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desolcoda.asm
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;----------------------------------------------------------------------------
; Turn on/off cheat codes
CHEAT_SHOW_ROOM_NUMBER EQU 0
CHEAT_ALL_ACCESS EQU 0
CHEAT_ALL_INVENTORY EQU 0
CHEAT_HAVE_WEAPON EQU 0
CHEAT_HEALTH_999 EQU 0
;----------------------------------------------------------------------------
; Korvet consts
INTRREG EQU 0FF28h
INTRREGMSK EQU 0FF29h
INTRREGVAL EQU 18 ; 00010110
ODOSA EQU 1CH
DOSG1 EQU 3CH
;----------------------------------------------------------------------------
ORG $0200
DesolateCodeBeg:
Start:
; ld sp,$B2E0
; ld sp,MirrorTab
ld de,MirrorTab
GenMirrorTab:
ld h,e
add hl,hl
rra ; 0
add hl,hl
rra ; 1
add hl,hl
rra ; 2
add hl,hl
rra ; 3
add hl,hl
rra ; 4
add hl,hl
rra ; 5
add hl,hl
rra ; 6
add hl,hl
rra ; 7
ld (de),a
inc e
jp nz,GenMirrorTab
; Setup interrupts
; ld a, INTRREGVAL + (low INTRTAB & ~31) ; control code + hi 3 bits of low address byte
; ld (INTRREG),a
; ld a,high INTRTAB
; ld (INTRREGMSK),a
; ld a,0C3h ; jmp
; ld (INTRTAB + 4*4),a ; write instruction code
; ld hl,INT_SCREEN ; interrupt routine handler
; ld (INTRTAB + 4*4 + 1),hl ; write interrupt routine address
; ld a,~16 ; disable all interrupts but 4-th
; ld (INTRREGMSK),a
; ei
;
; Draw DESOLATE title sign on top of the screen
; LDBF5 buffer already pre-filled with 3 lines of the title screen with the big DESOLATE sign
LD HL,LDBF5
call LB177 ; Display screen from tiles with Tileset2
call CopyTitleSign
call ClearShadowScreen
call LBA07 ; Show titles and go to Menu
; Cheat code to get all door access codes
IF CHEAT_ALL_ACCESS = 1
LD HL,LDCA2
LD B,$48
start_1:
LD (HL),$01
INC HL
dec b
jp NZ,start_1
ENDIF
; Cheat code to have all inventory items
IF CHEAT_ALL_INVENTORY = 1
LD HL,LDB9C
LD B,26
start_2:
LD (HL),$01
INC HL
dec b
jp NZ,start_2
ENDIF
; Cheat code to have the weapon
IF CHEAT_HAVE_WEAPON = 1
ld a,$01
ld (LDCF7),a
ENDIF
IF CHEAT_HEALTH_999 = 1
ld hl,999
ld (LDB7A),hl
ENDIF
; call LB0A2 ; Inventory
; call LBBEC ; Info menu item, show Controls
; call LBADE ; New game
; call LBB7E ; Game start
; call LB9A2 ; Player is dead
; call LBD85 ; Final
; call LBF6F ; The End
; call ShowShadowScreen
; di
; halt
; call WaitAnyKey
; call ClearShadowScreen
; call ShowShadowScreen
jp Start
;----------------------------------------------------------------------------
; ORG ($ + 31) & 0FFE0h ; align 32
;INTRTAB:
; DS 32
BorderColor DB 0
;----------------------------------------------------------------------------
; Wait for any key
WaitAnyKey:
call ReadKeyboard
or a
jp nz,WaitAnyKey ; Wait for unpress
WaitAnyKey_1:
call ReadKeyboard
or a
jp z,WaitAnyKey_1 ; Wait for press
ret
; Wait until no key pressed - to put after ReadKeyboard calls to prevent double-reads of the same key
WaitKeyUp:
call ReadKeyboard
or a
jp nz,WaitKeyUp ; Wait for unpress
ret
ReadKeyboard:
; Keyboard scan
ld a,~01h ; KB00
ld (0F400h),a
ld a,(0F401h)
ld (KeyLine0),a
ld a,~02h ; KB01
ld (0F400h),a
ld a,(0F401h)
ld (KeyLine1),a
ld a,~20h ; KB05
ld (0F400h),a
ld a,(0F401h)
ld (KeyLine5),a
ld a,~40h ; KB06
ld (0F400h),a
ld a,(0F401h)
ld (KeyLine6),a
ld a,~80h ; KB06
ld (0F400h),a
ld a,(0F401h)
ld (KeyLine7),a
;
; Returns: A=key code, $00 no key; Z=0 for key, Z=1 for no key
; Key codes: Down=$01, Left=$02, Right=$03, Up=$04, Look/shoot=$05
; Inventory=$06, Escape=$07, Switch look/shoot=$08, Enter=$09, Menu=$0F
;ReadKeyboard:
ld hl,ReadKeyboard_map ; Point HL at the keyboard list
ld b,5 ; number of rows to check
ReadKeyboard_0:
ld e,(hl) ; get address low
inc hl
ld d,(hl) ; get address high
inc hl
ld a,(de) ; get bits for keys
ld c,8 ; number of keys in a row
ReadKeyboard_1:
rra ; shift A left; bit 0 sets carry bit
jp nc,ReadKeyboard_2 ; if the bit is 0, we've found our key
inc hl ; next table address
dec c
jp nz,ReadKeyboard_1 ; continue the loop by bits
dec b
jp nz,ReadKeyboard_0 ; continue the loop by lines
xor a ; clear A, no key found
ret
ReadKeyboard_2:
ld a,(hl) ; We've found a key, fetch the character code
or a
ret
; Mapping: Arrows - movement; Space - look/shoot, Tab - switch look/shoot,
; AR2 - escape, I/M - inventory; P/R - menu, VK=Enter
ReadKeyboard_map:
DW KeyLine0
DB $00,$00,$07,$00,$00,$00,$00,$00 ; \ СТР АР2 F1 F2 F3 F4 F5
DW KeyLine1
DB $08,$00,$09,$00,$02,$04,$03,$01 ; ТАБ ПС ВК ЗБ ← ↑ → ↓
DW KeyLine5
DB $00,$06,$00,$00,$00,$06,$00,$00 ; H I J K L M N O
DW KeyLine6
DB $0F,$00,$0F,$00,$00,$00,$00,$00 ; P Q R S T U V W
DW KeyLine7
DB $00,$00,$00,$00,$00,$00,$00,$05 ; X Y Z [ / ] ^ _
KeyLine0: DB $FF ; 01H \ СТР АР2 F1 F2 F3 F4 F5
KeyLine1: DB $FF ; 02H ТАБ ПС ВК ЗБ ← ↑ → ↓
;KeyLine2: DB $FF ; 04H 0 1 2 3 4 5 6 7
;KeyLine3: DB $FF ; 08H 8 9 * + , - . /
;KeyLine4: DB $FF ; 10H @ A B C D E F G
KeyLine5: DB $FF ; 20H H I J K L M N O
KeyLine6: DB $FF ; 40H P Q R S T U V W
KeyLine7: DB $FF ; 80H X Y Z [ / ] ^ _
;----------------------------------------------------------------------------
; Get shadow screen address using penCol in L86D7
; A = row 0..137
; (L86D7) = penCol 0..191
; Returns HL = address
; Clock timing: (208-228 on v06c)
GetScreenAddr:
push de
ld l,a
ld h,$00 ; now HL = A
add hl,hl ; now HL = A * 2
ld e,l
ld d,h ; now DE = A * 2
add hl,hl ; now HL = A * 4
add hl,de ; now HL = A * 6
add hl,hl ; now HL = A * 12
add hl,hl ; now HL = A * 24
ld de,ShadowScreen
add hl,de
ld a,(L86D7) ; get penCol
rrca
rrca
rrca
and 00011111b
; now A = 8px column
pop de
add a,l
ld l,a ; now HL = line address + column
ret nc
inc h
ret
; Draw tile with mask 16x16 -> 16x16 on shadow screen - for Tileset2 tiles
; A = penRow; L86D7 = penCol; HL = tile address
DrawTileMasked:
ld (SetSP7+1),hl
ex de,hl ; now DE = tile address
ld hl,0
add hl,sp
ld (SetSP8+1),hl
call GetScreenAddr ; now HL = screen addr
ld bc,24-1 ; increment to the next line
; di
SetSP7:
ld sp,0
pop de
ld a,(hl)
and e
or d
ld (hl),a
inc hl
pop de
ld a,(hl)
and e
or d
ld (hl),a
add hl,bc
pop de
ld a,(hl)
and e
or d
ld (hl),a
inc hl
pop de
ld a,(hl)
and e
or d
ld (hl),a
add hl,bc
pop de
ld a,(hl)
and e
or d
ld (hl),a
inc hl
pop de
ld a,(hl)
and e
or d
ld (hl),a
add hl,bc
pop de
ld a,(hl)
and e
or d
ld (hl),a
inc hl
pop de
ld a,(hl)
and e
or d
ld (hl),a
add hl,bc
pop de
ld a,(hl)
and e
or d
ld (hl),a
inc hl
pop de
ld a,(hl)
and e
or d
ld (hl),a
add hl,bc
pop de
ld a,(hl)
and e
or d
ld (hl),a
inc hl
pop de
ld a,(hl)
and e
or d
ld (hl),a
add hl,bc
pop de
ld a,(hl)
and e
or d
ld (hl),a
inc hl
pop de
ld a,(hl)
and e
or d
ld (hl),a
add hl,bc
pop de
ld a,(hl)
and e
or d
ld (hl),a
inc hl
pop de
ld a,(hl)
and e
or d
ld (hl),a
add hl,bc
pop de
ld a,(hl)
and e
or d
ld (hl),a
inc hl
pop de
ld a,(hl)
and e
or d
ld (hl),a
add hl,bc
pop de
ld a,(hl)
and e
or d
ld (hl),a
inc hl
pop de
ld a,(hl)
and e
or d
ld (hl),a
add hl,bc
pop de
ld a,(hl)
and e
or d
ld (hl),a
inc hl
pop de
ld a,(hl)
and e
or d
ld (hl),a
add hl,bc
pop de
ld a,(hl)
and e
or d
ld (hl),a
inc hl
pop de
ld a,(hl)
and e
or d
ld (hl),a
add hl,bc
pop de
ld a,(hl)
and e
or d
ld (hl),a
inc hl
pop de
ld a,(hl)
and e
or d
ld (hl),a
add hl,bc
pop de
ld a,(hl)
and e
or d
ld (hl),a
inc hl
pop de
ld a,(hl)
and e
or d
ld (hl),a
add hl,bc
pop de
ld a,(hl)
and e
or d
ld (hl),a
inc hl
pop de
ld a,(hl)
and e
or d
ld (hl),a
add hl,bc
pop de
ld a,(hl)
and e
or d
ld (hl),a
inc hl
pop de
ld a,(hl)
and e
or d
ld (hl),a
SetSP8:
ld sp,0
; ei
ret
; Draw string on shadow screen using FontProto
; HL = string addr
DrawString:
ld a,(hl)
inc hl
or a
ret z
push hl
call DrawChar
pop hl
jp DrawString
; Draw character on the screen using FontProto
; A = character to show: $00-$1F space with A width; $20 space
DrawChar:
push hl
push bc
cp $20 ; $00-$1F ?
jp c,DrawChar_00 ; yes => set char width and process like space char
jp nz,DrawChar_0 ; not space char => jump
ld a,$03 ; space char gap size
DrawChar_00:
ld (DrawChar_width),a
jp DrawChar_fin
DrawChar_0:
cp $27 ; char less than apostroph?
jp nc,DrawChar_1
add a,$3A ; for '!', quotes, '#' '$' '%' '&'
jp DrawChar_2
DrawChar_1:
cp $2A ; char less than '*'?
jp nc,DrawChar_2
add a,$15 ; for apostroph, '(' ')' chars
DrawChar_2:
sub $2C ; font starts from ','
ld e,a ; calculating the symbol address
ld l,a ;
ld h,$00 ;
ld d,h ;
add hl,hl ; now hl = a * 2
add hl,hl ; now hl = a * 4
add hl,de ; now hl = a * 5
add hl,hl ; now hl = a * 10
add hl,de ; now hl = a * 11
ld de,FontProto
add hl,de ; now hl = addr of the symbol
ex de,hl ; now de=symbol addr
ld a,(L86D8) ; get penRow
ld (DrawChar_row),a
ld a,(de) ; get flag/width byte
inc de
or a ; test for bit 7
; bit 7,a ; lowered symbol?
jp p,DrawChar_3 ; not lowered symbol => skip
ld hl,DrawChar_row
inc (hl) ; start on the next line
DrawChar_3:
and $0f ; keep width 1..8
add a,$02 ; gap 2px after the symbol
ld (DrawChar_width),a
ld a,(DrawChar_row)
call GetScreenAddr
push hl ; store addr on the screen
push de ; store symbol data addr
ld a,(L86D7) ; get penCol
and $07 ; shift 0..7
inc a
ld c,a
ld b,10 ; 10 lines
DrawChar_4: ; loop by lines
push bc ; save counter
ld a,(de)
inc de
DrawChar_5: ; loop for shift
dec c
jp z, DrawChar_6
or a
rra ; shift right
jp DrawChar_5
DrawChar_6:
or (hl)
ld (hl),a ; put on the screen
ld a,(DrawChar_row)
inc a
ld (DrawChar_row),a
call GetScreenAddr
pop bc ; restore counter and shift
dec b
jp nz,DrawChar_4
pop de ; restore symbol data addr
pop hl ; restore addr on the screen
ld a,(L86D7) ; get penCol
and $7 ; shift 0..7
ld b,a
ld a,(DrawChar_width)
add a,b
cp $08 ; shift + width <= 8 ?
jp c,DrawChar_fin ; yes => no need for 2nd pass
; Second pass
ld a,(L86D7) ; get penCol
and $07 ; shift 1..7
ld c,a
ld a,$09
sub c ; a = 9 - shift; result is 2..8
ld c,a
ld a,(DrawChar_row)
add a,-10
ld (DrawChar_row),a
inc hl
ld b,10 ; 10 lines
DrawChar_8: ; loop by lines
push bc ; save counter
ld a,(de)
inc de
DrawChar_9: ; loop for shift
dec c
jp z, DrawChar_A
or a
rla ; shift left
jp DrawChar_9
DrawChar_A:
or (hl)
ld (hl),a ; put on the screen
ld a,(DrawChar_row)
inc a
ld (DrawChar_row),a
call GetScreenAddr
inc hl
pop bc ; restore counter
dec b
jp nz,DrawChar_8
; All done, finalizing
DrawChar_fin:
ld hl,L86D7 ; penCol address
ld a,(DrawChar_width)
add a,(hl)
ld (hl),a ; updating penCol
pop bc
pop hl
ret
DrawChar_width: DB 0 ; Saved symbol width
DrawChar_row0: DB 0 ; Saved first row number
DrawChar_row: DB 0 ; Saved current row number
; Draw decimal number HL in 5 digits
DrawNumber5:
ld bc,-10000
call DrawNumber_1
ld bc,-1000
call DrawNumber_1
; Draw decimal number HL in 3 digits
DrawNumber3:
ld bc,-100
call DrawNumber_1
ld c,-10
call DrawNumber_1
ld c,-1
DrawNumber_1:
ld a,'0'-1
DrawNumber_2:
inc a
ld (DrawNumber_3+1),hl
add hl,bc
jp c,DrawNumber_2
DrawNumber_3:
ld hl,$0000
call DrawChar
ret
;
ScreenThemeNite:
xor a
jp ScreenTheme_0
;
ScreenThemeLite:
ld a,0FFh
ScreenTheme_0:
ld (0FFBFh),a ; set NCREG
ld hl,$C000+56+256*10 ; Orion screen addresses, top-left
ld b,128+16 ; lines count
ld a,0FFh
ScreenTheme_1:
ld c,14 ; number of column pairs, 28 columns
push hl
ScreenTheme_2:
ld (hl),a
inc h
ld (hl),a
inc h
dec c
jp nz,ScreenTheme_2
pop hl
inc l
dec b
jp nz,ScreenTheme_1
ret
; Copy DEDSOLATE title from Main Menu shadow screen to Korvet screen
CopyTitleSign:
ld b,30 ; 30 lines
ld hl,$C000+16+256*12 ; Orion screen addresses, top-left
ld de,ShadowScreen+24*8 ; shadow screen address
jp ShowShadowScreen_0
;
; Copy shadow screen 24*128=3072 bytes to Korvet screen
ShowShadowScreen:
ld b,128 ; 128 lines
ld hl,$C000+64+256*12 ; Orion screen addresses, top-left
ld de,ShadowScreen ; shadow screen address
ShowShadowScreen_0:
; di
ShowShadowScreen_1: ; loop by B
push bc
REPT 23
ld a,(de)
cpl
ld (hl),a
inc de
inc h
ENDM
ld a,(de)
cpl
ld (hl),a
inc de
ld bc,0E901h
add hl,bc
pop bc
dec b ; loop counter for line pairs
jp nz,ShowShadowScreen_1 ; continue the loop
; ei
ret
; Clear block on the shadow screen
; HL=row/col, DE=rows/cols
; columns are 8px wide; rows=1..128, row=0..127; col=0..23, cols=1..24
ClearScreenBlock:
push bc
ld a,l ; column
ld c,h ; row
ld l,h ; row
ld h,$00
ld b,h
add hl,hl ; now HL = row * 2
add hl,bc ; now HL = row * 3
add hl,hl
add hl,hl
add hl,hl ; now HL = row * 24
ld c,a
add hl,bc ; now HL = row * 24 + col
ld bc,ShadowScreen
add hl,bc ; now HL = start address
ld c,24 ; line width in columns
xor a
; ld a,$01 ;DEBUG
ClearScreenBlock_1 ; loop by rows
push hl
ld b,e ; cols
ClearScreenBlock_2: ; loop by columns
ld (hl),a
inc hl
dec b
jp nz,ClearScreenBlock_2
pop hl
add hl,bc ; next line
dec d ; rows
jp nz,ClearScreenBlock_1
pop bc
ret
;Inputs:
; (seed1) contains a 16-bit seed value
; (seed2) contains a NON-ZERO 16-bit seed value
;Outputs:
; HL is the result
; BC is the result of the LCG, so not that great of quality
; DE is preserved
;Destroys:
; AF
;cycle: 4,294,901,760 (almost 4.3 billion)
; https://wikiti.brandonw.net/index.php?title=Z80_Routines:Math:Random#Combined_LFSR.2FLCG.2C_16-bit_seeds
Random16:
ld hl,(Random16_seed1)
ld b,h
ld c,l
add hl,hl
add hl,hl
inc l
add hl,bc
ld (Random16_seed1),hl
ld hl,(Random16_seed2)
add hl,hl
sbc a,a
and %00101101
xor l
ld l,a
ld (Random16_seed2),hl
add hl,bc
ret
Random16_seed1: dw 12345
Random16_seed2: dw 54321
GetRandomByte:
push bc
call Random16
pop bc
ld a,h
xor l
ret
;
; Get random number 0..7
GetRandom8:
call GetRandomByte
rra
rra
and $07
ret
;
; Get random number 0..10 for door access codes
; value 10 is for '-' char and we made its probability lower by 1/3
GetRandom11:
call GetRandomByte
rra
and $1F ; 0..31
GetRandom11_1:
cp 11 ; less than 11?
ret c ; yes => return 0..10
sub 11 ; 0..20, then 0..9
jp GetRandom11_1
; Compare HL and DE
CpHLDE:
push HL
LD a,l
SBC A,e
LD l,a
LD a,h
SBC A,d
LD h,a
JP C,$+7
OR l
JP $+5
OR l
SCF
pop HL
ret
; Short sound on look/shoot action
SoundLookShoot:
;TODO
ret
;----------------------------------------------------------------------------
INCLUDE "desolcodb.asm"
DesolateCodeEnd:
;----------------------------------------------------------------------------
DesolateFontBeg:
INCLUDE "desolfont.asm"
DesolateTilsBeg:
INCLUDE "desoltils.asm"
DesolateStrsBeg:
INCLUDE "desolstrs.asm"
DesolateDataBeg:
INCLUDE "desoldata.asm"
;----------------------------------------------------------------------------
DesolateXallEnd:
; Shadow screen, 192 x 140 pixels
; 12*2*(64*2+12) = 3360 bytes
ShadowScreen EQU $9A00
IF DesolateXallEnd > ShadowScreen
.ERROR DesolateXallEnd overlaps ShadowScreen
ENDIF
MirrorTab EQU 0A800h
IF ShadowScreen + 3360 > MirrorTab
.ERROR DesolateXallEnd overlaps MirrorTab
ENDIF
;----------------------------------------------------------------------------
DesolateXxxEnd EQU MirrorTab + 256
END