Source Code 1992 March/Source_Code_CD-ROM_Walnut_Creek_March_1992.iso/msdos/asmutl/a86cnvrt.arc/S3.8

Text File | 1987-06-16 | 18KB | 455 lines

; SETUP is a memory-resident program that sends control codes to an
;    Epson-compatible printer. After SETUP is installed, it may be invoked
;    at any time by pressing the CTRL and the right-SHIFT keys simultaneuosly.
;    This causes a window to pop up, inviting the user to press a choice
;    of function keys to send codes to the printer.  The window is deactivated
;    when the ESC key is pressed.

  JMP INITIALIZE               ; goto initialization routine

 DB '(C) Copyright 1986, Ziff-Davis Publishing Company ',01A

KEYBOARD_INT  DD  0:(09 * 4)
MACHINE_ID    DD  0F000:0FFFE
CURSOR_MODE   DD  040:060

COLUMN_COUNT   DW ?            ; width of window in columns
CURSOR_TYPE    DW ?            ; cursor scan line definition
WINDOW_ACTIVE? DB 0            ; indicates if printer window is already active
DISPLAY_MODE   DW ?            ; current crt display mode
PAGE_NUMBER    DW ?            ; current displayed page
ATTRIBUTE1     DB 4FH          ; window attribute bytes
ATTRIBUTE2     DB 70H

DISPLAY_TABLE  DB 2DH,29H      ; display re-enable values for modes 2 and 3
VIDEO          DW 0B800,0B900  ; starting addresses of video memory for CGA
               DW 0BA00,0BB00

MONO_VIDEO     DW 0B000H       ; video segment address for
                               ; monochrome adapter

OLD_KB_INT    DD ?             ; storage for old keyboard interrupt vector


; Text of the Printer Setup Menu window.
; After initialization, text and attribute bytes are combined and stored
; in the WINDOW_IMAGE area, and this area is used to store the contents of
; the screen that underlie the window when the window is called up.

WINDOW_SOURCE:
  DB 201,        26 DUP 205          ,187
  DB 186,'    PRINTER SETUP MENU    ',186
  DB 186,'   EPSON RX/FX PRINTERS   ',186
  DB 199,        26 DUP 196          ,182
  DB 186,' F1    Compressed Mode    ',186
  DB 186,' F2    Expanded Mode      ',186
  DB 186,' F3    Emphasized Mode    ',186
  DB 186,' F4    Double-Strike Mode ',186
  DB 186,' F5    Elite Mode         ',186
  DB 186,' F6    Miniature Mode     ',186
  DB 186,' F7    Skip Perforation   ',186
  DB 186,' F8    Indent Left Margin ',186
  DB 186,' F9    Reset Top-of-Form  ',186
  DB 186,' F10   Reset Print Modes  ',186
  DB 186,' ESC   Exit               ',186
  DB 199,        26 DUP 196          ,182
  DB 186,' Unshifted:   Toggle ON   ',186
  DB 186,' Shifted:     Toggle OFF  ',186
  DB 200,        26 DUP 205          ,188
  DB 532 DUP (?)

; Storage area for the combination of text and attribute bytes that
; form the window image.

WINDOW_IMAGE:
  DW 532 DUP ?

; Control code strings for all of the printer setup options.

CODE_TABLE:
  DB 15,255,14 DUP 0                   ; compressed mode on
  DB 27,87,1,255,12 DUP 0              ; expanded mode on
  DB 27,69,255,13 DUP 0                ; emphasized mode on
  DB 27,71,255,13 DUP 0                ; double-strike mode on
  DB 27,77,255,13 DUP 0                ; elite mode on
  DB 15,27,83,0,27,65,6,255,8 DUP 0    ; miniature mode on
  DB 27,78,12,255,12 DUP 0             ; perfskip on
  DB 27,108,10,255,12 DUP 0            ; indent left margin
  DB 27,67,66,255,12 DUP 0                           ; reset top-of-form
  DB 18,27,87,0,27,70,27,72,27,80,27,84,27,50,255,0  ; reset print modes
  DB 18,255,14 DUP 0                                 ; compress off
  DB 27,87,0,255,12 DUP 0              ; expand off
  DB 27,70,255,13 DUP 0                ; emphasize off
  DB 27,72,255,13 DUP 0                ; double-strike off
  DB 27,80,255,13 DUP 0                ; elite off
  DB 18,27,84,27,50,255,10 DUP 0       ; miniature off
  DB 27,79,255,13 DUP 0                ; perfskip off
  DB 27,108,0,255,12 DUP 0             ; indent off



; OUR_HANDLER is our replacement for the INT 9 keyboard handler.  We save
;    registers, then call the old keyboard handler.  If CTRL+RIGHT_SHIFT is
;    pressed, we activate our code.  Otherwise, we exit as if we were the
;    old handler.

OUR_HANDLER:
  STI                       ; enable software interrupts
  PUSH AX,BX,CX,DX,SI,DI    ; save all registers
  PUSH DS,ES
  PUSH AX                   ; save ax for call to old routine
  IN AL,0A0H                ; re-enable NMI on PCjr
  POP AX                    ; restore ax
  PUSHF                     ; simulate interrupt call to old keyboard routine
  CS CALL OLD_KB_INT        ; call old routine
  MOV AH,2                  ; check status of the shift keys
  INT 16H
  AND AL,5                  ; Ctrl and Rt-Shift depressed?
  CMP AL,5
  JE >L1                    ; yes, then skip exit routine
EXIT:                       ;  common exit point
  POP ES,DS
  POP DI,SI,DX,CX,BX,AX
  IRET                      ; return from interrupt

; Execution comes here when the proper key combination, Ctrl/Rt-Shift, is
; pressed. First task is to check whether or not the window is already open.

L1:
  MOV DS,ES,CS           ;  set es and ds to the code segment
  TEST WINDOW_ACTIVE?    ; is the window already open?
  JNZ EXIT               ; yes, then ignore request

; Check current video mode. If it's mode 2, 3, or 7, then set the window
; status flag, store the mode number and page number, save the cursor type,
; and hide the cursor. If any other display mode is active instead, ignore
; the request and exit.

  MOV AH,15            ; get page and mode numbers
  INT 10H              ; al=mode, bh=page
  CMP AL,2             ; is crt now in an acceptable mode?
  JE >L0               ; yes, then continue
  CMP AL,3
  JE >L0
  CMP AL,7
  JE >L0
  JMP EXIT

L0:
  CLD                     ; all string scanning is forward
  INC WINDOW_ACTIVE?      ; store the fact that the window is now active
  MOV AH,0                ; extend the mode number AL to AX
  MOV DISPLAY_MODE,AX     ; save the mode number
  PUSH BX
  MOV BL,BH               ; save page number for color displays
  MOV BH,0
  MOV PAGE_NUMBER,BX
  POP BX
  MOV AH,3                ; get cursor type
  INT 10H
  MOV CURSOR_TYPE,CX      ; save it
  MOV AH,1                ; hide the cursor until later
  MOV CH,20H
  INT 10H                 ;

; Preparatory routines are completed. Now open the window by first saving the
; contents of video memory beneath the window and then writing the window text
; directly to memory.

  MOV BX,PAGE_NUMBER       ; use BX as index into video segment address table
  CMP DISPLAY_MODE,7       ; manually adjust index for monochrome adapter
  IF E MOV BX,4
  SHL BX,1                 ; multiply BX by two since table is made up of words
  MOV AX,VIDEO[BX]         ; read segment from table
  CMP DISPLAY_MODE,7       ; skip disable if in mode 7
  MOV DS,AX                ; DS set to video memory
  IF NE CALL VIDEO_DISABLE ; turn display off for snow-free writing
  MOV DI,WINDOW_SOURCE     ; set DI to buffer area to save screen contents
  MOV CX,28 BY 19          ; define window dimensions and location
  MOV DX,2 BY 26
  CALL VIDEO_TO_MEM        ; then transfer screen contents to buffer
  MOV ES,DS                ; set ES to video memory
  MOV DS,CS                ; reset DS to code segment
  LEA SI,WINDOW_IMAGE      ; point SI to window image
  MOV CX,28 BY 19          ; define window region
  MOV DX,2 BY 26
  CALL MEM_TO_VIDEO        ; and write the window to the display
  CMP DISPLAY_MODE,7       ; skip enable if in mode 7
  IF NE CALL VIDEO_ENABLE  ; re-enable the video display
  JMP SHORT NEXT_KEY


; ESC_SEEN is jumped to when the ESC key is pressed. The window is refilled
;     with its original contents, the cursor is restored, and control is handed
;     back to the application program.

ESC_SEEN:
  CMP DISPLAY_MODE,7       ; are we in monochrome mode?
  IF NE CALL VIDEO_DISABLE ; if not then turn off the display
  MOV SI,WINDOW_SOURCE     ; point SI to the buffer area
  MOV CX,28 BY 19          ; define the window
  MOV DX,2 BY 26
  CALL MEM_TO_VIDEO        ; write the buffer contents to the display
  CMP DISPLAY_MODE,7       ; are we in monochrome mode?
  IF NE CALL VIDEO_ENABLE  ; if not then turn display back on
  MOV AH,1                 ; restore cursor
  MOV CX,CURSOR_TYPE
  INT 10H
  MOV WINDOW_ACTIVE?,0     ; the window is no longer active
  JMP EXIT                 ; exit back to the interrupted user program



; NEXT_KEY is the main loop for the interactive portion of our handler.  We
;    intercept all keystrokes while our window is open, and act on them.
;    This interactive mode is terminated when the ESC key is seen.

BEEP_KEY:           ; jump here if an illegal key is seen
  CALL BEEP         ; beep and wait for another keypress
NEXT_KEY:
  MOV AH,0          ; BIOS function code for GET_KEY
  INT 16H           ; fetch a keystroke from the BIOS
  CMP AL,27         ; is it the ESC key?
  JE ESC_SEEN       ; jump if it is, to exit our interactive mode
  CMP AL,0          ; is it an extended code?
  JNE BEEP_KEY      ; error if not
  MOV AL,AH         ; move the extended code into AL, for examination
  CMP AL,59         ; less than F1?
  JB BEEP_KEY       ; yes, then don't accept it
  CMP AL,91         ; greater than Shft-F8?
  JA BEEP_KEY       ; yes, then don't accept it
  CMP AL,68         ; between F1 and F10?
  JBE UNSHIFTED     ; yes
  CMP AL,84         ; between Shft-F1 and Shft-F9?
  JAE SHIFTED       ; yes
  JMP BEEP_KEY      ; if all tests failed, then keypress was illegal

; If a legal function key was pressed, its scan code is translated here to the
; starting address of the string of bytes to be sent to the printer. The
; string is then sent to LPT1: provided it's powered on and on-line.

SHIFTED:
  SUB AL,15                ; adjustment for shifted function keys
UNSHIFTED:
  SUB AL,59                ; adjustment for unshifted function keys
  MOV AH,0
  MOV CL,4                 ; multiply ax by 16
  SHL AX,CL
  ADD AX,CODE_TABLE        ; convert ax to full offset address
  MOV SI,AX                ; and transfer it to si
  CALL LPT1_ERROR?         ; check for printer ready
  JNZ BEEP_KEY             ; beep if printer not ready
  MOV BL,255               ; specify delimiter for call to LPRINTZ
  CALL LPRINTZ             ; send control code string to printer
  JMP NEXT_KEY             ; return for another keypress



; VIDEO_ENABLE and VIDEO_DISABLE manipulate bit 3 of port 3D8h, the CGA Mode
;    Control Register, to temporarily turn the display on or off. Since these
;    routines write directly to hardware, they have no effect on other video
;    adapters.

VIDEO_DISABLE:
  MOV DX,03DA              ; read CGA status port
L1:
  IN AL,DX                 ; wait for vertical retrace to occur
  TEST AL,8                ; is bit 3 set?
  JE L1                    ; no, wait until it is
  MOV DX,03D8              ; now disable the display
  MOV AL,025               ; by clearing bit 3 of the Mode Control Register
  OUT DX,AL
  RET

VIDEO_ENABLE:
  MOV DX,03D8              ; CGA Mode Control Register
  MOV BX,DISPLAY_MODE      ; get value to re-enable display
  MOV AL,DISPLAY_TABLE[BX-2]
  OUT DX,AL                ; and send it to the port
  RET



; VIDEO_TO_MEM copies a window (size CH columns by CL lines) from row DH,
;    column DL of the video segment DS, to a memory buffer at ES:DI.

VIDEO_TO_MEM:
  MOV AL,CH                ; store number of columns
  MOV AH,0
  MOV COLUMN_COUNT,AX
  MOV CH,0                 ; CX = number of lines
  PUSH DI                  ; save DI
  CALL VIDEO_OFFSET        ; get cell address of first character
  MOV SI,DI                ; put it in SI
  POP DI                   ; restore DI
L1:
  PUSH SI,CX               ; save next line pointer and line count
  MOV CX,COLUMN_COUNT      ; load the number of columns in the line
  REP MOVSW                ; transfer one line
  POP CX,SI                ; restore saved registers
  ADD SI,160               ; set si for next line address
  LOOP L1                  ; loop until all lines are done
  RET



; MEM_TO_VIDEO writes a window (size CH columns by CL lines), from memory at
;   DS:SI to the video segment ES, row DH, column DL.

MEM_TO_VIDEO:
  MOV AL,CH                ; save number of columns
  MOV AH,0
  MOV COLUMN_COUNT,AX
  MOV CH,0                 ; cx = number of lines
  CALL VIDEO_OFFSET        ; get offset into video memory
L1:
  PUSH DI,CX               ; save video starting address and line count
  MOV CX,COLUMN_COUNT      ; load the number of columns in the line
  REP MOVSW                ; transfer one line
  POP CX,DI                ; restore registers
  ADD DI,160               ; set di for next display line
  LOOP L1                  ; loop until done
  RET



; VIDEO_OFFSET sets DI to the offset within the video memory segment of row
;    DH (0-24), column DL (0-79).

VIDEO_OFFSET:
  MOV AL,160
  MUL DH                   ; row * 160
  SHL DL,1                 ; column * 2
  MOV DH,0                 ; byte to word
  ADD AX,DX                ; (row *160)+(column*2)
  MOV DI,AX                ; set offset in di
  RET


; LPRINTZ routine sends a string of bytes, delimited by BL, from DS:SI to
;    LPT1: thru INT 17h.

L1:
  MOV DX,0          ; printer no. 0 (LPT1:)
  MOV AH,0
  INT 17H           ; send byte to printer
LPRINTZ:
  LODSB             ; get one byte
  CMP AL,BL         ; is it the delimiter?
  JNE L1            ; loop if not, to output the byte
  RET


; LPT1_ERROR? checks the current status of printer LPT1:. If it's either
; powered off or off-line, then we return NZ to signal an error condition.
; If LPT1 is ready, we return Z.

LPT1_ERROR?:
  MOV DX,0          ; printer no. 0
  MOV AH,2          ; use ROM BIOS 'get status' function
  INT 17H           ; status is returned in AH
  TEST AH,8         ; test bit 3, I/O error indicator
  RET               ; Z means ready, NZ means error


; BEEP uses the 8253 timer chip to emit a short beep thru the PC's speaker.

BEEP:
  MOV AL,182        ; notify 8253 that frequency data is coming
  OUT 67,AL
  MOV AL,0          ; send frequency (776.8 Hz)
  OUT 66,AL
  MOV AL,6
  OUT 66,AL
  IN AL,97          ; activate speaker
  OR AL,3
  OUT 97,AL
  MOV CX,6000H      ; time delay for sound duration
L1:
  LOOP L1
  IN AL,97          ; deactivate speaker
  AND AL,NOT 3
  OUT 97,AL
  RET



; Initialization routine sets up the window image in the WINDOW_IMAGE area,
; resets the CURSOR_MODE word if this is a PCjr, and saves and replaces the
; old keyboard interrupt vector.

INITIALIZE:

; Initialize the window text area by combining the text data with the attribute
; bytes and placing the conglomeration in the WINDOW_IMAGE area.

  CLD                  ; string scanning is forward
  MOV AH,15            ; check the current video mode
  INT 10H
  CMP AL,7             ; if it's mode 7, then replace the attribute
  JNE >L0              ; bytes with ones appropriate for mono adapter
  MOV ATTRIBUTE1,70H
  MOV ATTRIBUTE2,07H
L0:                    ; now combine the text and attribute bytes
  LEA SI,WINDOW_SOURCE ; point SI to table of text
  LEA DI,WINDOW_IMAGE  ; point DI to the storage area
  MOV CX,112           ; create first four lines by combining text with
  MOV AL,ATTRIBUTE1    ;     ATTRIBUTE1 (112 words)
L1:
  MOVSB                ; text byte
  STOSB                ; attribute byte
  LOOP L1              ; loop until all 112 words are done
  MOV CX,11            ; now do the next 11 lines
L2:
  PUSH CX              ; first attribute in each line is ATTRIBUTE1
  MOVSB
  STOSB
  MOV CX,26            ; next 26 attributes are ATTRIBUTE2
  MOV AL,ATTRIBUTE2
L3:
  MOVSB
  STOSB
  LOOP L3
  MOVSB
  MOV AL,ATTRIBUTE1    ; and the last in each line is ATTRIBUTE1
  STOSB
  POP CX
  LOOP L2              ; loop until all 11 lines are done
  MOV CX,112           ; create the last four lines just like the first four
L4:
  MOVSB
  STOSB
  LOOP L4

; Check the machine ID byte in ROM and if this is a PCjr, then reset the
; cursor and correct the CURSOR_MODE word at 0040:0060.

  LES DI,MACHINE_ID     ; point to the identification byte for this machine
  MOV AL,0FD            ; load the ID to the PCJr
  SCASB                 ; is this a PCJr?
  JNE >L5               ; no, then skip this routine
  LES DI,CURSOR_MODE    ; point to the BIOS's cursor mode indicator
  MOV AX,0607           ; load our new value for the indicator
  STOSW                 ; store the new value
  XCHG CX,AX            ; swap the value into CX, for a BIOS call
  MOV AH,1              ; then physically reset the cursor
  INT 10H

; Now save the old keyboard interrupt vector and replace it with the new one.

L5:
  LDS SI,KEYBOARD_INT       ; point DS:SI to INT 9 in the vector table
  MOV DI,OFFSET OLD_KB_INT  ; point ES:DI to our storage for old INT 9 vector
  MOV ES,CS
  CLI                       ; disable all interrupts but NMI
  MOV AX,OUR_HANDLER        ; point to our new handler
  XCHG AX,[SI]              ; store new handler offset and fetch the old one
  STOSW                     ; store the old handler offset
  MOV AX,CS                 ; point to this code segment
  XCHG AX,[SI+2]            ; store new segment and fetch the old one
  STOSW                     ; store the old handler segment
  STI                       ; re-enable interrupts
  MOV DX,INITIALIZE         ; point dx to end of resident section
  INT 27H                   ; terminate-but-stay-resident