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Copy pathLynx_48k_Rom.ASM
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Lynx_48k_Rom.ASM
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;***********************************************************************
;*
;* Camputers Lynx 48k ROM disassembly (version L014)
;* -------------------------------------------------
;*
;* Reconstructed from lynx eprom memory images and supplemented with
;* information from Lynx User Magazine Issue 1 (Camputers, June 1983,
;* pages 16-18), Nilug News (Issue 6) by R.B.Poate, and Camputers
;* Lynx "Mark II" source code (dated: 1-Apr-1984).
;*
;* Disassembly, collation and formatting by: Mike Panter 06/11/2021.
;*
;* Additional credit to: Russell Davis (online archive of materials)
;* Pete Todd (knowledge, insight and Pale)
;*
;* WARNING: May contain inaccuracies - use at own risk.
;*
;* Free to distribute. Please include attribution.
;*
;********************** LABELS/SYMBOLS/PREFIXES ************************
;*
;* SYSVAR_ - RAM addresses used by the Lynx ROM routines
;* RST_ - Z80 Restarts
;* DATA_ - Data tables stored in rom (eg. PI)
;* E<command> - Lynx BASIC command
;* F<name> - Lynx BASIC functions/operators
;* I<name> - Validation of BASIC commands/functions.
;* MONITOR_ - Lynx MONITOR commands
;* VDU_ - VDU commands
;* SUB_ - internal subroutines used by ROM
;*
;* ---------------------------------------------------------------------
;* COMPILE/ASSEMBLE: z88dk-z80asm -b -mz80 Lynx_48k_Rom.asm
;* ---------------------------------------------------------------------
;*
;
; Lynx global definitions (see separate files)
;
PUBLIC INTFP, ERR_TYPE_MISMATCH, ERR_OUT_OF_DATA, ERR_NOT_YET_IMP, ERR_SYNTAX, SPACE
PUBLIC LNUM1, PN, TEST_IS_LOOP_END, SUB_INDENT, SKIP_LNUM, SUB_PRINT_KEYWORD, PRINT_BAS_LINE
PUBLIC PRINT_STRING, DISPLAY_SPACE, PNE1, DO_INDENT, IEND, _BEEP, D6845, ERR_BAD_TAPE
PUBLIC ERR_NUM_OUT_RANGE, ERR_OUT_OF_MEM, ERR_OVERFLOW, ERR_SOMETHG_MISSG, ERROR_PRINT
PUBLIC EXEC2, FLOAT_ZERO, FPINT, GET_VAR_ADDR, IDPOKE, IE4CR, IE6CR, IINK, ILOAD, IVRY
PUBLIC IREM, MOTOFF, RBYTE, READ_STRING_EXPR, READ_STRING_VAR, RP, RSYNC, STRING_EXEC
PUBLIC SUB_PLOT3, TAPE_READ, TEST_FOR_STR_EXP, TEST_FOR_STRING, TEST_IS_COMMA
PUBLIC VPTR_IS_STR, WRITE_FNAME, WSYNC, VROM, DFTW
;
; Lynx symbols and BASIC tokens
;
include "Lynx.def"
include "Tokens.def"
SECTION _48k_1
;
; Start. Disable interrupts. Jump to 3B.
;
BEGIN:
DI ;[0000]
LD A,$20 ;[0001]
OUT ($80),A ;[0003]
JP CRTC ;[0005]
;
; Output character in the A register
;
RST_8:
JP PUTCHAR ;[0008]
;
; Rom version identifier L014
;
LYNX_IDENT:
DB " L014" ;[000B]
;
; Checks if the character at the address pointed to by DE is a space.
; - If so, increments DE until it is not a space.
;
SPACE:
LD A,(DE) ;[0010]
CP ' ' ;[0011]
RET NZ ;[0013]
INC DE ;[0014]
JR SPACE ;[0015]
NOP ;[0017]
;
; Evaluates the reverse polish expression pointed to by DE as a binary integer in HL.
;
RST_18:
JP EINT ;[0018]
;
; Sue Jansons - who wrote the User Manual
;
SUSY:
DB "Susy",$00 ;[001B]
;
; Checks if the byte after RST is the same as A; if it is not, displays a syntax error.
;
RST_20:
EX (SP),HL ;[0020]
CP (HL) ;[0021]
INC HL ;[0022]
EX (SP),HL ;[0023]
RET Z ;[0024]
CALL ERR_SYNTAX ;[0025]
;
; Evaluates reverse polish expression pointed to by DE in floating point
; in WRA1 (working register area 1).
;
RST_28:
JP SUB_CHK_EXP_EVAL ;[0028]
DB 0,0,0,0,0 ;[002B]
;
; Jumps to monitor TRAP routine.
;
RST_30:
JP EMON ;[0030]
POP HL ;[0033] Has POP HL JP (HL)
JP (HL) ;[0034]
DB 0,0,0 ;[0035]
;
; NOT YET IMPLEMENTED. Jumps to RAM RSTRAM (see RAM variables).
;
RST_38:
JP SYSVAR_RSTRAM ;[0038]
;
; Initialise the 6845 CRT controller.
;
CRTC:
XOR A ;[003B]
LD BC,$FF7F ;[003C]
OUT (C),A ;[003F]
LD B,$10 ;[0041]
LD HL,D6845 ;[0043]
XOR A ;[0046]
CRTC1:
OUT ($86),A ;[0047]
EX AF,AF' ;[0049]
LD A,(HL) ;[004A]
OUT ($87),A ;[004B]
EX AF,AF' ;[004D]
INC A ;[004E]
INC HL ;[004F]
DJNZ CRTC1 ;[0050]
JP INIT ;[0052]
NOP ;[0055]
;
; CRT controller registers.
;
D6845:
DB $2F ;R0=h total ;[0056]
DB $20 ;R1=h displayed ;[0057]
DB $26 ;R2=h sync posn ;[0058]
DB $33 ;R3=h sync width ;[0059]
DB $4D ;R4=v total ;[005A]
DB $02 ;R5=v total adjust ;[005B]
DB $3F ;R6=v displayed ;[005C]
DB $44 ;R7=v sync posn ;[005D]
DB $00 ;R8=interlace ;[005E]
DB $03 ;R9=max scanline adr ;[005F]
DB $03 ;R10=cursor start ;[0060]
DB $03 ;R11=cursor end ;[0061]
DB $00 ;R12=start hi ;[0062]
DB $00 ;R13=start lo ;[0063]
DB $07 ;R14=cursor hi ;[0064]
DB $DF ;R15=cursor lo ;[0065]
;
; Non-maskable interrupt routine, pointer in RAM
;
NMI_JUMP:
JP SYSVAR_NMIRAM ;[0066]
;
; Reads byte in red/blue bank at HL into L, and H=0.
;
INBLUE:
LD A,$E8 ;[0069]
EX AF,AF' ;[006B]
LD A,$63 ;[006C]
JR INBANK ;[006E]
;
; Reads byte in green/alternative green bank at HL into L, and H=0.
;
INGREEN:
LD A,$E4 ;[0070]
EX AF,AF' ;[0072]
LD A,$65 ;[0073]
INBANK:
LD BC,$FF7F ;[0075]
OUT (C),A ;[0078]
LD A,$40 ;[007A]
OUT ($80),A ;[007C]
EX AF,AF' ;[007E]
OUT ($80),A ;[007F]
LD L,(HL) ;[0081]
XOR A ;[0082]
OUT ($80),A ;[0083]
OUT (C),A ;[0085]
LD H,A ;[0087]
RET ;[0088]
;
; Used by keyboard driver
;
DBNCE:
PUSH BC ;[0089]
LD BC,KDBNCE ;[008A]
CALL KBD_DLAY ;[008D]
POP BC ;[0090]
IN A,(C) ;[0091]
CPL ;[0093]
RET ;[0094]
AND (HL) ;[0095] Probably unused
LD B,B ;[0096]
SBC A,B ;[0097]
RET PE ;[0098]
RET Z ;[0099]
;
; Character Output Routine (via SYSVAR_VIDEO)
;
VIDEO:
PUSH HL ;[009A]
LD HL,(SYSVAR_BPERL) ;[009B] 32 bytes per line (usually)
BIT 6,L ;[009E] Is double height?
POP HL ;[00A0]
JP Z,VIDEO_GETPOS ;[00A1] If NOT double height chars.
PUSH AF ;[00A4]
CALL VIDEO_GETPOS ;[00A5]
LD A,$20 ;[00A8]
CALL VIDEO_WBANKS ;[00AA]
POP AF ;[00AD]
PUSH AF ;[00AE]
CALL VIDEO_GETPOS ;[00AF]
XOR A ;[00B2]
CALL VIDEO_WBANKS ;[00B3]
POP AF ;[00B6]
RET ;[00B7]
VIDEO_WBANKS:
LD (SYSVAR_BLUBNK),A ;[00B8] &8000
LD (SYSVAR_REDBNK),A ;[00BB] &C000
LD (SYSVAR_GRNBNK),A ;[00BE] &C000
RET ;[00C1]
VIDEO_GETPOS:
PUSH AF ;[00C2]
PUSH HL ;[00C3]
PUSH DE ;[00C4]
PUSH BC ;[00C5]
CALL VIDEO_POS ;[00C6]
POP BC ;[00C9]
POP DE ;[00CA]
POP HL ;[00CB]
POP AF ;[00CC]
RET ;[00CD]
;
; Takes character in A and gives the address (in HL) of the character bitmap,
; within the alphanumeric or graphic character bitmap tables.
; (called from VIDEO_POS, and LETTER function)
;
FONT:
LD HL,(SYSVAR_CHRTBL) ;[00CE]
BIT 7,A ;[00D1]
JR Z,FONT_OFFSET ;[00D3] < 128 ? Alpha chars
LD HL,(SYSVAR_GPHTBL) ;[00D5] > 127 ? Graphic chars
FONT_OFFSET:
AND $7F ;[00D8]
PUSH HL ;[00DA]
LD L,A ;[00DB] Let HL=char no.
LD H,$00 ;[00DC]
ADD HL,HL ;[00DE] Shift left
LD E,L ;[00DF] Let DE=HL
LD D,H ;[00E0]
ADD HL,HL ;[00E1] Shift left
ADD HL,HL ;[00E2] Shift left
ADD HL,DE ;[00E3] Let HL=HL+DE
POP DE ;[00E4] Let DE = CHR/GPHTBL
ADD HL,DE ;[00E5] Let HL = CHRTBL+HL (offset)
RET ;[00E6]
;
; Get bitmap and physical address/location for a character on screen
; (called from VIDEO-->VIDEO_GETPOS)
;
VIDEO_POS:
CALL FONT ;[00E7]
EX DE,HL ;[00EA] Let DE = font TBL offset
LD HL,(SYSVAR_CURSORY) ;[00EB]
LD H,$00 ;[00EE]
LD A,(SYSVAR_BPERL) ;[00F0]
SRL A ;[00F3]
VIDEO_YPOS:
ADD HL,HL ;[00F5] Deduce Y-Pos and handle double-height.
SRL A ;[00F6]
JR NZ,VIDEO_YPOS ;[00F8]
VIDEO_XPOS:
LD A,(SYSVAR_CURSORX) ;[00FA]
RRCA ;[00FD]
RRCA ;[00FE]
AND $3F ;[00FF]
LD C,A ;[0101]
LD B,$00 ;[0102]
ADD HL,BC ;[0104]
LD A,(SYSVAR_CURSORX) ;[0105]
AND $03 ;[0108]
JR Z,JP_VID1 ;[010A] Choose one of three xpos1/2/3 routines based on X pos.
DEC A ;[010C]
JR Z,JP_VID2 ;[010D]
DEC A ;[010F]
JR Z,VID3 ;[0110]
JR CALL_XPOS4 ;[0112]
JP_VID2:
JP VIDEO_XPOS2 ;[0114]
JP_VID1:
JP VIDEO_XPOS1 ;[0117]
CALL_XPOS4:
PUSH HL ;[011A]
PUSH DE ;[011B]
CALL VIDEO_XPOS4 ;[011C]
POP DE ;[011F]
POP HL ;[0120]
INC HL ;[0121]
JP VIDEO_XPOS4B ;[0122]
VID3:
PUSH HL ;[0125]
PUSH DE ;[0126]
CALL VIDEO_XPOS3 ;[0127]
POP DE ;[012A]
POP HL ;[012B]
INC HL ;[012C]
JP VIDEO_XPOS3B ;[012D]
;
; First of four screen position routines (see Nilug 1) <DISPLAY.MAC: VID1>
;
VIDEO_XPOS1:
LD B,$0A ;[0130]
VIDEO_XPOS1A:
PUSH BC ;[0132]
LD A,(SYSVAR_MASK) ;[0133]
OR $03 ;[0136]
LD C,A ;[0138]
LD A,(DE) ;[0139]
RLCA ;[013A]
RLCA ;[013B]
AND $FC ;[013C]
CALL SYSVAR_OUTB ;[013E]
LD BC,(SYSVAR_BPERL) ;[0141]
ADD HL,BC ;[0145]
INC DE ;[0146]
POP BC ;[0147]
DJNZ VIDEO_XPOS1A ;[0148]
RET ;[014A]
;
; Second of four screen position routines (see Nilug 1) <DISPLAY.MAC: VID2>
;
VIDEO_XPOS2:
LD B,$0A ;[014B]
VIDEO_XPOS2A:
PUSH BC ;[014D]
LD A,(SYSVAR_MASK) ;[014E]
OR $C0 ;[0151]
LD C,A ;[0153]
LD A,(DE) ;[0154]
AND $3F ;[0155]
CALL SYSVAR_OUTB ;[0157]
LD BC,(SYSVAR_BPERL) ;[015A]
ADD HL,BC ;[015E]
INC DE ;[015F]
POP BC ;[0160]
DJNZ VIDEO_XPOS2A ;[0161]
RET ;[0163]
VIDEO_XPOS4B:
LD B,$0A ;[0164]
VIDEO_XPOS4C:
PUSH BC ;[0166]
LD A,(SYSVAR_MASK) ;[0167]
OR $0F ;[016A]
LD C,A ;[016C]
LD A,(DE) ;[016D]
RLCA ;[016E]
RLCA ;[016F]
RLCA ;[0170]
RLCA ;[0171]
AND $F0 ;[0172]
CALL SYSVAR_OUTB ;[0174]
LD BC,(SYSVAR_BPERL) ;[0177]
ADD HL,BC ;[017B]
INC DE ;[017C]
POP BC ;[017D]
DJNZ VIDEO_XPOS4C ;[017E]
RET ;[0180]
;
; Fourth of four screen position routines (see Nilug 1)
;
VIDEO_XPOS4:
LD B,$0A ;[0181]
VIDEO_XPOS4A:
PUSH BC ;[0183]
LD A,(SYSVAR_MASK) ;[0184]
OR $FC ;[0187]
LD C,A ;[0189]
LD A,(DE) ;[018A]
RLCA ;[018B]
RLCA ;[018C]
RLCA ;[018D]
RLCA ;[018E]
AND $03 ;[018F]
CALL SYSVAR_OUTB ;[0191]
LD BC,(SYSVAR_BPERL) ;[0194]
ADD HL,BC ;[0198]
INC DE ;[0199]
POP BC ;[019A]
DJNZ VIDEO_XPOS4A ;[019B]
RET ;[019D]
VIDEO_XPOS3B:
LD B,$0A ;[019E]
XX4:
PUSH BC ;[01A0]
LD A,(SYSVAR_MASK) ;[01A1]
OR $3F ;[01A4]
LD C,A ;[01A6]
LD A,(DE) ;[01A7]
RRCA ;[01A8]
RRCA ;[01A9]
AND $C0 ;[01AA]
CALL SYSVAR_OUTB ;[01AC]
LD BC,(SYSVAR_BPERL) ;[01AF]
ADD HL,BC ;[01B3]
INC DE ;[01B4]
POP BC ;[01B5]
DJNZ XX4 ;[01B6]
RET ;[01B8]
;
; Third of four screen position routines (see Nilug 1)
;
VIDEO_XPOS3:
LD B,$0A ;[01B9]
VIDEO_XPOS3A:
PUSH BC ;[01BB]
LD A,(SYSVAR_MASK) ;[01BC]
OR $F0 ;[01BF]
LD C,A ;[01C1]
LD A,(DE) ;[01C2]
RRCA ;[01C3]
RRCA ;[01C4]
AND $0F ;[01C5]
CALL SYSVAR_OUTB ;[01C7]
LD BC,(SYSVAR_BPERL) ;[01CA]
ADD HL,BC ;[01CE]
INC DE ;[01CF]
POP BC ;[01D0]
DJNZ VIDEO_XPOS3A ;[01D1]
RET ;[01D3]
;
; Define bit patterns for characters on Lynx screen.
; Each is 6 dots across by 10 dots down.
;
CHRTBS:
DB $00,$00,$00,$00,$00,$00,$00,$00,$00,$00 ;[01D4]
DB $00,$08,$08,$08,$08,$08,$00,$08,$00,$00 ;[01DE] !
DB $00,$0A,$0A,$00,$00,$00,$00,$00,$00,$00 ;[01E8] "
DB $00,$0A,$0A,$1F,$0A,$1F,$0A,$0A,$00,$00 ;[01F2] sharp
DB $00,$04,$0E,$14,$0E,$05,$15,$0E,$04,$00 ;[01FC] $
DB $00,$00,$18,$19,$02,$04,$08,$13,$03,$00 ;[0206] %
DB $00,$08,$14,$14,$08,$15,$12,$0D,$00,$00 ;[0210] &
DB $00,$0C,$04,$08,$00,$00,$00,$00,$00,$00 ;[021A] '
DB $00,$02,$04,$04,$04,$04,$04,$02,$00,$00 ;[0224] (
DB $00,$10,$08,$08,$08,$08,$08,$10,$00,$00 ;[022E] )
DB $00,$00,$00,$0A,$04,$1F,$04,$0A,$00,$00 ;[0238] *
DB $00,$00,$00,$04,$04,$1F,$04,$04,$00,$00 ;[0242] +
DB $00,$00,$00,$00,$00,$00,$18,$08,$10,$00 ;[024C] ,
DB $00,$00,$00,$00,$00,$1F,$00,$00,$00,$00 ;[0256] -
DB $00,$00,$00,$00,$00,$00,$0C,$0C,$00,$00 ;[0260] .
DB $00,$00,$01,$02,$04,$08,$10,$00,$00,$00 ;[026A] /
DB $00,$0E,$11,$13,$15,$19,$11,$0E,$00,$00 ;[0274] 0
DB $00,$04,$0C,$04,$04,$04,$04,$0E,$00,$00 ;[027E] 1
DB $00,$0E,$11,$01,$0E,$10,$10,$1F,$00,$00 ;[0288] 2
DB $00,$0E,$11,$01,$06,$01,$11,$0E,$00,$00 ;[0292] 3
DB $00,$10,$10,$12,$12,$1F,$02,$02,$00,$00 ;[029C] 4
DB $00,$1F,$10,$1E,$01,$01,$11,$0E,$00,$00 ;[02A6] 5
DB $00,$06,$08,$10,$1E,$11,$11,$0E,$00,$00 ;[02B0] 6
DB $00,$1F,$01,$02,$04,$08,$08,$08,$00,$00 ;[02BA] 7
DB $00,$0E,$11,$11,$0E,$11,$11,$0E,$00,$00 ;[02C4] 8
DB $00,$0E,$11,$11,$0F,$01,$02,$0C,$00,$00 ;[02CE] 9
DB $00,$00,$00,$18,$18,$00,$18,$18,$00,$00 ;[02D8] :
DB $00,$00,$00,$18,$18,$00,$18,$08,$10,$00 ;[02E2] ;
DB $00,$00,$00,$04,$08,$10,$08,$04,$00,$00 ;[02EC] <
DB $00,$00,$00,$00,$1E,$00,$1E,$00,$00,$00 ;[02F6] =
DB $00,$00,$00,$10,$08,$04,$08,$10,$00,$00 ;[0300] >
DB $00,$0E,$11,$01,$06,$04,$00,$04,$00,$00 ;[030A] ?
DB $00,$0E,$13,$15,$15,$16,$10,$0E,$00,$00 ;[0314] @
DB $00,$04,$0A,$11,$11,$1F,$11,$11,$00,$00 ;[031E] A
DB $00,$1E,$11,$1E,$11,$11,$11,$1E,$00,$00 ;[0328] B
DB $00,$0E,$11,$10,$10,$10,$11,$0E,$00,$00 ;[0332] C
DB $00,$1C,$12,$11,$11,$11,$11,$1E,$00,$00 ;[033C] D
DB $00,$1F,$10,$1E,$10,$10,$10,$1F,$00,$00 ;[0346] E
DB $00,$1F,$10,$1E,$10,$10,$10,$10,$00,$00 ;[0350] F
DB $00,$0E,$11,$10,$17,$11,$11,$0F,$00,$00 ;[035A] G
DB $00,$11,$11,$1F,$11,$11,$11,$11,$00,$00 ;[0364] H
DB $00,$0E,$04,$04,$04,$04,$04,$0E,$00,$00 ;[036E] I
DB $00,$0F,$02,$02,$02,$02,$12,$0C,$00,$00 ;[0378] J
DB $00,$11,$12,$14,$18,$14,$12,$11,$00,$00 ;[0382] K
DB $00,$10,$10,$10,$10,$10,$10,$1F,$00,$00 ;[038C] L
DB $00,$11,$1B,$15,$11,$11,$11,$11,$00,$00 ;[0396] M
DB $00,$11,$19,$15,$13,$11,$11,$11,$00,$00 ;[03A0] N
DB $00,$0E,$11,$11,$11,$11,$11,$0E,$00,$00 ;[03AA] O
DB $00,$1E,$11,$11,$1E,$10,$10,$10,$00,$00 ;[03B4] P
DB $00,$0E,$11,$11,$11,$15,$12,$0D,$00,$00 ;[03BE] Q
DB $00,$1E,$11,$11,$1E,$14,$12,$11,$00,$00 ;[03C8] R
DB $00,$0E,$11,$10,$0E,$01,$11,$0E,$00,$00 ;[03D2] S
DB $00,$1F,$04,$04,$04,$04,$04,$04,$00,$00 ;[03DC] T
DB $00,$11,$11,$11,$11,$11,$13,$0D,$00,$00 ;[03E6] U
DB $00,$11,$11,$11,$11,$11,$0A,$04,$00,$00 ;[03F0] V
DB $00,$11,$11,$11,$11,$15,$1B,$11,$00,$00 ;[03FA] W
DB $00,$11,$11,$0A,$04,$0A,$11,$11,$00,$00 ;[0404] X
DB $00,$11,$11,$0A,$04,$04,$04,$04,$00,$00 ;[040E] Y
DB $00,$1F,$01,$02,$04,$08,$10,$1F,$00,$00 ;[0418] Z
DB $00,$0E,$08,$08,$08,$08,$08,$0E,$00,$00 ;[0422] [
DB $00,$00,$10,$08,$04,$02,$01,$00,$00,$00 ;[042C] \
DB $00,$1C,$04,$04,$04,$04,$04,$1C,$00,$00 ;[0436] ]
DB $00,$03,$04,$09,$0A,$0A,$09,$04,$03,$00 ;[0440] ^
DB $00,$00,$00,$00,$00,$00,$00,$00,$00,$3F ;[044A] _
DB $00,$06,$09,$08,$1E,$08,$08,$0F,$00,$00 ;[0454] `
DB $00,$00,$00,$0D,$13,$11,$11,$0F,$00,$00 ;[045E] a
DB $00,$10,$10,$16,$19,$11,$11,$1E,$00,$00 ;[0468] b
DB $00,$00,$00,$0E,$10,$10,$10,$0E,$00,$00 ;[0472] c
DB $00,$01,$01,$0D,$13,$11,$11,$0F,$00,$00 ;[047C] d
DB $00,$00,$00,$0E,$11,$1F,$10,$0E,$00,$00 ;[0486] e
DB $00,$06,$09,$08,$1E,$08,$08,$08,$00,$00 ;[0490] f
DB $00,$00,$00,$0D,$13,$11,$11,$0F,$01,$0E ;[049A] g
DB $00,$10,$10,$16,$19,$11,$11,$11,$00,$00 ;[04A4] h
DB $00,$00,$04,$00,$04,$04,$04,$04,$00,$00 ;[04AE] i
DB $00,$00,$02,$00,$02,$02,$02,$02,$12,$0C ;[04B8] j
DB $00,$10,$10,$12,$14,$1C,$12,$11,$00,$00 ;[04C2] k
DB $00,$08,$08,$08,$08,$08,$08,$06,$00,$00 ;[04CC] l
DB $00,$00,$00,$1A,$15,$15,$15,$15,$00,$00 ;[04D6] m
DB $00,$00,$00,$16,$19,$11,$11,$11,$00,$00 ;[04E0] n
DB $00,$00,$00,$0E,$11,$11,$11,$0E,$00,$00 ;[04EA] o
DB $00,$00,$00,$16,$19,$11,$11,$1E,$10,$10 ;[04F4] p
DB $00,$00,$00,$0D,$13,$11,$11,$0F,$01,$01 ;[04FE] q
DB $00,$00,$00,$16,$19,$10,$10,$10,$00,$00 ;[0508] r
DB $00,$00,$00,$0E,$10,$0E,$01,$0E,$00,$00 ;[0512] s
DB $00,$00,$08,$1F,$08,$08,$09,$06,$00,$00 ;[051C] t
DB $00,$00,$00,$11,$11,$11,$13,$0D,$00,$00 ;[0526] u
DB $00,$00,$00,$11,$11,$11,$0A,$04,$00,$00 ;[0530] v
DB $00,$00,$00,$11,$11,$15,$1B,$11,$00,$00 ;[053A] w
DB $00,$00,$00,$11,$0A,$04,$0A,$11,$00,$00 ;[0544] x
DB $00,$00,$00,$11,$11,$11,$11,$0F,$01,$0E ;[054E] y
DB $00,$00,$00,$1F,$02,$04,$08,$1F,$00,$00 ;[0558] z
DB $00,$00,$00,$04,$02,$1F,$02,$04,$00,$00 ;[0562] {
DB $00,$00,$00,$04,$08,$1F,$08,$04,$00,$00 ;[056C] |
DB $00,$00,$00,$04,$0E,$15,$04,$04,$00,$00 ;[0576] }
DB $00,$00,$00,$04,$04,$15,$0E,$04,$00,$00 ;[0580] ~
DB $00,$30,$08,$24,$04,$04,$24,$08,$30,$00 ;[058A] delete
;
; Graphic characters - blocks & stripes
;
DB $00,$00,$00,$00,$00,$00,$00,$00,$00,$00 ;[0594] E0h
DB $38,$38,$38,$38,$38,$00,$00,$00,$00,$00 ;[059E] E1h
DB $07,$07,$07,$07,$07,$00,$00,$00,$00,$00 ;[05A8] E2h
DB $3F,$3F,$3F,$3F,$3F,$00,$00,$00,$00,$00 ;[05B2] E3h
DB $00,$00,$00,$00,$00,$38,$38,$38,$38,$38 ;[05BC] E4h
DB $38,$38,$38,$38,$38,$38,$38,$38,$38,$38 ;[05C6] E5h
DB $07,$07,$07,$07,$07,$38,$38,$38,$38,$38 ;[05D0] E6h
DB $3F,$3F,$3F,$3F,$3F,$38,$38,$38,$38,$38 ;[05DA] E7h
DB $00,$00,$00,$00,$00,$07,$07,$07,$07,$07 ;[05E4] E8h
DB $38,$38,$38,$38,$38,$07,$07,$07,$07,$07 ;[05EE] E9h
DB $07,$07,$07,$07,$07,$07,$07,$07,$07,$07 ;[05F8] EAh
DB $3F,$3F,$3F,$3F,$3F,$07,$07,$07,$07,$07 ;[0602] EBh
DB $00,$00,$00,$00,$00,$3F,$3F,$3F,$3F,$3F ;[060C] ECh
DB $38,$38,$38,$38,$38,$3F,$3F,$3F,$3F,$3F ;[0616] EDh
DB $07,$07,$07,$07,$07,$3F,$3F,$3F,$3F,$3F ;[0620] EEh
DB $3F,$3F,$3F,$3F,$3F,$3F,$3F,$3F,$3F,$3F ;[062A] EFh
DB $2A,$2A,$2A,$2A,$2A,$2A,$2A,$2A,$2A,$2A ;[0634] F0H
DB $3F,$00,$3F,$00,$3F,$00,$3F,$00,$3F,$00 ;[063E] F1h
DB $2A,$15,$2A,$15,$2A,$15,$2A,$15,$2A,$15 ;[0648] F2h
;
; Lynx logo built out of 7 characters
;
DB $1E,$08,$08,$08,$08,$08,$08,$1F,$00,$00 ;[0652] F3h
DB $3B,$11,$0A,$04,$04,$24,$24,$2E,$00,$00 ;[065C] F4h
DB $38,$0C,$0A,$09,$08,$08,$08,$1C,$00,$00 ;[0666] F5h
DB $3F,$12,$11,$10,$30,$11,$12,$17,$00,$00 ;[0670] F6h
DB $1C,$08,$10,$20,$20,$10,$08,$1C,$00,$00 ;[067A] F7h
DB $03,$1B,$18,$00,$37,$37,$07,$07,$00,$00 ;[0684] F8h
DB $00,$00,$18,$18,$00,$00,$00,$00,$00,$00 ;[068E] F9h
;
; Set ink and paper. (VDU 1/2 with argument in A.)
;
SETINK:
LD (SYSVAR_INKST),A ;[0698]
INKPAPER_EXIT:
LD (HL),$00 ;[069B]
JR SCREEN_END ;[069D]
;
; Set paper colour.
;
SETPAPER:
LD (SYSVAR_PAPST),A ;[069F]
JR INKPAPER_EXIT ;[06A2]
;
; Display Driver <DISPLAY.MAC:D$SCRN>
;
SCREEN:
PUSH AF ;[06A4]
PUSH HL ;[06A5]
PUSH DE ;[06A6]
PUSH BC ;[06A7]
LD HL,SYSVAR_LASTDSP ;[06A8]
DEC (HL) ;[06AB]
JR Z,SETINK ;[06AC]
DEC (HL) ;[06AE]
JR Z,SETPAPER ;[06AF]
LD (HL),A ;[06B1]
CP $20 ;[06B2]
JR C,OUTB_OR_VDU ;[06B4]
CALL SYSVAR_VIDEO ;[06B6]
CALL ADV_CURSOR ;[06B9]
LD (SYSVAR_CURSORX),DE ;[06BC]
SCREEN2:
LD A,(SYSVAR_CURSTAT) ;[06C0]
OR A ;[06C3]
LD A,CURCHR ;[06C4]
CALL NZ,SYSVAR_VIDEO ;[06C6]
SCREEN_END:
POP BC ;[06C9]
POP DE ;[06CA]
POP HL ;[06CB]
POP AF ;[06CC]
NULL:
RET ;[06CD]
;
; Special/normal character routine
;
OUTB_OR_VDU:
PUSH AF ;[06CE]
LD A,(SYSVAR_CURSTAT) ;[06CF]
OR A ;[06D2]
LD A,' ' ;[06D3]
CALL NZ,SYSVAR_VIDEO ;[06D5] Outputs character in A to current cursor position.
POP AF ;[06D8]
LD HL,SCREEN2 ;[06D9]
PUSH HL ;[06DC] Return address.
LD HL,SCREEN_TBL ;[06DD]
RLCA ;[06E0]
LD E,A ;[06E1]
LD D,$00 ;[06E2]
ADD HL,DE ;[06E4]
LD A,(HL) ;[06E5]
INC HL ;[06E6]
LD H,(HL) ;[06E7]
LD L,A ;[06E8]
JP (HL) ;[06E9]
;
; List of ROM addresses for the VDU routines. (VDU 0-31)
;
SCREEN_TBL:
DW NULL ;[06EA]
DW NULL ;[06EC] 1
DW NULL ;[06EE] 2
DW NULL ;[06F0] 3
DW SCREEN_CLEAR ;[06F2] 4
DW SCREEN_UP_ONE ;[06F4] 5
DW SCREEN_DOWN_ONE ;[06F6] 6
DW SCREEN_BELL ;[06F8] 7
DW SCREEN_BACKSPACE ;[06FA] 8
DW SCREEN_TAB ;[06FC] 9
DW SCREEN_LF ;[06FE] 10
DW NULL ;[0700] 11
DW PATCH1 ;[0702] 12
DW SCREEN_CRLF ;[0704] 13
DW SCREEN_CURS_ON ;[0706] 14
DW SCREEN_CURS_OFF ;[0708] 15
DW SCREEN_TOP ;[070A] 16
DW NULL ;[070C] 17
DW SCREEN_INVERT ;[070E] 18
DW SCREEN_BEGIN ;[0710] 19
DW SCREEN_MASK ;[0712] 20
DW SCREEN_MASK+$02 ;[0714] 21
DW SCREEN_BACK_CURS ;[0716] 22
DW SCREEN_HOME ;[0718] 23
DW SCREEN_DOUBLE_ON ;[071A] 24
DW SCREEN_DOUBLE_OFF ;[071C] 25
DW NULL ;[071E] 26
DW NULL ;[0720] 27
DW SCREEN_HA_LF_UP ;[0722] 28
DW SCREEN_HA_LF ;[0724] 29
DW SCREEN_CLEAR_EOL ;[0726] 30
DW SCREEN_CRLF ;[0728] 31
;
; Turns double height characters on (VDU 24)
;
SCREEN_DOUBLE_ON:
LD A,$40 ;[072A]
SCREEN_SET_BPERL:
LD (SYSVAR_BPERL),A ;[072C] I guess it's 64 because 32 cols but printed twice when double height?
RET ;[072F]
;
; Turns double height characters off (VDU 25)
;
SCREEN_DOUBLE_OFF:
LD A,$20 ;[0730]
JR SCREEN_SET_BPERL ;[0732]
;
; Overwrite on (VDU 21)
;
SCREEN_MASK:
XOR A ;[0734]
LD BC,$FF3E ;[0735] (nb. SCREEN_MASK+$02: LD A,$FF)
LD (SYSVAR_MASK),A ;[0738]
RET ;[073B]
;
; Swaps ink and paper (VDU 18)
;
SCREEN_INVERT:
LD HL,(SYSVAR_INKST) ;[073C]
LD A,L ;[073F]
LD L,H ;[0740]
LD H,A ;[0741]
LD (SYSVAR_INKST),HL ;[0742]
RET ;[0745]
;
; Move cursor over 1 character (to the right)
;
ADV_CURSOR:
LD HL,(SYSVAR_WINDST) ;[0746]
LD DE,(SYSVAR_CURSORX) ;[0749]
LD A,E ;[074D]
ADD A,$03 ;[074E]
LD E,A ;[0750]
CP H ;[0751]
RET C ;[0752]
LD E,L ;[0753]
ADV_CURSOR1:
LD HL,(SYSVAR_WINDST+$02) ;[0754] Window height.
LD A,D ;[0757]
CALL SYSVAR_SLFRAM ;[0758] Unused.
ADD A,$0A ;[075B] Add 10 pixels
ADV_CURSOR2:
LD D,A ;[075D]
CP H ;[075E]
RET C ;[075F]
LD D,L ;[0760]
RET ;[0761]
;
; Clears screen and homes cursor (VDU 4)
;
SCREEN_CLEAR:
CALL _CLS ;[0762]
;
; Homes cursor (takes cursor inside of window) (VDU 23)
;
SCREEN_HOME:
CALL SCREEN_CR ;[0765]
;
; Moves cursor to top of screen (VDU 16)
;
SCREEN_TOP:
LD A,(SYSVAR_WINDST+$02) ;[0768]
LD (SYSVAR_CURSORY),A ;[076B]
RET ;[076E]
;
; Carriage return, linefeed, if cursor is not at beginning of line (VDU 19)
;
SCREEN_BEGIN:
LD HL,(SYSVAR_WINDST) ;[076F]
LD A,(SYSVAR_CURSORX) ;[0772]
CP L ;[0775]
RET Z ;[0776]
LD A,$0D ;[0777]
RST $08 ;[0779]
RET ;[077A]
;
; Carriage return, linefeed, clears to end of line (VDU 13/31)
;
SCREEN_CRLF:
CALL SCREEN_CR ;[077B]
;
; Line feed (moves cursor down 10 pixel lines) (VDU 10)
;
SCREEN_LF:
LD DE,(SYSVAR_CURSORX) ;[077E]
CALL ADV_CURSOR1 ;[0782]
JR SAVE_CURSORX ;[0785]
;
; Moves cursor down one pixel (VDU 6)
;
SCREEN_DOWN_ONE:
LD C,$01 ;[0787]
JR SCREEN_HA_LF1 ;[0789]
;
; Moves cursor down 3 pixels (VDU 29) (Half linefeed)
;
SCREEN_HA_LF:
LD C,$03 ;[078B]
SCREEN_HA_LF1:
LD DE,(SYSVAR_CURSORX) ;[078D]
LD HL,(SYSVAR_WINDST+$02) ;[0791]
LD A,D ;[0794]
ADD A,C ;[0795]
CALL ADV_CURSOR2 ;[0796]
JR SAVE_CURSORX ;[0799]
;
; Move cursor to the leftmost column of the WINDOW.
;
SCREEN_CR:
LD A,(SYSVAR_WINDST) ;[079B]
LD (SYSVAR_CURSORX),A ;[079E]
RET ;[07A1]
;
; Tabs cursor to next field (VDU 9)
;
SCREEN_TAB:
LD A,(SYSVAR_CURSORX) ;[07A2]
INC A ;[07A5]
LD HL,TBLE1-1 ;[07A6]
SCREEN_TAB1:
INC HL ;[07A9]
CP (HL) ;[07AA]
JR NC,SCREEN_TAB1 ;[07AB]
LD H,(HL) ;[07AD]
INC H ;[07AE]
JR Z,SCREEN_CRLF ;[07AF]
DEC H ;[07B1]
SCREEN_TAB12:
LD A,' ' ;[07B2] Print spaces
RST $08 ;[07B4]
LD A,(SYSVAR_CURSORX) ;[07B5]
CP H ;[07B8]
RET NC ;[07B9]
JR SCREEN_TAB12 ;[07BA]
;
; TAB table
;
TBLE1:
DB 27,51,75,99,255 ;[07BC]
;
; Clears to end of line (VDU 30)
;
SCREEN_CLEAR_EOL:
LD A,(SYSVAR_WINDST+$01) ;[07C1]
DEC A ;[07C4]
LD HL,(SYSVAR_CURSORX) ;[07C5]
PUSH HL ;[07C8]
SCREEN_CLEAR_EOL_LOOP:
LD (SYSVAR_CURSORX),HL ;[07C9]
PUSH HL ;[07CC]
PUSH AF ;[07CD]
LD A,$20 ;[07CE]
CALL SYSVAR_VIDEO ;[07D0]
POP AF ;[07D3]
POP HL ;[07D4]
INC L ;[07D5]
INC L ;[07D6]
INC L ;[07D7]
CP L ;[07D8]
JR NC,SCREEN_CLEAR_EOL_LOOP ;[07D9]
POP DE ;[07DB]
JR SAVE_CURSORX ;[07DC]
;
; Backspace cursor (VDU 22)
;
SCREEN_BACK_CURS:
CALL SUB_BACKSPACE ;[07DE]
SAVE_CURSORX:
LD (SYSVAR_CURSORX),DE ;[07E1]
RET ;[07E5]
;
; Called by backspace routine.
;
SUB_BACKSPACE:
LD HL,(SYSVAR_WINDST) ;[07E6]
LD DE,(SYSVAR_CURSORX) ;[07E9]
DEC L ;[07ED]
LD B,$03 ;[07EE]
SUB_BACKSPACE1:
DEC E ;[07F0]
LD A,E ;[07F1]
CP L ;[07F2]
JR Z,SUB_BACKSPACE2 ;[07F3]
DJNZ SUB_BACKSPACE1 ;[07F5]
RET ;[07F7]
SUB_BACKSPACE2:
LD E,H ;[07F8]
DEC E ;[07F9]
DEC E ;[07FA]
DEC E ;[07FB]
LD HL,(SYSVAR_WINDST+$02) ;[07FC]
LD A,D ;[07FF]
SUB $0A ;[0800]
SUB_BACKSPACE3:
LD D,A ;[0802]
SUB L ;[0803]
CP $F6 ;[0804]
RET C ;[0806]
LD A,H ;[0807]
SUB $0A ;[0808]
LD D,A ;[080A]
RET ;[080B]
;
; Moves cursor up one pixel (VDU 5)
;
SCREEN_UP_ONE:
LD C,$01 ;[080C]
JR SCREEN_HA_LF_UP1 ;[080E]
;
; Moves cursor up 3 pixels (VDU 28)
;
SCREEN_HA_LF_UP:
LD C,$03 ;[0810]
SCREEN_HA_LF_UP1:
LD DE,(SYSVAR_CURSORX) ;[0812]
LD HL,(SYSVAR_WINDST+$02) ;[0816]
LD A,D ;[0819]
SUB C ;[081A]
CALL SUB_BACKSPACE3 ;[081B]
JR SAVE_CURSORX ;[081E]
;
; Backspace and erase character (VDU 8)
;
SCREEN_BACKSPACE:
CALL SCREEN_BACK_CURS ;[0820]
LD A,$20 ;[0823]
JP SYSVAR_VIDEO ;[0825]
;
; Turns cursor on (VDU 14)
;
SCREEN_CURS_ON:
LD A,$01 ;[0828]
GET_CURSTAT:
LD (SYSVAR_CURSTAT),A ;[082A]
RET ;[082D]
;
; Turns cursor off (VDU 15)
;
SCREEN_CURS_OFF:
XOR A ;[082E]
JR GET_CURSTAT ;[082F]
;
; WINDOW routine.
;
EWINDOW:
LD B,$04 ;[0831]
LD HL,SYSVAR_WINDST ;[0833]
EWINDOW1:
PUSH HL ;[0836]