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2048.ASM
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; 2048
;
; Join the numbers and get to the 2048 tile.
;
; Commands:
;
; Use the arrow keys to move the tiles.
; When two tiles with the same number touch, they merge into one.
;
; w, s, a, d - Alternate keys (up, down, left, right)
; CTRL-E, CTRL-X, CTRL-S, CTRL-D - Wordstar-compatible control keys
;
; Compile:
;
; TASM -80 -b 2048.ASM 2048.COM
;
; Credits:
;
; Based on 2048 created by Gabriele Cirulli.
; Based on the console version for GNU/Linux by Maurits van der Schee
; Ported to Z80 and CP/M by Marco Maccaferri <macca@maccasoft.com>
CTRL_A .EQU 1
CTRL_B .EQU 2
CTRL_C .EQU 3
CTRL_D .EQU 4
CTRL_E .EQU 5
CTRL_F .EQU 6
CTRL_G .EQU 7
CTRL_H .EQU 8
CTRL_I .EQU 9
CTRL_J .EQU 10
CTRL_K .EQU 11
CTRL_L .EQU 12
CTRL_M .EQU 13
CTRL_N .EQU 14
CTRL_O .EQU 15
CTRL_P .EQU 16
CTRL_Q .EQU 17
CTRL_R .EQU 18
CTRL_S .EQU 19
CTRL_T .EQU 20
CTRL_U .EQU 21
CTRL_V .EQU 22
CTRL_W .EQU 23
CTRL_X .EQU 24
CTRL_Y .EQU 25
CTRL_Z .EQU 26
BEL .EQU 07H
FF .EQU 0CH
CR .EQU 0DH
LF .EQU 0AH
EOS .EQU 24H
BDOS .EQU 0005H
BOARD_X .EQU 25H
BOARD_Y .EQU 06H
.ORG 0100H
LD A,R
LD (RAND16+1),A
LD A,R
LD (RAND16+2),A
LD DE,INIT
LD C,09H
CALL BDOS
CALL ADDRANDOM
CALL ADDRANDOM
CALL DRAWBORDER
CALL DRAWBOARD
LOOP2 LD A,BOARD_X
LD (XPOS),A
LD A,BOARD_Y
ADD A,13H
DAA
LD (YPOS),A
CALL GOTOXY
LD DE,MSG1
LD C,09H
CALL BDOS
LOOP:
LD C,06H
LD E,0FFH
CALL BDOS
CP 0
JP Z,LOOP
CP 'a'
JP C,K3
CP '{'
JP NC,K3
AND 5FH
K3 CP CTRL_C
JP Z,EXIT
CP CTRL_E
JP Z,TOP
CP CTRL_X
JP Z,BOTTOM
CP CTRL_D
JP Z,RIGHT
CP CTRL_S
JP Z,LEFT
CP 'W'
JP Z,TOP
CP 'S'
JP Z,BOTTOM
CP 'D'
JP Z,RIGHT
CP 'A'
JP Z,LEFT
CP 'Q'
JP Z,QUIT
CP 1BH
JP Z,K1
LD C,02H
LD E,BEL
CALL BDOS
JP LOOP
K1 LD C,06H
LD E,0FFH
CALL BDOS
CP 0
JP Z,K1
CP 'O'
JP NZ,K2
K4 LD C,06H
LD E,0FFH
CALL BDOS
CP 0
JP Z,K4
K2 CP 'A'
JP Z,TOP
CP 'B'
JP Z,BOTTOM
CP 'C'
JP Z,RIGHT
CP 'D'
JP Z,LEFT
LD C,02H
LD E,BEL
CALL BDOS
JP LOOP
LOOP1 LD A,(MOVED)
CP 0
JP Z,LOOP
CALL DRAWBOARD
CALL ADDRANDOM
CALL DRAWBOARD
CALL ISOVER
CP 1
JP Z,GAMEOVER
JP LOOP
TOP:
CALL ROTATE
CALL ROTATE
CALL ROTATE
CALL MOVEMERGE
CALL ROTATE
JP LOOP1
BOTTOM:
CALL ROTATE
CALL MOVEMERGE
CALL ROTATE
CALL ROTATE
CALL ROTATE
JP LOOP1
RIGHT:
CALL ROTATE
CALL ROTATE
CALL MOVEMERGE
CALL ROTATE
CALL ROTATE
JP LOOP1
LEFT:
CALL MOVEMERGE
JP LOOP1
QUIT:
LD A,BOARD_X
LD (XPOS),A
LD A,BOARD_Y
ADD A,13H
DAA
LD (YPOS),A
CALL GOTOXY
LD DE,MSG2
LD C,09H
CALL BDOS
Q1 LD C,06H
LD E,0FFH
CALL BDOS
CP 0
JP Z,Q1
CP 'y'
JP Z,EXIT
CP 'Y'
JP Z,EXIT
CP 'n'
JP Z,LOOP2
CP 'N'
JP Z,LOOP2
LD C,02H
LD E,BEL
CALL BDOS
JP Q1
GAMEOVER:
LD A,BOARD_X
LD (XPOS),A
LD A,BOARD_Y+13H
DAA
LD (YPOS),A
CALL GOTOXY
LD DE,MSG3
LD C,09H
CALL BDOS
EXIT:
LD DE,TERM
LD C,09H
CALL BDOS
RET
ISOVER:
LD A,1
LD (RESULT),A
LD B,16
LD HL,BOARD
G1: LD A,(HL)
CP 13
JP Z,GR
INC HL
DJNZ G1
CALL CANMERGE
CP 0
JP Z,G2
XOR A
LD (RESULT),A
G2: CALL ROTATE
CALL CANMERGE
CP 0
JP Z,G3
XOR A
LD (RESULT),A
G3: CALL ROTATE
CALL CANMERGE
CP 0
JP Z,G4
XOR A
LD (RESULT),A
G4: CALL ROTATE
CALL CANMERGE
CP 0
JP Z,G5
XOR A
LD (RESULT),A
G5: CALL ROTATE
GR: LD A,(RESULT)
RET
CANMERGE:
LD HL,BOARD
LD (BOARDPTR),HL
CALL TESTMERGE
CP 1
RET Z
LD HL,BOARD+4
LD (BOARDPTR),HL
CALL TESTMERGE
CP 1
RET Z
LD HL,BOARD+8
LD (BOARDPTR),HL
CALL TESTMERGE
CP 1
RET Z
LD HL,BOARD+12
LD (BOARDPTR),HL
CALL TESTMERGE
RET
TESTMERGE:
LD DE,(BOARDPTR)
LD HL,(BOARDPTR)
INC HL
LD B,3
M8 LD A,(DE)
CP 0
JP Z,M7
LD C,(HL)
CP C
JP Z,M7
INC HL
INC DE
DJNZ M8
XOR A
RET
M7 LD A,1
RET
MOVEMERGE:
XOR A
LD (MOVED),A
LD HL,BOARD
LD (BOARDPTR),HL
CALL MERGE
LD HL,BOARD+4
LD (BOARDPTR),HL
CALL MERGE
LD HL,BOARD+8
LD (BOARDPTR),HL
CALL MERGE
LD HL,BOARD+12
LD (BOARDPTR),HL
CALL MERGE
RET
ADDRANDOM:
LD DE,0
LD B,16
LD HL,BOARD
N2 LD A,(HL)
CP 0
JP NZ,N1
INC E
N1 INC HL
DJNZ N2
LD A,E
CP 0
RET Z
PUSH DE
CALL RAND16
POP DE
CALL DIV16
LD B,L
N4: LD C,16
LD HL,BOARD
N5: LD A,(HL)
CP 0
JP NZ,N3
DEC B
JP Z,N6
N3: INC HL
DEC C
JP NZ,N5
JP N4
N6 PUSH HL
CALL RAND16
LD DE,10
CALL DIV16
LD DE,9
CALL DIV16
LD A,E
INC A
POP HL
LD (HL),A
RET
MERGE:
CALL COLLAPSE
; merge tiles with same value
LD DE,(BOARDPTR)
LD HL,(BOARDPTR)
INC HL
LD B,3
M6: LD A,(DE)
CP 0
RET Z
LD C,(HL)
CP C
JP NZ,M5
INC A
LD (DE),A
CALL ADDPOINTS
XOR A
LD (HL),A
LD A,(MOVED)
INC A
LD (MOVED),A
PUSH DE
PUSH HL
CALL COLLAPSE
POP HL
POP DE
M5: INC HL
INC DE
DJNZ M6
RET
COLLAPSE:
; collapse all tiles
LD HL,(BOARDPTR)
LD B,4 ; find first zero
M1: LD A,(HL)
CP 0
JP Z,M2
INC HL
DJNZ M1
RET
M2: LD E,L ; DE=fist zero position
LD D,H
M4: LD A,(HL) ; move all non-zero tiles
CP 0
JP Z,M3
LD (DE),A
INC DE
XOR A
LD (HL),A
LD A,(MOVED)
INC A
LD (MOVED),A
M3: INC HL
DJNZ M4
RET
ROTATE:
; outer ring
LD B,3
R1: LD A,(BOARD+3)
LD C,A
LD A,(BOARD+2)
LD (BOARD+3),A
LD A,(BOARD+1)
LD (BOARD+2),A
LD A,(BOARD+0)
LD (BOARD+1),A
LD A,(BOARD+4)
LD (BOARD+0),A
LD A,(BOARD+8)
LD (BOARD+4),A
LD A,(BOARD+12)
LD (BOARD+8),A
LD A,(BOARD+13)
LD (BOARD+12),A
LD A,(BOARD+14)
LD (BOARD+13),A
LD A,(BOARD+15)
LD (BOARD+14),A
LD A,(BOARD+11)
LD (BOARD+15),A
LD A,(BOARD+7)
LD (BOARD+11),A
LD A,C
LD (BOARD+7),A
DJNZ R1
; inner ring
LD A,(BOARD+6)
LD C,A
LD A,(BOARD+5)
LD (BOARD+6),A
LD A,(BOARD+9)
LD (BOARD+5),A
LD A,(BOARD+10)
LD (BOARD+9),A
LD A,C
LD (BOARD+10),A
RET
ADDPOINTS:
PUSH DE
PUSH HL
LD E,A
LD D,0
LD HL,POINTS
ADD HL,DE
ADD HL,DE
LD E,(HL)
INC HL
LD D,(HL)
LD A,(SCORE+3)
ADD A,E
DAA
LD (SCORE+3),A
LD A,(SCORE+2)
ADC A,D
DAA
LD (SCORE+2),A
LD A,(SCORE+1)
ADC A,00H
DAA
LD (SCORE+1),A
LD A,(SCORE)
ADC A,00H
DAA
LD (SCORE),A
POP HL
POP DE
RET
PRINTSCORE:
LD HL,SCORE
LD DE,SCORESTR+4
LD B,4
P1 LD A,(HL)
RRA
RRA
RRA
RRA
AND 0FH
ADD A,30H
LD (DE),A
INC DE
LD A,(HL)
AND 0FH
ADD A,30H
LD (DE),A
INC DE
INC HL
DJNZ P1
LD HL,SCORESTR+4
LD B,7
P3 LD A,(HL)
CP 30H
JP NZ,P2
LD A,20H
LD (HL),A
INC HL
DJNZ P3
P2 LD A,BOARD_X
ADD A,16H
DAA
LD (XPOS),A
LD A,BOARD_Y
SUB 02H
DAA
LD (YPOS),A
CALL GOTOXY
LD DE,SCORESTR
LD C,09H
CALL BDOS
RET
DRAWBORDER:
LD A,BOARD_X
LD (XPOS),A
LD A,BOARD_Y
SUB 02H
DAA
LD (YPOS),A
CALL GOTOXY
LD DE,MSG4
LD C,09H
CALL BDOS
LD A,BOARD_X
SUB 01H
DAA
LD (XPOS),A
LD A,BOARD_Y
SUB 01H
DAA
LD (YPOS),A
CALL GOTOXY
LD DE,TOPBORDER
LD C,09H
CALL BDOS
LD B,12
L4 PUSH BC
LD A,(YPOS)
ADD A,1
DAA
LD (YPOS),A
CALL GOTOXY
LD C,02H
LD E,0DBH
CALL BDOS
LD DE,ADVANCE
LD C,09H
CALL BDOS
LD C,02H
LD E,0DBH
CALL BDOS
POP BC
DEC B
JP NZ,L4
LD A,(YPOS)
ADD A,1
DAA
LD (YPOS),A
CALL GOTOXY
LD DE,BTMBORDER
LD C,09H
CALL BDOS
RET
DRAWBOARD:
CALL PRINTSCORE
LD A,BOARD_X
LD (XPOS),A
LD A,BOARD_Y
SUB 01H
DAA
LD (YPOS),A
LD HL,BOARD
LD B,4
L1 PUSH BC
PUSH HL
LD A,(YPOS)
ADD A,1
DAA
LD (YPOS),A
CALL GOTOXY
POP HL
PUSH HL
LD E,(HL)
CALL PRINTSPACE
POP HL
INC HL
PUSH HL
LD E,(HL)
CALL PRINTSPACE
POP HL
INC HL
PUSH HL
LD E,(HL)
CALL PRINTSPACE
POP HL
INC HL
PUSH HL
LD E,(HL)
CALL PRINTSPACE
CALL NEWLINE
POP HL
DEC HL
DEC HL
DEC HL
PUSH HL
LD A,(YPOS)
ADD A,1
DAA
LD (YPOS),A
CALL GOTOXY
POP HL
PUSH HL
LD E,(HL)
CALL PRINTLABEL
POP HL
INC HL
PUSH HL
LD E,(HL)
CALL PRINTLABEL
POP HL
INC HL
PUSH HL
LD E,(HL)
CALL PRINTLABEL
POP HL
INC HL
PUSH HL
LD E,(HL)
CALL PRINTLABEL
CALL NEWLINE
POP HL
DEC HL
DEC HL
DEC HL
PUSH HL
LD A,(YPOS)
ADD A,1
DAA
LD (YPOS),A
CALL GOTOXY
POP HL
PUSH HL
LD E,(HL)
CALL PRINTSPACE
POP HL
INC HL
PUSH HL
LD E,(HL)
CALL PRINTSPACE
POP HL
INC HL
PUSH HL
LD E,(HL)
CALL PRINTSPACE
POP HL
INC HL
PUSH HL
LD E,(HL)
CALL PRINTSPACE
CALL NEWLINE
POP HL
INC HL
POP BC
DEC B
JP NZ,L1
RET
PRINTSPACE:
LD D,0
PUSH DE
LD HL,COLORPTR
ADD HL,DE
ADD HL,DE
LD E,(HL)
INC HL
LD D,(HL)
LD C,09H
CALL BDOS
POP DE
LD DE,SPACER
LD C,09H
CALL BDOS
RET
PRINTLABEL:
LD D,0
PUSH DE
LD HL,COLORPTR
ADD HL,DE
ADD HL,DE
LD E,(HL)
INC HL
LD D,(HL)
LD C,09H
CALL BDOS
POP DE
PUSH DE
LD HL,LABELPTR
ADD HL,DE
ADD HL,DE
LD E,(HL)
INC HL
LD D,(HL)
LD C,09H
CALL BDOS
POP DE
RET
GOTOXY:
LD C,02H
LD E,1BH
CALL BDOS
LD C,02H
LD E,'['
CALL BDOS
LD A,(YPOS)
CP 10H
JP C,L2
RRA
RRA
RRA
RRA
AND 0FH
ADD A,'0'
LD C,02H
LD E,A
CALL BDOS
LD A,(YPOS)
L2 AND 0FH
ADD A,'0'
LD C,02H
LD E,A
CALL BDOS
LD C,02H
LD E,3BH
CALL BDOS
LD A,(XPOS)
CP 10H
JP C,L3
RRA
RRA
RRA
RRA
AND 0FH
ADD A,'0'
LD C,02H
LD E,A
CALL BDOS
LD A,(XPOS)
L3 AND 0FH
ADD A,'0'
LD C,02H
LD E,A
CALL BDOS
LD C,02H
LD E,'H'
CALL BDOS
RET
NEWLINE:
LD C,02H
LD E,CR
CALL BDOS
LD C,02H
LD E,LF
CALL BDOS
RET
RAND16 LD DE,0
LD A,D
LD H,E
LD L,253
OR A
SBC HL,DE
SBC A,0
SBC HL,DE
LD D,0
SBC A,D
LD E,A
SBC HL,DE
JR NC,RAND
INC HL
RAND LD (RAND16+1),HL
RET
DIV16:
LD A,H ; HL = HL % DE
LD C,L
LD HL,0
LD B,16
DL1 SCF
RL C
RLA
ADC HL,HL
SBC HL,DE
JR NC,$+4
ADD HL,DE
DEC C
DJNZ DL1
LD D,A ; DE = HL / DE
LD E,C
RET
BOARD
.DB 00, 00, 00, 00
.DB 00, 00, 00, 00
.DB 00, 00, 00, 00
.DB 00, 00, 00, 00
SPACER .DB " ", '$'
LABELPTR: .DW LABELS
.DW LABELS + 8
.DW LABELS + 16
.DW LABELS + 24
.DW LABELS + 32
.DW LABELS + 40
.DW LABELS + 48
.DW LABELS + 56
.DW LABELS + 64
.DW LABELS + 72
.DW LABELS + 80
.DW LABELS + 88
.DW LABELS + 96
.DW LABELS + 104
LABELS .DB " ", 0F9H, " ", EOS
.DB " 2 ", EOS
.DB " 4 ", EOS
.DB " 8 ", EOS
.DB " 16 ", EOS
.DB " 32 ", EOS
.DB " 64 ", EOS
.DB " 128 ", EOS
.DB " 256 ", EOS
.DB " 512 ", EOS
.DB " 1024 ", EOS
.DB " 2048 ", EOS
.DB " 4096 ", EOS
.DB " 8192 ", EOS
COLORPTR: .DW COLORS