303 lines
6.0 KiB
NASM
303 lines
6.0 KiB
NASM
.include "include/extern_symbols.s" ;include monitor symbols.
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org 0x8000
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call TermInit
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ret
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;-------------------------------------------------
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; Z8C/MEGA80 VDP Console IO Functions
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; by Dennis Gunia 2022/02
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; Version 0.1
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;
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; For Z8C Monitor
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;-------------------------------------------------
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; Constant Values
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TermVarMemoryLocation equ 0x40E0
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; Dynamic VARs
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TermVarTemplate:
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phase TermVarMemoryLocation ;Change pointers to this template to the specified location
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TermCurrentX: ; Start sector
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defb 0x01
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TermCurrentY: ; Start sector
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defb 0x04
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TermCursorState:
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defb 0x00
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TermCursorEnabled:
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defb 0x00
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TermVarTemplateEnd:
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dephase
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TermInit:
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; Copy TermVarTemplate to memory
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LD HL, TermVarMemoryLocation ;Load destination into HL
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LD BC, [TermVarTemplate] ;Load source into BC
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LD DE, [TermVarTemplateEnd] ;Load end into DE
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TermInit_copy_loop:
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LD A,(BC) ;Copy value
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LD (HL),A
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INC BC ;Increment pointers
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INC HL
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PUSH HL ;Backup HL
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SBC HL,DE ;Check if next pointer matches end
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POP HL ;Restore HL
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JP NZ, TermInit_copy_loop ;Loop if pointer != end
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; template copy done
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; install font
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call setup_vars
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ld hl, TmsFont
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call TmsTextMode ; initialize text mode
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ld a, TmsDarkRed ; set colors
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call TmsBackground
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ld a, TmsWhite
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call TmsTextColor
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ld a, 0 ; put title at 11, 1
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ld e, 0
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call TmsTextPos
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ld hl, TitleMessage ; output title
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call TmsStrOut
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ld a, 0 ; put title at 11, 1
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ld e, 4
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call TmsTextPos
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ret
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TermSetCursor:
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ld a, (TermCurrentY)
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ld e, a
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ld a, (TermCurrentX)
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call TmsTextPos
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ret
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TermPrintStr:
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; BC contains String offset
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; Prints null terminated string
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PUSH AF
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PUSH BC
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TermPrintStr_LOOP:
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LD A,(BC)
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; Return if nullbyte
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OR 0
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JR Z, TermPrintStr_EXIT
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; Print Char
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CALL TermPrintChar
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; INC BC and JP start of loop
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INC BC
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jp TermPrintStr_LOOP
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TermPrintStr_EXIT:
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POP BC
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POP AF
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RET
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TermPrintChar:
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push AF
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push BC
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push DE
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push HL
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; check if special char
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cp 0x7F ; Backspace
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jp z, TermPrintCharSPDelete
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cp 13
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jp z, TermPrintCharSPCR
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cp 10
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jp z, TermPrintCharSPLF
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; a has char
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call TmsChrOut
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ld a,(TermCurrentX)
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inc a
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cp 39
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jp z,TermPrintCharWrap; if line end
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jp nc,TermPrintCharWrap; if line end
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ld (TermCurrentX), a
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call TermSetCursor
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jp TermPrintCharDone
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TermPrintCharWrap:
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xor a
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ld (TermCurrentX), a
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ld a,(TermCurrentY)
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cp 23 ; if already last line
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jp z, TermPrintCharSPLFScroll
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inc a
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ld (TermCurrentY),a
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call TermSetCursor
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jp TermPrintCharDone
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TermPrintCharSPDelete:
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ld a,(TermCurrentX)
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and a
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jp z, TermPrintCharSPDeleteWrap ; if at pos X 0 then go previous line
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dec a ; else decrement X
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ld (TermCurrentX), a
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call TermSetCursor
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ld a, " "
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call TmsChrOut
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call TermSetCursor
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jp TermPrintCharDone
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TermPrintCharSPDeleteWrap:
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ld a,39
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ld (TermCurrentX), a
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ld a,(TermCurrentY)
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dec a
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ld (TermCurrentY),a
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call TermSetCursor
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ld a, " "
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call TmsChrOut
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call TermSetCursor
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jp TermPrintCharDone
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TermPrintCharSPLF: ; linefeed
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ld a,(TermCurrentY)
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cp 23 ; if already last line
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jp z, TermPrintCharSPLFScroll
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inc a
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ld (TermCurrentY),a
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call TermSetCursor
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jp TermPrintCharDone
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TermPrintCharSPLFScroll:
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call TermScroll
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ld a,23
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ld (TermCurrentY),a
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call TermSetCursor
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jp TermPrintCharDone
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TermPrintCharSPCR: ; linefeed
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xor a
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ld (TermCurrentX),a
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call TermSetCursor
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jp TermPrintCharDone
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TermPrintCharDone:
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pop HL
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pop DE
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pop BC
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pop AF
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ret
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TermScroll:
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ld bc, 0x3800 ; load start of text-buffer into pointer
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TermScrollLine:
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ld h,b
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ld l,c
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ld de, 40 ; line width
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add hl, de
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ld a,l ; setup VDP address
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out (0x81),a
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ld a,h
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and 3fh
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out (0x81),a
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call VDPWait
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in a, (0x80) ; read byte
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push af
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ld a,c ; setup VDP address
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out (0x81),a
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ld a,b
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and 3fh
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or 40h ; write bit
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out (0x81),a
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pop af
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call VDPWait
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out (0x80),a
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inc bc
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ld h,b
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ld l,c
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ld de, VDPTextBufferEnd ; buffer end
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sbc hl, de
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jp nz, TermScrollLine
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; clear last line
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ld bc,920
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ld a,c ; setup VDP address
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out (0x81),a
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ld a,b
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and 3fh
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or 40h ; write bit
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out (0x81),a
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ld c,40
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TermScrollClearLine:
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ld bc, 0x3800 + 920
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TermScrollClearLineLoop:
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ld a,c ; setup VDP addressh
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out (0x81),a
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ld a,b
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and 3fh
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or 40h ; write bit
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out (0x81),a
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ld a, ' '
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out (0x80),a
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call VDPWait
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inc bc
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ld h,b
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ld l,c
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ld de, 0x3800 + 960 ; buffer end
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sbc hl, de
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jp nz, TermScrollClearLineLoop
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ret
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VDPWait:
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nop
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nop
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nop
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nop
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ret
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VDPTextBufferStart equ 0
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VDPTextBufferEnd equ 0x3800 + 920
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TitleMessage:
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db ' Z8C Mk IV - A Z80 Homebrew Computer '
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db ' ROM Ver. 1.0 by Dennis Gunia (2022) '
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db ' 48k RAM - 4MHz Z80 CPU ',0
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TmsSubs:
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.include "tms.s" ; TMS graphics routines
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; .include "utility.s" ; BDOS utility routines
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.include "font1.s"
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TermClear:
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ld bc, 0x3800
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TermClearLoop:
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ld a,c ; setup VDP addressh
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out (0x81),a
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ld a,b
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and 3fh
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or 40h ; write bit
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out (0x81),a
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ld a, ' '
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out (0x80),a
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call VDPWait
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inc bc
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ld h,b
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ld l,c
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ld de, 0x3800 + 960 ; buffer end
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sbc hl, de
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jp nz, TermClearLoop
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xor a
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ld (TermCurrentX), a
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ld (TermCurrentY), a
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call TermSetCursor
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ret |