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forth.asm
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.const SIO = %F0
.const TMR = %F1
.const T1 = %F2
.const PRE1 = %F3
.const T0 = %F4
.const PRE0 = %F5
.const P2M = %F6
.const P3M = %F7
.const P01M = %F8
.const IPR = %F9
.const IRQ = %FA
.const IMR = %FB
.const FLAGS = %FC
.const RP = %FD
.const SPH = %FE
.const SPL = %FF
.ORG %E000
; rr2 = top value of data stack (TOS)
; r15 = pointer to data stack (in registers)
; precise: pointer to the second data stack entry
M_E000:
; header for invocation from basic
.data %8b %08 ; JR %E00A
.data "C%E00A\r" %00
M_E00A:
JP M_E0C7
M_E00D:
CALL M_E208 ; popIntoRr4
LD R8, R2
XOR R8, R4
OR R2, R2
JR PL, M_E01E
COM R2
COM R3
INCW R2
M_E01E: OR R4, R4
JR PL, M_E028
COM R4
COM R5
INCW R4
M_E028: LD R9, #%10
LD R10, #0
LD R11, #0
M_E02E: RRC R4
RRC R5
JR NC, M_E038
ADD R11, R3
ADC R10, R2
M_E038: RRC R10
RRC R11
RRC R6
RRC R7
DJNZ R9, M_E02E
LD R2, R10
LD R3, R11
RET
M_E047: CALL M_E208 ; popIntoRr4
LD R8, R2
XOR R8, R4
OR R4, R4
JR PL, M_E058
COM R4
COM R5
INCW R4
M_E058: LD R10, R4
LD R11, R5
CALL M_E208 ; popIntoRr4
OR R4, R4
JR PL, M_E071
COM R4
COM R5
COM R2
COM R3
INCW R2
JR NZ, M_E071
INCW R4
M_E071: CLR R6
CLR R7
LD R9, #%20
RLC R3
RLC R2
RLC R5
RLC R4
M_E07F: RLC R7
RLC R6
SUB R7, R11
SBC R6, R10
JR NC, M_E08D
ADD R7, R11
ADC R6, R10
M_E08D: CCF
RLC R3
RLC R2
RLC R5
RLC R4
DJNZ R9, M_E07F
RET
; pushRr4
M_E099: CALL M_E0A7 ; prepareForPushOrError
LD @R15, R2 ; store rr2 (TOS) on data stack
DEC R15
LD @R15, R3
LD R2, R4 ; make rr4 to TOS
LD R3, R5
RET
; prepareForPushOrError
M_E0A7: DEC R15 ; check for available data stack space
LD R6, #%37 ; if full, show "#MSG 7"
CP R15, #%21
JP C, M_E0B2
RET
M_E0B2: CALL M_E221 ; printString
.data %06
.data "\r#MSG "
NOP
LD %5A, R6
CALL %0827
CALL %0AD4
JR M_E0DD
; start
M_E0C7:
SRP #%10
CALL M_E221 ; printString
.data %10 %0C
.data " JU+TE-FORTH\r\n\r"
M_E0DD: LD R15, #%50
DI
SRP #%F0
LD R15, #0
LD R14, #%FE
LD R11, #%10
LD R9, #8
M_E0EA: LD R8, #%92
LD R7, #0
LD R5, #7
LD R4, #%40
LD R1, #3
SRP #%10
LD %7C, #%0A
LD %7D, #%DA
EI
M_E0FD: SRP #%10
CALL M_E221 ; printString
.data %04
.data " OK\r"
CALL M_E23D ; QUERY
CALL M_E6D7
JP M_E0FD
M_E110: LD R2, R4
LD R3, R5
M_E114: RET
; [rr4] = 0
M_E115: LD R8, #0
LDE @RR4, R8
RET
M_E11A: CALL M_E099 ; pushRr4
LD R10, #%14
RET
M_E120: CALL M_E208 ; popIntoRr4
LD R6, R2
LD R7, R3
SUB R7, R5
SBC R6, R4
RET
; ( d c b a -- )
; load 4 data stack entries into rr10, rr8, rr4 and rr2
M_E12C: CALL M_E208 ; popIntoRr4 (rr2 = b, rr4 = a)
LD R8, R2 ; rr8 = b
LD R9, R3
LD R10, R4 ; rr10 = a
LD R11, R5
CALL M_E208 ; popIntoRr4 (rr2 = c, rr4 = b)
JP M_E208 ; popIntoRr4 (rr2 = d, rr4 = c)
M_E13D: CALL M_E5EA
CALL M_E603
LD R12, R2
LD R13, R3
JP M_E208 ; popIntoRr4
M_E14A: CALL M_E9FD
JP M_E5F4
; negate ( x -- -x )
M_E150: COM R2
COM R3
INCW R2
RET
M_E157: CALL M_E12C
SUB R3, R9
SBC R2, R8
SBC R5, R11
SBC R4, R10
RET
M_E163: CALL M_E157
CLR R2
CLR R3
RET
M_E16B: CALL M_E9FD
CALL M_E5F4
LD R4, R2
OR R4, R3
LD R6, #%44
JP Z, M_E0B2
JP M_E198
M_E17D: CLR %6D
CALL %0C56
JR NZ, M_E17D
CLR %6D
JP M_E099 ; pushRr4
M_E189: CALL M_EC7D
JP M_EC3E
M_E18F: LD %5A, #%22
CALL %0827
JP M_EC3E
M_E198: CALL M_E208 ; popIntoRr4
JP M_E208 ; popIntoRr4
.repeat 77
.data %00
.end
.data "69135"
.data "79691-20121-F412"
M_E200: .data %84
.data "DROP"
.data %00 %00 %00
; popIntoRr4
M_E208: LD R4, R2
LD R5, R3
LD R3, @R15
INC R15
LD R2, @R15
; prepareForDropCheckEmpty
M_E211: INC R15
LD R6, #%31
CP R15, #%51 ; if empty, show #MSG 1
JP NC, M_E0B2
RET
M_E21B: .data %82
.data ".\""
.data M_E200 %0e
; printString
; call printString
; n
; c1 ... cn
M_E221: POP R4
POP R5
LDC R8, @RR4
INCW R4
M_E229: LD R7, #%5A
LDCI @R7, @RR4
CALL %0827
DJNZ R8, M_E229
JP @RR4
M_E234: .data %85
.data "QUERY"
.data M_E21B %00
M_E23D: LD %5A, #%5C ; '\'
CALL %0827
M_E243: CALL %0824
CP %5A, #%0D ; '\r'
JR NZ, M_E243
LD R4, #%FD
LD R5, %5B
INC R5
CALL M_E115 ; [rr4] = 0
M_E253: LD R6, #%30
OR R5, R5
JP Z, M_E0B2
DEC R5
LDE R6, @RR4
CP R6, #%5C ; '\'
JR NZ, M_E253
LD R6, #%20
LDE @RR4, R6 ; [rr4] = ' '
CALL M_E099 ; pushRr4 -> push address of entered string
CALL M_E277 ; TIB
JP M_E281 ; @TIB = rr4
M_E270: .data %83
.data "TIB"
.data M_E234 %00
; put the (address) %E27A onto the data stack
M_E277: CALL M_E294
M_E27A: .data %FD %71
M_E27C: .data %81 %21
.data %E2 %70 %00
; ( v a -- ) store value v into address a
M_E281: CALL M_E208 ; popIntoRr4
LDC @RR4, R2
INCW R4
LDC @RR4, R3
JP M_E208 ; popIntoRr4
M_E28D: .data %83
.data "VAR"
.data M_E27C %0a
; call M_E294 will put the next address (after the call M_E294) onto the data stack
M_E294: CALL M_E099 ; pushRr4
POP R2
POP R3
RET
M_E29C: .data %83
.data "CON" ; constant
.data M_E28D %0a
; the 2 bytes constant after call M_E2A3 will be stored onto the data stack
M_E2A3: CALL M_E099 ; pushRr4
POP R6
POP R7
LD R10, #%12
LDCI @R10, @RR6
LDCI @R10, @RR6
RET
M_E2B1: .data %83
.data "LIT" ; literal
.data M_E29C %0a
; the 2 bytes constant after call M_E2B8 will be stored onto the data stack (like for CON) but proceeded with the next command after the call
M_E2B8: POP R8
POP R9
LD R10, #%14
M_E2BE: LDCI @R10, @RR8
LDCI @R10, @RR8
CALL M_E099 ; pushRr4
JP @RR8
M_E2C7: .data %84
.data "DLIT"
.data M_E2B1 %0c
M_E2CF: POP R8
POP R9
CALL M_E11A
LDCI @R10, @RR8
LDCI @R10, @RR8
LD R10, #%12
JR M_E2BE
M_E2DE: .data %83
.data "ROT"
.data M_E2C7 %00
M_E2E5: LD R5, @R15
LD @R15, R3
INC R15
LD R4, @R15
LD @R15, R2
INC R15
LD R3, @R15
LD @R15, R5
CALL M_E211 ; prepareForDropCheckEmpty
LD R2, @R15
LD @R15, R4
SUB R15, #3
RET
M_E2FE: .data %84
.data "SWAP"
.data M_E2DE %00
M_E306: LD R5, @R15
LD @R15, R3
CALL M_E211 ; prepareForDropCheckEmpty
LD R4, @R15
LD @R15, R2
LD R2, R4
LD R3, R5
DEC R15
RET
M_E318: .data %83
.data "DUP"
.data M_E2FE %00
M_E31F: CALL M_E0A7 ; prepareForPushOrError
LD @R15, R2
DEC R15
LD @R15, R3
RET
M_E329: .data %84
.data "?DUP" ; duplicate if TOS != 0
.data M_E318 %00
M_E331: LD R4, R2
OR R4, R3
JR NZ, M_E31F
RET
M_E338: .data %83
.data "CLS"
.data M_E329 %00
M_E33F: JP %08DD
M_E342: .data %84
.data "OVER" ; ( x y -- x y x )
.data M_E338 %00
M_E34A: LD R5, @R15
INC R15
LD R4, @R15
DEC R15
JP M_E099 ; pushRr4
M_E354: .data %82
.data ">R" ; ( x -- ) push x to return stack
.data M_E342 %00
M_E35A: POP R4
POP R5
PUSH R3
PUSH R2
LD R3, @R15
INC R15
LD R2, @R15
CALL M_E211 ; prepareForDropCheckEmpty
JP @RR4
M_E36C: .data %82
.data "R>" ; ( -- x ) pop from return stack
.data M_E354 %00
M_E372: POP R8
POP R9
CALL M_E099
POP R2
POP R3
JP @RR8
M_E37F: .data %81
.data "R" ; ( -- x ) get return stack value
.data M_E36C %00
M_E384: CALL M_E099 ; pushRr4
POP R4
POP R5
POP R2
POP R3
PUSH R3
PUSH R2
JP @RR4
M_E395: .data %81
.data "+"
.data M_E37F %00
M_E39A: ADD R3, @R15
INC R15
ADC R2, @R15
JP M_E211 ; prepareForDropCheckEmpty
M_E3A2: .data %81
.data "-"
.data M_E395 %00
M_E3A7: DEC %0 ; ? =====================
CALL M_E208 ; popIntoRr4
SUB R3, R5
SBC R2, R4
RET
M_E3B1: .data %81
.data "*"
.data M_E3A2 %00
M_E3B6: CALL M_E208 ; popIntoRr4
JP %00BA
M_E3BC: .data %81
.data "/"
.data M_E3B1 %00
M_E3C1: CALL M_E208 ; popIntoRr4
JP %00E0
M_E3C7: .data %83
.data "MOD"
.data M_E3BC %00
M_E3CE: CALL %E208
JP %011F
M_E3D4: .data %82
.data "1+"
.data M_E3C7 %00
M_E3DA: INCW R2
RET
M_E3DD: .data %86
.data "NEGATE"
.data M_E3D4 %00
M_E3E7: JP %E150
M_E3EA: NOP
M_E3EB: .data %83
.data "ABS"
.data M_E3DD %00
M_E3F2: OR R2, R2
JR MI, M_E3E7
RET
M_E3F7: .data %82
.data "U*"
.data M_E3EB %00
M_E3FD: CALL M_E208 ; popIntoRr4
CALL M_E028
JR M_E425
DEC R15
LD @R15, R7
RET
M_E40A: .data %82
.data "M*"
.data M_E3F7 %00
M_E410: CALL M_E00D
OR R8, R8
JR PL, M_E425
COM R2
COM R3
COM R6
COM R7
INCW R6
JR NZ, M_E425
INCW R2
M_E425: DEC R15
LD @R15, R6
DEC R15
LD @R15, R7
RET
M_E42E: .data %82
.data "M/"
.data M_E40A %00
M_E434: CALL M_E047
OR R8, R8
JR PL, M_E425
COM R2
COM R3
INCW R2
COM R6
COM R7
INCW R6
JR M_E425
M_E449: .data %82
.data "U/"
.data M_E42E %00
M_E44F: CALL M_E208 ; popIntoRr4
LD R10, R4
LD R11, R5
CALL M_E208 ; popIntoRr4
CALL M_E071
JR M_E425
M_E45E: .data %85
.data "*/MOD"
.data M_E449 %00
M_E467: CALL M_E2E5
CALL M_E2E5
CALL M_E410
CALL M_E2E5
JR M_E434
M_E475: .data %82
.data "*/"
.data M_E45E %00
M_E47B: CALL M_E467
CALL M_E306
JP M_E208 ; popIntoRr4
M_E484: .data %85
.data "M/MOD"
.data M_E475 %00
M_E48D: CALL M_E208
LD R10, R4
LD R11, R5
CALL M_E208 ; popIntoRr4
CALL M_E071
DEC R15
LD @R15, R6
DEC R15
LD @R15, R7
JP M_E099 ; pushRr4
M_E4A5: .data %82
.data "DO"
.data M_E484 %80
M_E4AB: CALL M_E208 ; popIntoRr4
POP R8
POP R9
PUSH R3
PUSH R2
PUSH R5
PUSH R4
CALL M_E208 ; popIntoRr4
JP @RR8
M_E4BF: .data %85
.data "+LOOP"
.data M_E4A5 %22
M_E4C8: POP R8
POP R9
POP R4
POP R5
POP R6
POP R7
PUSH R7
PUSH R6
ADD R5, R3
ADC R4, R2
PUSH R5
PUSH R4
LD R3, #%1A
LDCI @R3, @RR8
LDCI @R3, @RR8
SUB R5, R7
SBC R4, R6
XOR R2, R4
LD R7, R4
OR R7, R5
CALL M_E208 ; popIntoRr4
OR R7, R7
JR Z, M_E4FD
RL R4
JR NC, M_E4FD
JP @RR10
M_E4FD: POP R4
POP R4
POP R4
POP R4
JP @RR8
M_E507: .data %84
.data "LOOP"
.data M_E4BF %22
M_E50F: CALL M_E099
LD R2, #0
LD R3, #1
JR M_E4C8
M_E518: .data %81
.data "I"
.data M_E507 %00
M_E51D: JP M_E384
M_E520: .data %85
.data "LEAVE"
.data M_E518 %00
M_E529: POP R8
POP R9
POP R4
POP R5
POP R6
POP R7
PUSH R5
PUSH R4
PUSH R5
PUSH R4
JP @RR8
M_E53F: .data %85
.data "BEGIN"
.data M_E520 %80
M_E548: RET
M_E549: .data %85
.data "UNTIL"
.data M_E53F %22
M_E552: CALL M_E208 ; popIntoRr4
POP R8
POP R9
LD R10, #%16
LDCI @R10, @RR8
LDCI @R10, @RR8
OR R4, R5
JR Z, M_E565
JP @RR8
M_E565: JP @RR6
M_E567: .data %85
.data "WHILE"
.data M_E549 %42
M_E570: JR M_E552
M_E572: .data %86
.data "REPEAT"
.data M_E567 %32
M_E57C: POP R8
POP R9
LD R10, #%16
LDCI @R10, @RR8
LDCI @R10, @RR8
JP @RR6
M_E588: .data %85
.data "AGAIN"
.data M_E572 %22
M_E591: JR M_E57C
M_E593: .data %83
.data "KEY"
.data M_E588 %00
M_E59A: CALL %0C1D
LD R4, #0
LD R5, %5A
JP M_E099 ; pushRr4
M_E5A4: .data %82
.data "CR"
.data M_E593 %00
M_E5AA: JP %0ACE
M_E5AD: .data %84
.data "EMIT"
.data M_E5A4 %00
M_E5B5: CALL M_E208
LD %5A, R5
JP %0827
M_E5BD: .data %84
.data "KEY?"
.data M_E5AD %00
M_E5C5: CLR %6D
CALL %0C56
LD R4, #0
LD R5, %6D
JP M_E099 ; pushRr4
M_E5D1: LD R5, %6D
JP M_E099 ; pushRr4
M_E5D6: .data %82
.data "DP"
.data M_E5BD %00
; put the (address) %E5DF onto the data stack
M_E5DC: CALL M_E294
.data %F4 %65 %FF ;???
M_E5E2: .data %84
.data "HERE"
.data M_E5D6 %00
M_E5EA: CALL M_E5DC
JR M_E5F4
M_E5EF: .data %81
.data "@"
.data M_E5E2 %00
M_E5F4: LDC R4, @RR2
INCW R2
LDC R3, @RR2
LD R2, R4
RET
M_E5FD: .data %82
.data "2+"
.data M_E5EF %00
M_E603: INCW R2
M_E605: INCW R2
RET
M_E608: .data %87
.data "ENCLOSE"
.data M_E5FD %00
M_E613: LD R0, #0
LD R1, #%80
LD R4, R2
LD R5, R3
LD R7, #%20
M_E61D: LDE R6, @RR4
OR R6, R6
JR Z, M_E63A
LD R1, R5
CALL M_E643
CP R6, R7
JR Z, M_E61D
M_E62C: LDE R6, @RR4
OR R6, R6
JR Z, M_E63A
INC R0
CALL M_E643
CP R6, R7
JR NZ, M_E62C
M_E63A: DEC R1
LD R3, R5
LD R5, R1
LDE @RR4, R0
RET
M_E643: INC R5
TCM R5, #%0D
JR NZ, M_E64C
ADD R5, #3
M_E64C: RET
M_E64D: .data %85
.data "-FIND"
.data M_E608 %00
M_E656: CALL M_E5EA ; HERE
M_E659: LDC R8, @RR2
INCW R2
LDC R9, @RR2
LD R3, R8
OR R3, R9
LD R2, #0
JR NZ, M_E668
RET
M_E668: LD R4, #%FD
LD R5, R1
LDE R6, @RR4
LDC R7, @RR8
AND R7, #%7F
CP R6, R7
JR Z, M_E680
M_E677: SCF
ADC R9, R7
ADC R2, R8
LD R3, R9
JR M_E659
M_E680: CALL M_E643
M_E683: INCW R8
LDE R10, @RR4
LDC R11, @RR8
CALL M_E643
DEC R7
CP R10, R11
JR NZ, M_E677
OR R7, R7
JR NZ, M_E683
ADD R9, #3
ADC R8, R7
LDC R14, @RR8
LD R2, R8
LD R3, R9
INCW R2
RET
M_E6A4: .data %86
.data "EXPECT"
.data M_E64D %00
M_E6AE: CALL M_E208 ; popIntoRr4
M_E6B1: CALL %0824
LD R6, #%5A
LDCI @RR2, @R6
CP %5A, #%0D
JR Z, M_E6C1
DECW R4
JR NZ, M_E6B1
M_E6C1: LD R6, #0
DECW R2
LDC @RR2, R6
JP M_E208 ; popIntoRr4
M_E6CA: .data %89
.data "INTERPRET"
.data M_E6A4 %00
M_E6D7: CALL M_E97A
M_E6DA: CALL M_E277 ; TIB
CALL M_E5F4
CALL M_E14A
CALL M_E208 ; popIntoRr4
OR R4, R5
JR NZ, M_E6ED
CALL M_E13D
M_E6ED: CALL M_E613
OR R0, R0
JR NZ, M_E71B
CALL M_E93A
M_E6F7: CALL M_E277 ; TIB
CALL M_E281
CALL M_E9FD
CALL M_E5F4
CALL M_E208 ; popIntoRr4
OR R4, R5
JR Z, M_E70C
RET
NOP
M_E70C: LD R6, #%AF
LDC @RR12, R6
CALL M_E5EA
CALL M_E603
CALL M_E208 ; popIntoRr4
JP @RR4
M_E71B: CALL M_E656
CALL M_E208 ; popIntoRr4
LD R6, R4
OR R6, R5
JR NZ, M_E768
CALL M_E807
CALL M_E96D
CALL M_E5F4
CALL M_E208 ; popIntoRr4
CALL M_E7F6
LD R6, #%E2
LDC @RR12, R6
INCW R12
INCW R4
JR Z, M_E74E
LD R6, #%CF
LDC @RR12, R6
INCW R12
LD R6, #%12
LDCI @RR12, @R6
LDCI @RR12, @R6
JR M_E754
M_E74E: LD R6, #%B8
LDC @RR12, R6
INCW R12
M_E754: CALL M_E208 ; popIntoRr4
LD R6, #%12
LDCI @RR12, @R6
LDCI @RR12, @R6
CALL M_E208 ; popIntoRr4
M_E760: CALL M_E277 ; TIB
CALL M_E5F4
JR M_E6ED
M_E768: TM R14, #1
JR Z, M_E77D
PUSH R5
PUSH R4
CALL M_E6F7
POP R4
POP R5
CALL @RR4
JP M_E6DA
M_E77D: CALL M_E7F6
LD R6, #%14
LDCI @RR12, @R6
LDCI @RR12, @R6
LD R10, R12
LD R11, R13
LD R6, R14
AND R6, #6
JR Z, M_E7C1
CP R6, #2
JR Z, M_E79F
CP R6, #4
JR NZ, M_E7A5
INCW R12
INCW R12
M_E79F: INCW R12
INCW R12
JR M_E7C1
M_E7A5: CLR R7
M_E7A7: INCW R12
LDE R6, @RR2
INC R3
TCM R3, #%0D
JR NZ, M_E7B4
ADD R3, #3
M_E7B4: CP R6, #%22
JR Z, M_E7BE
LDC @RR12, R6
INC R7
JR M_E7A7
M_E7BE: LDC @RR10, R7
NOP
M_E7C1: TM R14, #%10
JR Z, M_E7D0
POP R8
POP R9
LDC @RR8, R12
INCW R8
LDC @RR8, R13
M_E7D0: TM R14, #%20
JR Z, M_E7E1
POP R8
POP R9
LDC @RR10, R8
INCW R10
LDC @RR10, R9
DECW R10
M_E7E1: TM R14, #%40
JR Z, M_E7EA
PUSH R11
PUSH R10