=parity error
; bit 3 1=framing error
; bit 2 not used
; bit 1 receiving data now
; bit 0 data byte ready
xmit$data: equ RS232$status+1
recv$data: equ xmit$data+1
MODRCVB: equ 01H ; bit to test for receive
MODRCVR: equ 01H ; value when receive ready
MODSNDB: equ 80H ; bit to test for send
MODSNDR: equ 00H ; value when send ready
data$port$a equ 0DD00h
; bit 2 TxD Data (output)
data$port$b equ data$port$a+1
data$port$b$dir equ data$port$b+2
; bit 7 Data Set Ready (input)
; bit 6 Clear to Send (input)
; bit 5 Place Phone On Hook (active low output)
; bit 4 Carrier Detect (active low input)
; bit 3 Ring Indicator (active low input)
; bit 2 Data Terminal Ready (active hi output)
; bit 1 Request to Send (active hi output)
; bit 0 Received Data (input)
page
;
; MEX service processor stuff
;
MEX EQU 0D00h ;address of the service processor
ESCCHR EQU 0D1Fh ;Terminal Mode escape char (1Bh=ESC)
XSIZE EQU 0D23h ;transfer buffer size
QUEUE EQU 0D51h ;enable/disable queueing (1/0)
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
SNDRDY 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 ;MEX/BDOS print-string function call
page
;
bit macro ?N,?R
db 0cbh,?N*8+?R+040h
endm
setb macro ?N,?R
db 0cbh,?N*8+?R+0C0h
endm
res macro ?N,?R
db 0cbh,?N*8+?R+80h
endm
@chk macro ?DD
if (?DD GT 7Fh) and (?DD LT 0FF80h)
'Displacement Error'
endif
endm
jr macro ?N
db 18h,?N-$-1
@chk ?N-$
endm
jrz macro ?N
db 28h,?N-$-1
@chk ?N-$
endm
jrnz macro ?N
db 20h,?N-$-1
@chk ?N-$
endm
jrc macro ?N
db 38h,?N-$-1
@chk ?N-$
endm
jrnc macro ?N
db 30h,?N-$-1
@chk ?N-$
endm
inp macro ?R
db 0EDh,?R*8+40h
endm
outp macro ?R
db 0EDh,?R*8+41h
endm
page
org 100h
;
;
; Change the clock speed to suit your system
;
DS 3 ;(for "JMP START" instruction)
;
local$config: db 01h ; default to 8 bit no parity 1 stop 103H
mdm$tp: db 8Ah ; bit (default 1670 with 1200 or 300) 104H
; 7 (1670 if set)
; 6 (1650 or 1660 if set)
; 5 (1660 if set)
; 4 (supports CD if clear {1650,1660})
; 3 (set if 1200 baud is supported)
; 2 (set if 600 baud is supported)
; 1 (set if 300 baud is supported)
; 0 (set if 110 baud is supported)
TPULSE: DB 'T' ;T=touch, P=pulse (Smartmodem-only) 105H
CLOCK: DB 13 ;clock speed in MHz x10, 25.5 MHz max. 106H
;20=2 MHh, 37=3.68 MHz, 40=4 MHz, etc.
MSPEED: DB 5 ;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 5 ;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
SETFLG: DB YES ;yes=user-added Setup routine 10BH
SCRTST: DB YES ;Cursor control routine 10CH
DB YES ;yes=resend a record after any non-ACK 10DH
;no=resend a record after a valid NAK
BAKFLG: DB NO ;yes=change any file same name to .BAK 10EH
CRCDFL: DB YES ;yes=default to CRC checking 10FH
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
DB NO ;yes=allow transmission of logon 115H
;write logon sequence at location LOGON
SAVCCP: DB YES ;yes=do not overwrite CCP 116H
DB NO ;yes=local command if EXTCHR precedes 117H
;no=external command if EXTCHR precedes
DB YES ;yes=allow toggling of LOCONEXTCHR 118H
LSTTST: DB no ;yes=allow toggling of printer on/off 119H
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 no ;yes=CTL-chars above ^M not displayed 11DH
EXTRA1: DB 0 ;for future expansion 11EH
EXITCHR: DB 'E'-40H ;^E = Exit to main menu 11FH
BRKCHR: DB '@'-40H ;^@ = Send a 300 ms. break tone 120H
NOCONN: DB 'N'-40H ;^N = Disconnect from the phone line 121H
LOGCHR: DB 'L'-40H ;^L = Send logon 122H
LSTCHR: DB 'P'-40H ;^P = Toggle printer 123H
UNSAVE: DB 'R'-40H ;^R = Close input text buffer 124H
TRNCHR: DB 'T'-40H ;^T = Transmit file to remote 125H
SAVCHR: DB 'Y'-40H ;^Y = Open input text buffer 126H
EXTCHR: DB '^'-40H ;^^ = Send next character 127H
;
;
DS 2 ; 128H
INCTL1:
lda RS232$status ;get the status bits 12Ah
ret
show$baud: ; 12Eh
jmp disp$rate ;display current baud rate
ds 3
;
OTDATA: ;out modem data port 134H
sta xmit$data
push h
lxi h,RS232$status
jmp out$c128$cont
INPORT: ;in modem data port 13EH
lda recv$data
push h
lxi h,RS232$status
jmp in$c128$cont
MASKR: ani modrcvb ;bit to test for receive ready 148H
ret
TESTR: cpi modrcvr ;value of receive bit when rdy 14BH
ret
MASKS: ani modsndb ;bit to test for send ready 14EH
ret
TESTS: cpi modsndr ;value of send bit when ready 151H
ret
ds 6 ; 154H
OUTMODCT1:
ret ! nop ! nop ;out modem control port 15AH
OUTMODCT2:
ret ! nop ! nop ;out modem status port 15DH
;
;
DS 2 ;Not used by MEX 160H
DS 6 ; 162H
GOODBV: JMP GOODBY ; 168H
INMODV: JMP NITMOD ;go to user written routine 16BH
NEWBDV: JMP NEWBAUD ;Change baudrate 16EH
RET ! NOP ! NOP ;(by-passes PMMI routine) 171H
RET ! NOP ! NOP ;(by-passes PMMI routine) 174H
SETUPV: JMP SETCMD ; 177H
DS 3 ; 17AH
VERSNV: JMP SYSVER ; 17DH
BREAKV: JMP SBREAK ; 180H
;
;
; Do not change the following six lines.
;
ILPRTV: DS 3 ; 183H
INBUFV: DS 3 ; 186H
ILCMPV: DS 3 ; 189H
INMDMV: DS 3 ; 18CH
DS 3 ; 18FH
TIMERV: DS 3 ; 192H
;
; Clear sequences -- CLREOS is clear to end of screen, CLRSCRN is clear
; entire screen.
;
CLREOS:
mvi c,ILP
call mex
db esc,'Y',eom
RET
;
CLS:
mvi c,ILP
call mex
db 'Z'-40h,eom
ret
nop
;
;
SYSVER:
mvi c,ILP ; 1A7H
call mex
db 'Version for Commodore 128'
db cr,lf,eom
ret
;
;
out$c128$cont:
setb 7,m
pop h
ret
;
;
in$c128$cont:
res 0,m
pop h
ret
page
;
;
; This routine allows a 300 ms. break tone to be sent to reset some
; time-shar computers.
;
SBREAK:
lda rs232$status
ani 01000010b ; any RS232 activity now?
jrnz SBREAK ; yes, wait until done.
di ; prevent intterupts from
push b ; ..resetting break
lxi b,data$port$a
inp a
ani 0FBh ; send a break tone will be cleared
outp a ; ..when interrupts turned on
mvi b,8 ; time flies with-out intterrupts on
mvi c,TIMER
call mex
pop b
ei
ret
;
; 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.
;
GOODBY: ; TURN OFF DTR
push b
lxi b,data$port$b
inp a
ani not(6) ; clear DTR and CTS bits
outp a
call sbreak ; send 300ms break
inp a
ori 6 ; set DTR and CTS bits
outp a
pop b
mvi a,6 ; set back to 300 baud
jmp reset$baud ; ..so system does not run slow
; call/ret
page
;
; C128 initialization -- set baudrate.
;
NITMOD:
lda local$config ; set default to 8 bits no parity
sta XxD$config
lda mspeed
call new$baud ; set default BAUD rate
lxi b,data$port$b$dir
mvi a,6
outp a
mvi c,low(data$port$b)
inp a
ori 6 ; set DTR and CTS bits (active hi)
outp a
ret
page
;
; Setup routine to allow changing modem speed with the SET command.
;
SETCMD:
mvi c,SBLANK ; Any arguments?
call mex
jrc tell ; If not, go display baud
lxi d,cmdtbl
mvi c,LOOKUP
call mex ; Parse argument
cnc ipchl ; If we have one, go set it
;
tell:
push psw ; save carry flag
call disp$rate
pop psw ; recover carry flag
jrnc skip$tell$baud ; ..(prt following if Cy=1)
mvi c,ILP
call mex ; Print current baud rate
db cr,lf,'The following '
db 'Baud rate(s) are legal: ',eom
mvi b,1
call prt$rate
db '110 ',eom
mvi b,2
call prt$rate
db '300 ',eom
mvi b,4
call prt$rate
db '600 ',eom
mvi b,8
call prt$rate
db '1200 ',eom
skip$tell$baud:
mvi c,ILP
call mex
db cr,lf,eom
ret
;
;
;
disp$rate:
mvi c,ILP
call mex ; Print current baud rate
db cr,lf,'Baud rate is'
db ' now: ',eom
lda mspeed
mvi c,prbaud
call mex
lda XxD$config
lxi b,'7'*256+'1' ; B='7' C='1'
bit 0,a ; bit 0=1 if 8 bits
jrz dsp$7
inr b
dsp$7:
bit 1,a ; bit 1=1 if 2 stop bits
jrz dsp$1
inr c
dsp$1:
lxi h,byte$type$tbl+1-3
ani 11100000b ; only test the parity
tst$nxt:
inx h
inx h
inx h
cmp m
jrnz tst$nxt
dcx h ; byte before is the type
mov a,m
lxi h,msg$ptr
mov m,b ; save the word length
inx h
mov m,a ; save the parity
inx h
mov m,c ; save the stop bits
mvi c,ilp
call mex
db ' ('
msg$ptr:
db '8'
db 'N'
db '1)',cr,lf,eom
ret
;
;
;
prt$rate:
lda mdm$tp
ana b
mvi c,ilp
jnz mex
pop h
scan$prt$rate:
mov a,m
inx h
ora a
jrnz scan$prt$rate
ipchl:
pchl
;
;
cmdtbl:
db '11','0'+80h
dw ok110
db '30','0'+80H
dw ok300
db '60','0'+80h
dw ok600
db '120','0'+80H
dw ok1200
db 0
ok110:
xra a
db 21h ; lxi h,mvi a,1
ok300:
mvi a,1
db 21h ; lxi h,mvi a,3
ok600:
mvi a,3
db 21h ; lxi h,mvi a,5
ok1200:
mvi a,5
push psw
call set$nxt$parm
pop psw
NEW$BAUD:
cpi 5+1 ; make sure not greater
cmc ; ..then 1200 baud (5)
rc ; return with carry set
mov b,a ; ..if bad baud rate
add b ; 2X
add b ; 3X
mov e,a
mvi d,0 ; three bytes per table entry
lxi h,baud$table
dad d
lda mdm$tp ; 4 lsb's tell baud supported
ana m ; mask with desired rate
cmc
rz ; exit if bad baud rate (with Cy set)
mov a,b
sta mspeed ; set Modem Speed
inx h
mov a,m ; get speed byte
sta clock
inx h
mov a,m ; get baud rate byte
reset$baud:
push psw
mvi e,3ch ; offset to jmp devtbl
call vector$1 ; returns HL=char device table start
lxi d,dev$no*8+7 ; offset to RS232 baud rate
dad d ; point to RS232 baud rate byte
pop psw
mov m,a ; change baud rate
mvi c,dev$no ; init RS232 baud rate
mvi e,3fh ; offset to jmp ?cinit
call vector$1
ana a ; Cy cleared, baud rate set OK
ret
vector$1:
lhld 01
mov l,e
pchl
;
;
;
set$nxt$parm:
mvi c,gnc
call mex ; any arguments?
rc
ori 20h ; make lower case
lxi h,byte$type$tbl
chk$next:
cmp m ; match table entry?
inx h ; point to the mask
mov b,m ; get OR value (new data)
inx h ; point to the new value (to add in)
jrz change$type ; yes, go change type
inx h ; no, scan to next entry
mov b,m
inr b ; next entry a -1?
jrnz chk$next ; no, check next table entry
jr set$nxt$parm ; yes, skip this entry get the next one.
change$type:
mov a,m ; get mask value
lxi h,XxD$config ; point to system (RS232) config byte
ana m ; mask out old value
ora b ; OR in new value
mov m,a ; update config byte
sta local$config ; update boot value
jr set$nxt$parm ; see if any other parameters have changed
;
;
;
byte$type$tbl: ; or'ed value , MASK
db 'n',00000000b,00011111b
db 'o',11100000b,00011111b
db 'e',11000000b,00011111b
db 'm',10100000b,00011111b
db 's',10000000b,00011111b
db '7',00000000b,11111110b
db '8',00000001b,11111110b
db '1',00000000b,11111101b
db '2',00000010b,11111101b
db -1
;
;
; TABLE OF BAUDRATE PARAMETERS
;
baud$table:
db 1,20,3 ; 0 110
db 2,19,6 ; 1 300
db 0,0,0 ; 2 450 (not used)
db 4,17,7 ; 3 600
db 0,0,0 ; 4 710 (not used)
db 8,13,8 ; 5 1200
;
;
baudbuf:
db 10,0
ds 10
;
; NOTE: MUST TERMINATE PRIOR TO 0B00H (with Smartmodem)
; 0D00H (without Smartmodem)
;
org escchr ; change the ESC character to ESC
db esc
org xsize ; reduce buffer size (slow disk drives)
db 4
org queue ; turn off queueing (system
db 0 ; ..has 48 byte buff)
