;******************************
;
; IBM 3101 Terminal Driver
;
;******************************
;1.0 03-Oct-84 DFP written at @LMS by David Pallmann.
ASMMSG "IBM 3101 Terminal Driver"
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OBJNAM IBM.TDV
TFEATS=TD$EOS!TD$EOL!TD$MLT
ESC=33
;*********
; IBM
;*********
;Terminal driver communications area
IBM: WORD TD$NEW ; terminal attributes
BR JMPINP ; input routine
RTN ; output routine
BR ECHO ; echo routine
BR JMPCRT ; crt control
RTN ; no init routine yet
WORD 0 ; no impure area yet
BYTE 24. ; number of rows
BYTE 80. ; number of columns
LWORD TFEATS ; terminal has:
; insert/delete line
; insert/delete character
; dim video attribute
; erase to end of screen
; erase to end of line
; multi-byte keystrokes
JMPINP: JMP INP ; go handle input characters
JMPCRT: JMP CRT ; go handle tcrt codes
;********************
;* ECHO *
;********************
;Special echo processing is performed here
;Rubouts will backspace and erase the previous character
;Control-U will erase the entire line by backspacing and erasing
ECHO: CMPB D1,#25 ; control-u
BEQ CTRLU
CMPB D1,#177 ; rubout
BNE ECHX
;Rubouts are handled by the old backspace-and-erase game
;Special handling must be performed if we are rubbing out a tab
;D6 contains the character being rubbed out
RUBOUT: CMPB D6,#11 ; was it a tab?
BEQ RBTB ; yes
;Rubout was of a printable character - queue up the backspace sequence
KRTG: MOV #3,D3 ; set character count
LEA A6,ERUB ; set buffer address
MOV A6,D1 ; into d1
TRMBFQ ; queue the backspace sequence
RTN
ERUB: BYTE 10,40,10,0
;Rubout was of a tab - we must calculate how big the tab was and backup over it
RBTB: CLR D3 ; preclear D3
MOVW T.POB(A5),D3 ; set beginning position count
MOV T.ICC(A5),D2 ; set input character count
MOV T.IBF(A5),A6 ; set input buffer base
KRTS: DEC D2 ; done with scan?
BMI KRTQ ; yes
MOVB (A6)+,D1 ; scan forward calculating position
CMPB D1,#11 ; tab
BEQ KRTT
CMPB D1,#15 ; cr
BEQ KRTC
CMPB D1,#ESC ; altmode
BEQ KRTI
CMPB D1,#40 ; control-char
BLO KRTS
CMPB D1,#172
BHI KRTS
KRTI: INC D3 ; increment position for one character
BR KRTS
KRTT: ADD #10,D3 ; adjust position for tab
AND #^C7,D3
BR KRTS
KRTC: CLR D3 ; clear position for cr
BR KRTS
KRTQ: COM D3 ; calculate necessary backspaces
AND #7,D3
INC D3
MOV #10,D1 ; set immediate backspace character
TRMBFQ ; queue the backspaces
ECHX: RTN
;Echo a control-u by erasing the entire line
CTRLU: TST D6 ; no action if nothing to erase
BEQ CTUX
CLR D3 ; preclear D3
MOVW T.POO(A5),D3 ; calculate backspace number to erase the line
SUBW T.POB(A5),D3
BEQ ECHX
CMP D3,T.ILS(A5) ; insure not greater than terminal width
BLOS CLUA
MOV T.ILS(A5),D3
CLUA: MOV #10,D1 ; queue up backspaces
TRMBFQ
ASL D1,#2 ; queue up spaces
TRMBFQ
MOV #10,D1 ; queue up backspaces
TRMBFQ
CTUX: RTN
;********************
;* INP *
;********************
;Input character processing subroutine
;Return a negative flag to indicate possible multi-byte key codes
;Detect a negative flag which indicates the multi-byte processing return
INP: BMI INMLT ; skip if multi-byte processing
CMPB D1,#ESC ; escape?
BEQ INPM ; yes - could be multi-byte sequence
LCC #0 ; no - normal processing
RTN
INPM: LCC #PS.N ; possible multi-byte - return N flag
RTN
;Multi-byte processing is done here
;This occurs when TRMSER has accumulated all bytes of a multi-byte keystroke
;D0 contains the character count and A0 indexes the data string
;A5 indexes the terminal definition block and must be preserved
;The translated character must be returned in D1 for storage
;This routine may destroy only A0,A3,A6,D0,D6,D7
INMLT: MOVB (A0)+,D1 ; get the first character
DECB D0 ; no translation if single character
BEQ INMX
CMPB D1,#ESC
BNE INMX
;Escape sequences are translated directly by setting bit 7 on
;This will cause them to map to 240-377
ESCAPE: MOVB (A0)+,D1 ; get the second character
LEA A0,ESCTBL ;point to translation table
10$: TSTB @A0 ;end of table?
BEQ INMX ; yes - escape sequence is invalid
CMMB (A0)+,D1 ;match?
BEQ 20$ ; yes
INC A0 ; no - increment index
BR 10$ ; and try next table entry
20$: MOVB @A0,D1 ;put translated char in D1
BR INMX ; and return to program
;********************
;* CRT *
;********************
;Special crt control processing
;D1 contains the control code for X,Y positioning or special commands
;If D1 is positive we have screen positioning (row in hi byte, col in lo byte)
;If D1 is negative we have the special command in the low byte
CRT: TSTW D1 ; is it cursor position?
BMI CRTU ; no
;Special commands - D1 contains the command code in the low byte
CRTU: AND #377,D1 ; strip the high byte
;Command processing per director tables
PUSH A2 ; save A2
ASL D1 ; times 2 (word offset).
CMP D1,#CRCB-CRCA ; check for valid code
BHI CRTX ; and bypass if bad
LEA A2,CRCA ; index the table
ADD D1,A2 ; add command code
MOVW @A2,D1 ; pick up data field offset
ADD D1,A2 ; make absolute data address
TTYL @A2 ; print the data field
CRTX: POP A2 ; restore A2
RTN
;Escape sequence translation table
;
EXTB: BYTE 67,73,105,111,120,121,122,124,127,131,377,377
EVEN
;Byte offset and data tables follow for all commands
;
CRCA: WORD C0-.,C1-.,C2-.,C3-.,C4-.,C5-.,C6-.,C7-.
WORD C8-.,C9-.,C10-.,C11-.,C12-.,C13-.,C14-.,C15-.
WORD C16-.,C17-.,C18-.,C19-.,C20-.,C21-.,C22-.,C23-.
WORD C24-.,C25-.,C26-.,C27-.,C28-.,C29-.
WORD C30-.,C31-.,C32-.,C33-.,C34-.,C35-.,C36-.,C37-.,C38-.,C39-.
WORD C40-.,C41-.,C42-.,C43-.,C44-.,C45-.,C46-.,C47-.,C48-.,C49-.
WORD C50-.,C51-.,C52-.,C53-.,C54-.,C55-.,C56-.,C57-.,C58-.,C59-.
WORD C60-.,C61-.,C62-.,C63-.,C64-.,C65-.,C66-.,C67-.,C68-.,C69-.
WORD C70-.,C71-.,C72-.,C73-.,C74-.,C75-.,C76-.,C77-.,C78-.,C79-.
WORD C80-.,C81-.,C82-.,C83-.,C84-.,C85-.,C86-.,C87-.,C88-.,C89-.
WORD C90-.,C91-.,C92-.,C93-.,C94-.,C95-.,C96-.,C97-.,C98-.,C99-.
WORD C100-.,C101-.,C102-.,C103-.,C104-.,C105-.
CRCB:
PAGE
;***************************
;
; Special CRT Functions
;
;***************************
C0: BYTE ESC,'L,0 ;clear screen
C1: BYTE ESC,'H,0 ;cursor home
C2: BYTE 15,0 ;cursor return
C3: BYTE ESC,'A,0 ;cursor up
C4: BYTE ESC,'B,0 ;cursor down
C5: BYTE ESC,'D,0 ;cursor left
C6: BYTE ESC,'C,0 ;cursor right
C7: BYTE ESC,':,0 ;lock keyboard
C8: BYTE ESC,';,0 ;unlock keyboard
C9: BYTE ESC,'I,0 ;erase to end of line
C10: BYTE ESC,'J,0 ;erase to end of screen
C11: ;enter backgroud display mode (reduced intensity).
C12: ;enter foreground display mode (normal intensity)
C13: ;enable protected fields
C14: ;disable protected fields
C15: ;delete line
C16: ;insert line
C17: ;delete character
C18: ;insert character
C19: ;read cursor address
C20: ;read character at current cursor position
C21: ;start blink field
C22: ;end blink field
C23: ;start line drawing mode (enable alternate character set)
C24: ;end line drawing mode (disable alternate character set)
C25: ;set horizontal position
C26: ;set vertical position
C27: ;set terminal attributes
C28: ;cursor on
C29: ;cursor off
C30: ;start underscore [102]
C31: ;end underscore [102
C32: ;start reverse video [102]
C33: ;end reverse video [102]
C34: ;start reverse blink [102]
C35: ;end reverse blink [102]
C36: ;turn off screen display [102]
C37: ;turn on screen display [102]
C38: ;top left corner
C39: ;top right corner
C40: ;bottom left corner
C41: ;bottom right corner
C42: ;top intersect
C43: ;right intersect
C44: ;left intersect
C45: ;bottom intersect
C46: ;horizontal line
C47: ;vertical line
C48: ;intersection
C49: ;solid block
C50: ;slant block
C51: ;cross-hatch block
C52: ;double line horizontal
C53: ;double line vertical
C54: ;send message to function key line
C55: ;send message to shifted function key line
C56: ;set normal display format
C57: ;set horizontal split (follow with row code)
C58: ;set vertical split (39 char columns)
C59: ;set vertical split (40 char columns)
C60: ;set vertical split column to next char
C61: ;activate split segment 0
C62: ;activate split segment 1
C63: ;send message to host message field
C64: ;up-arrow
C65: ;down-arrow
C66: ;raised dot
C67: ;end of line marker
C68: ;horizontal tab symbol
C69: ;paragraph
C70: ;dagger
C71: ;section
C72: ;cent sign
C73: ;one-quarter
C74: ;one-half
C75: ;degree
C76: ;trademark
C77: ;copyright
C78: ;registered
C79: ;print screen
C80: ;reserved for set to wide mode
C81: ;reserved for set to normal mode
C82: ;enter transparent print mode
C83: ;exit transparent print mode
C84: ;begin writing to alternate page
C85: ;end writing to alternate page
C86: ;toggle page
C87: ;copy to alternate page
C88: ;insert column
C89: ;delete column
C90: ;block fill with attribute
C91: ;block fill with character
C92: ;draw a box
C93: ;scroll box up one line
C94: ;scroll box down one line
C95: ;select jump scroll
C96: ;select fast smooth scroll
C97: ;select med-fast smooth scroll
C98: ;select med-slow smooth scroll
C99: ;select slow smooth scroll
C100: ;start underscore/blink
C101: ;end underscore/blink
C102: ;start underscore/reverse
C103: ;end underscore/reverse
C104: ;start underscore/reverse/blink
C105: BYTE 0 ;end underscore/reverse/blink
EVEN
