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tb.asm
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;----------------------------------------------------------------------------------
; Tiny Basic port to MKHBC-8-R2 6502 computer
; by Marek Karcz 2012.
;
; Based on the work by:
;
; ================= ORIGINAL HEADER ======================================
;
; OMS-02 Firmware
;
; Bill O'Neill - Last update: 2008/12/06
;
; Tiny Basic and minimal Monitor (BIOS)
;
; This version is for the assembler that comes with
; Michal Kowalski's 6502 emulator. To run it, load it
; into the emulator, assemle it, begin debug mode then,
; set the PC to $1CF0 then run.
;
; The emulator was used to help figure out Tiny Basic
; and this code is only documented to that extent.
;
; It should be easy enough to configure this to run any-
; where in memory or convert it to assemble with any 6502
; assembler. The current location is being used as this is
; to be placed into a controller I designed (OMS-02) around
; a 6507 CPU (a 6502 variant) that has only 8k off memory.
; The memory map for the OMS-02 is;
;
; $0000-$0FFF RAM
; $1000-$13FF I/O space (ACIA is at $1200)
; $1400-$1FFF Tiny Basic and simple monitor
;
;
; Next steps:
; Write a BREAK routine that will enable a break if any charater is typed at the console
; More comments to document this code
; Investigate using assembler variables and directives to make it easy to re-locate this code
;
; ============ END OF ORIGINAL HEADER =========================================
;
; Revision history (MKHBC-8-R1 port):
;
; 1/4/2012:
; TB port created.
;
; 1/5/2012:
; Version 1.0.1.
; Added 2-byte peek routine.
;
; 1/11/2012:
; Figured out jump addresses for routines and used symbolic labels
; instead of hardcoded addresses. Relocated TB to $0400 (from $1400).
;
; 2/15/2016
; Ported to my own 6502 emulator.
;
; 2/20/2016
; Increased stack size. Changed prompt.
;
;
;--------------------------------------------------------------------------------------
;.segment "BASIC"
;
; Tiny Basic starts here
;
.org $0400 ; Start of Basic. First 1K of ROM is shaded by I/O on the OMS-02
SOBAS:
;CLRSC = ClearScreen
C_00BC = $00BC ; These are needed because my assembler
C_20 = $20 ; does not hanle standard 6502 notation
C_22 = $22 ; properly
C_24 = $24 ;
C_2A = $2A ; I may just fix this someday - HA!
C_2C = $2C ;
C_2E = $2E ;
C_B8 = $B8 ;
C_BC = $BC ;
C_C1 = $C1 ;
C_C2 = $C2 ;
C_C6 = $C6 ;
SR_V_L = SOBAS + $1E ; Base address for subroutine vector lo byte
SR_V_H = SOBAS + $1F ; Base address for subroutine vector hi byte
CV: jmp COLD_S ; Cold start vector
WV: jmp WARM_S ; Warm start vector
IN_V: jmp RCCHR ; Input routine address.
OUT_V: jmp SNDCHR ; Output routine address.
BREAK: nop ; Begin dummy break routine
clc ; Clear the carry flag
rts ; End break routine
;
; Some codes
;
BSC: .byte $5f ; Backspace code
LSC: .byte $18 ; Line cancel code
PCC: .byte $80 ; Pad character control
TMC: .byte $00 ; Tape mode control
;SSS: .byte $04 ; Spare Stack size. (was $04 but documentation suggests $20 ?)
SSS: .byte $20 ; Spare Stack size. (was $04 but documentation suggests $20 ?)
;
; Code fragment
; Seems to store or retreive a byte to/from memory and the accumulator
; ---
; M.K.: I think this code it is used from Tiny Basic programs by calling USR to store/retrieve
; data (since TB does not support arrays, this is one way to emulate them).
; This location is at exactly 20 bytes distance from the start of TB code.
; TB programs typically make USR calls to locations:
; SOBAS+20
; SOBAS+24
; E.g:
; LET S=_SOBAS_ REM (_SOBAS_ is TB start)
; LET B=_ARRAY_SIZE_+2 (_ARRAY_SIZE_ is the size of 2-dim array)
; Get byte from location V(I,J), store in Z.
; LET Z=USR(S+20,V+B*I+J,0)
; Store Z in location V(I,J)
; LET Z=USR(S+24,V+B*I+J,Z)
; From TB documentation:
; For your convenience two subroutines have been included in the TINY BASIC interpreter to access memory.
; If S contains the address of the beginning of the TINY BASIC interpreter (256 for standard 6800, 512
; for standard 6502, etc.), then location S+20 (hex 0114) is the entry point of a subroutine to read one
; byte from the memory address in the index register, and location S+24 (hex 0118) is the entry point of
; a subroutine to store one byte into memory.
;-------------------------------------------------
; USR (address)
; USR (address,Xreg)
; USR (address,Xreg,Areg)
;
; This function is actually a machine-language subroutine call to the address in the first argument.
; If the second argument is included the index registers contain that value on entry to the subroutine,
; with the most significant part in X. If the third argument is included, the accumulators contain that
; value on entry to the subroutine, with the least significant part in A. On exit, the value in the
; Accumulators (for the 6800; A and Y for the 6502) becomes the value of the function, with the least
; significant part in A. All three arguments are evaluated as normal expressions.
; It should be noted that machine language subroutine addresses are 16-bit Binary numbers. TINY BASIC
; evaluates all expressions to 16-bit binary numbers, so any valid expression may be used to define a
; subroutine address. However, most addresses are expressed in hexadecimal whereas TINY BASIC only accepts
; numerical constants in decimal. Thus to jump to a subroutine at hex address 40AF, you must code USR(16559).
; Hex address FFB5 is similarly 65461 in decimal, though the equivalent (-75) may be easier to use.
;
OneBytePeek:
stx $C3 ; read one byte from memory address in the index register
bcc LBL008
OneBytePoke:
stx $C3 ; store one byte into memory
sta (C_C2),Y
rts
LBL008: lda (C_C2),Y
ldy #$00
rts
; These seem to be addresses associated with the IL branch instructions
;.byte $62,$15, $64,$15, $D8,$15, $05,$16, $33,$16, $FD,$15
.byte <JUMP01,>JUMP01
.byte <LBL027,>LBL027
.byte <JUMP02,>JUMP02
.byte <JUMP03,>JUMP03
.byte <JUMP04,>JUMP04
.byte <JUMP05,>JUMP05
; NOTE: The original comment below is obsolete now, since I found the jump
; addresses locations and put them in this table. Now assembler will
; take care of the reallocation.
; START OF ORIGINAL COMMENT
; This appears to be a table of
; execution addresses to jump to ML routines
; that handle the the IL instructions.
; You cannot add code to or relocate this program
; without updating these
; END OF ORIGINAL COMMENT
;.byte $9F,$17, $42,$1B, $3F,$1B, $7A,$17, $FC,$18, $95,$17, $9F,$17, $9F,$17
.byte <LBL067,>LBL067
.byte <LBL132,>LBL132
.byte <JUMP06,>JUMP06
.byte <JUMP07,>JUMP07
.byte <LBL035,>LBL035
.byte <LBL097,>LBL097
.byte <LBL067,>LBL067
.byte <LBL067,>LBL067
;.byte $BD,$1A, $C1,$1A, $8A,$1A, $9B,$1A, $E9,$1A, $61,$17, $51,$17, $41,$1A
.byte <JUMP08,>JUMP08
.byte <JUMP09,>JUMP09
.byte <JUMP10,>JUMP10
.byte <JUMP11,>JUMP11
.byte <JUMP12,>JUMP12
.byte <JUMP13,>JUMP13
.byte <JUMP14,>JUMP14
.byte <LBL071,>LBL071
;.byte $52,$1A, $4F,$1A, $62,$1A, $E7,$19, $CD,$16, $06,$17, $9F,$17, $15,$18
.byte <JUMP15,>JUMP15
.byte <JUMP16,>JUMP16
.byte <JUMP17,>JUMP17
.byte <JUMP18,>JUMP18
.byte <JUMP19,>JUMP19
.byte <JUMP20,>JUMP20
.byte <LBL067,>LBL067
.byte <JUMP21,>JUMP21
;.byte $A7,$17, $B7,$16, $BF,$16, $83,$18, $A1,$16, $9F,$17, $9F,$17, $A8,$18
.byte <JUMP22,>JUMP22
.byte <JUMP23,>JUMP23
.byte <LBL047,>LBL047
.byte <LBL081,>LBL081
.byte <LBL013,>LBL013
.byte <LBL067,>LBL067
.byte <LBL067,>LBL067
.byte <JUMP24,>JUMP24
;.byte $4F,$1B, $4D,$1B, $07,$19, $AA,$14, $37,$17, $BD,$14, $1B,$1B, $B1,$1A
.byte <JUMP25,>JUMP25
.byte <JUMP26,>JUMP26
.byte <JUMP27,>JUMP27
.byte <MEM_T2,>MEM_T2
.byte <JUMP28,>JUMP28
.byte <WARM_S,>WARM_S
.byte <JUMP29,>JUMP29
.byte <JUMP30,>JUMP30
.byte $20,$41, $54,$20 ; No idea ????
.byte $80 ; No idea
LBL002: .byte <ILTBL ;$70 ; $70 - lo byte of IL address
LBL003: .byte >ILTBL ;$1B ; $1B - hi byte of IL address
;
;Begin Cold Start
;
;
;
; Load start of free ram ($1C00) into locations $0020 and $0022
; The memory between $1000 and $1Bff (3 kB) is free for assembler programs
; that can be loaded and used simultaneously with TB.
; $1C00 to the end of writable memory is the BASIC memory space.
;
COLD_S: lda #$00 ; Load accumulator with lo byte of lower and upper prg memory limits
sta $20 ; Store in $20
sta $22 ; Store in $22
lda #$1C ; Load accumulator with hi byte of lower and upper prg memory limits
sta $21 ; Store in $21
sta $23 ; Store in $23
; NOTE: $22,$23 vector will be updated by routine below to be the upper RAM limit for TB.
;
;
; Begin test for free ram
; As a result, memory locations $20,$21 will contain lo,hi byte order address of lower RAM boundary
; and $22,$23 upper RAM boundary respectively.
;
ldy #$01 ; Load register Y with $01
MEM_T: lda (C_22),Y ; Load accumulator With the contents of a byte of memory
tax ; Save it to X
eor #$FF ; Next 4 instuctions test to see if this memeory location
sta (C_22),Y ; is ram by trying to write something new to it - new value
cmp (C_22),Y ; gets created by XORing the old value with $FF - store the
php ; result of the test on the stack to look at later
txa ; Retrieve the old memory value
sta (C_22),Y ; Put it back where it came from
inc $22 ; Increment $22 (for next memory location)
bne SKP_PI ; Goto $14A6 if we don't need to increment page
inc $23 ; Increment $23 (for next memory page)
SKP_PI: plp ; Now look at the result of the memory test
beq MEM_T ; Go test the next mempry location if the last one was ram
dey ; If last memory location did not test as ram, decrement Y (should be $00 now)
MEM_T2: cld ; Make sure we're not in decimal mode
lda $20 ; Load up the low-order by of the start of free ram
adc SSS ; Add to the spare stack size
sta $24 ; Store the result in $0024
tya ; Retrieve Y
adc $21 ; And add it to the high order byte of the start of free ram (this does not look right)
sta $25 ; Store the result in $0025
tya ; Retrieve Y again
sta (C_20),Y ; Store A in the first byte of program memory
iny ; Increment Y
sta (C_20),Y ; Store A in the second byte of program memory
;
;Begin Warm Start;
;
WARM_S: lda $22
sta $C6
sta $26
lda $23
sta $C7
sta $27
jsr LBL001 ; Go print CR, LF and pad charachters
LBL014: lda LBL002
sta $2A
lda LBL003
sta $2B
lda #$80
sta $C1
lda #$30
sta $C0
ldx #$00
stx $BE
stx $C2
dex
txs
LBL006: cld
jsr LBL004 ; Go read a byte from the TBIL table
jsr LBL005
jmp LBL006
;
;
;
.byte $83 ; No idea about this
.byte $65 ; No idea about this
;
;
; Routine to service the TBIL Instructions
;
LBL005: cmp #$30 ;
bcs LBL011 ; If it's $30 or higher, it's a Branch or Jump - go handle it
cmp #$08 ;
bcc LBL007 ; If it's less than $08 it's a stack exchange - go handle it
asl ; Multiply the OP code by 2
tax ; Transfer it to X
LBL022: lda SR_V_H,X ; Get the hi byte of the OP Code handling routine
pha ; and save it on the stack
lda SR_V_L,X ; Get the lo byte
pha ; and save it on the stack
php ; save the processor status too
rti ; now go execute the OP Code handling routine
;
;
; Routine to handle the stack exchange
;
LBL007: adc $C1
tax
lda (C_C1),Y
pha
lda $00,X
sta (C_C1),Y
pla
sta $00,X
rts
;
;
;
LBL015: jsr LBL001 ; Go print CR, LF and pad charachters
lda #$21 ; Load an ASCII DC2
jsr OUT_V ; Go print it
lda $2A ; Load the current TBIL pointer (lo)
sec ; Set the carry flag
sbc LBL002 ; Subtract the TBIL table origin (lo)
tax ; Move the difference to X
lda $2B ; Load the current TBIL pointer (hi)
sbc LBL003 ; Subtract the TBIL table origin (hi)
jsr LBL010
lda $BE
beq LBL012
lda #$7E
sta $2A
lda #$20
sta $2B
jsr LBL013
ldx $28
lda $29
jsr LBL010
LBL012: lda #$07 ; ASCII Bell
jsr OUT_V ; Go ring Bell
jsr LBL001 ; Go print CR, LF and pad charachters
LBL060: lda $26
sta $C6
lda $27
sta $C7
jmp LBL014
;
;
;
LBL115: ldx #$7C
LBL048: cpx $C1
LBL019: bcc LBL015
ldx $C1
inc $C1
inc $C1
clc
rts
;
;
;
JUMP01: dec $BD
LBL027: lda $BD
beq LBL015
LBL017: lda $BC
sta $2A
lda $BD
sta $2B
rts
;
; Branch handling routine
;
LBL011: cmp #$40 ;
bcs LBL016 ; If it's not a Jump, go to branch handler
pha
jsr LBL004 ; Go read a byte from the TBIL table
adc LBL002
sta $BC
pla
pha
and #$07
adc LBL003
sta $BD
pla
and #$08
bne LBL017
lda $BC
ldx $2A
sta $2A
stx $BC
lda $BD
ldx $2B
sta $2B
stx $BD
LBL126: lda $C6
sbc #$01
sta $C6
bcs LBL018
dec $C7
LBL018: cmp $24
lda $C7
sbc $25
bcc LBL019
lda $BC
sta (C_C6),Y
iny
lda $BD
sta (C_C6),Y
rts
;
;Branch handler
;
LBL016: pha
lsr
lsr
lsr
lsr
and #$0E
tax
pla
cmp #$60
and #$1F
bcs LBL020
ora #$E0
LBL020: clc
beq LBL021
adc $2A
sta $BC
tya
adc $2B
LBL021: sta $BD
JMP LBL022
;
;
;
JUMP02: lda $2C
sta $B8
lda $2D
sta $B9
LBL025: jsr LBL023
jsr LBL024
eor (C_2A),Y
tax
jsr LBL004 ; Go read a byte from the TBIL table
txa
beq LBL025
asl
beq LBL026
lda $B8
sta $2C
lda $B9
sta $2D
LBL028: jmp LBL027
JUMP05: jsr LBL023
cmp #$0D
bne LBL028
LBL026: rts
;
;
;
JUMP03: jsr LBL023
cmp #$5B
bcs LBL028
cmp #$41
bcc LBL028
asl
jsr LBL029
LBL024: ldy #$00
lda (C_2C),Y
inc $2C
bne LBL030
inc $2D
LBL030: cmp #$0D
clc
rts
;
;
LBL031: jsr LBL024
LBL023: lda (C_2C),Y
cmp #$20
beq LBL031
cmp #$3A
clc
bpl LBL032
cmp #$30
LBL032: rts
;
;
;
JUMP04: jsr LBL023
bcc LBL028
sty $BC
sty $BD
LBL033: lda $BC
ldx $BD
asl $BC
rol $BD
asl $BC
rol $BD
clc
adc $BC
sta $BC
txa
adc $BD
asl $BC
rol
sta $BD
jsr LBL024
and #$0F
adc $BC
sta $BC
tya
adc $BD
sta $BD
jsr LBL023
bcs LBL033
jmp LBL034
LBL061: jsr LBL035
lda $BC
ora $BD
beq LBL036
LBL065: lda $20
sta $2C
lda $21
sta $2D
LBL040: jsr LBL037
beq LBL038
lda $28
cmp $BC
lda $29
sbc $BD
bcs LBL038
LBL039: jsr LBL024
bne LBL039
jmp LBL040
LBL038: lda $28
eor $BC
bne LBL041
lda $29
eor $BD
LBL041: rts
;
;
;
LBL043: jsr LBL042
LBL013: jsr LBL004 ; Entry point for TBIL PC (print literal) - Go read a byte from the TBIL table
bpl LBL043 ;
LBL042: inc $BF
bmi LBL044
jmp OUT_V ; Go print it
LBL044: dec $BF
LBL045: rts
;
;
;
LBL046: cmp #$22
beq LBL045
jsr LBL042
JUMP23: jsr LBL024
bne LBL046
LBL036: jmp LBL015
LBL047: lda #$20
jsr LBL042
lda $BF
and #$87
bmi LBL045
bne LBL047
rts
;
;
;
JUMP19: ldx #$7B
jsr LBL048
inc $C1
inc $C1
inc $C1
sec
lda $03,X
sbc $00,X
sta $00,X
lda $04,X
sbc $01,X
bvc LBL052
eor #$80
ora #$01
LBL052: bmi LBL053
bne LBL054
ora $00,X
beq LBL049
LBL054: lsr $02,X
LBL049: lsr $02,X
LBL053: lsr $02,X
bcc LBL050
LBL004: ldy #$00 ; Read a byte from the TBIL Table
lda (C_2A),Y ;
inc $2A ; Increment TBIL Table pointer as required
bne LBL051 ;
inc $2B ;
LBL051: ora #$00 ; Check for $00 and set the 'Z' flag acordingly
LBL050: rts ; Return
;
;
;
JUMP20: lda $BE
beq LBL055
LBL056: jsr LBL024
bne LBL056
jsr LBL037
beq LBL057
LBL062: jsr LBL058
jsr BREAK
bcs LBL059
lda $C4
sta $2A
lda $C5
sta $2B
rts
;
;
;
LBL059: lda LBL002
sta $2A
lda LBL003
sta $2B
LBL057: jmp LBL015
LBL055: sta $BF
jmp LBL060
JUMP28: lda $20
sta $2C
lda $21
sta $2D
jsr LBL037
beq LBL057
lda $2A
sta $C4
lda $2B
sta $C5
LBL058: lda #$01
sta $BE
rts
;
;
;
JUMP14: jsr LBL061
beq LBL062
LBL066: lda $BC
sta $28
lda $BD
sta $29
jmp LBL015
JUMP13: jsr LBL063
jsr LBL064
jsr LBL065
bne LBL066
rts
;
;
;
LBL037: jsr LBL024
sta $28
jsr LBL024
sta $29
ora $28
rts
;
;
;
JUMP07: jsr LBL035
jsr LBL034
LBL034: lda $BD
LBL131: jsr LBL029
lda $BC
LBL029: ldx $C1
dex
sta $00,X
stx $C1
cpx $C0
bne LBL067
LBL068: jmp LBL015
LBL097: ldx $C1
cpx #$80
bpl LBL068
lda $00,X
inc $C1
LBL067: rts
;
;
;
LBL010: sta $BD
stx $BC
jmp LBL069
JUMP22: ldx $C1 ; entry point to TBIL PN (print number)
lda $01,X
bpl LBL070
jsr LBL071
lda #$2D
jsr LBL042
LBL070: jsr LBL035
LBL069: lda #$1F
sta $B8
sta $BA
lda #$2A
sta $B9
sta $BB
ldx $BC
ldy $BD
sec
LBL072: inc $B8
txa
sbc #$10
tax
tya
sbc #$27
tay
bcs LBL072
LBL073: dec $B9
txa
adc #$E8
tax
tya
adc #$03
tay
bcc LBL073
txa
LBL074: sec
inc $BA
sbc #$64
bcs LBL074
dey
bpl LBL074
LBL075: dec $BB
adc #$0A
bcc LBL075
ora #$30
sta $BC
lda #$20
sta $BD
ldx #$FB
LBL199: stx $C3
lda $BD,X
ora $BD
cmp #$20
beq LBL076
ldy #$30
sty $BD
ora $BD
jsr LBL042
LBL076: ldx $C3
inx
bne LBL199
rts
;
;
;
JUMP21: lda $2D
pha
lda $2C
pha
lda $20
sta $2C
lda $21
sta $2D
lda $24
ldx $25
jsr LBL077
beq LBL078
jsr LBL077
LBL078: lda $2C
sec
sbc $B6
lda $2D
sbc $B7
bcs LBL079
jsr LBL037
beq LBL079
ldx $28
lda $29
jsr LBL010
lda #$20
LBL080: jsr LBL042
jsr BREAK
bcs LBL079
jsr LBL024
bne LBL080
jsr LBL081
jmp LBL078
LBL077: sta $B6
inc $B6
bne LBL082
inx
LBL082: stx $B7
ldy $C1
cpy #$80
beq LBL083
jsr LBL061
LBL099: lda $2C
ldx $2D
sec
sbc #$02
bcs LBL084
dex
LBL084: sta $2C
jmp LBL085
LBL079: pla
sta $2C
pla
sta $2D
LBL083: rts
LBL081: lda $BF
bmi LBL083
;
;
; Routine to handle CR, LF and pad characters in the ouput
;
LBL001: lda #$0D ; Load up a CR
jsr OUT_V ; Go print it
lda PCC ; Load the pad character code
and #$7F ; Test to see -
sta $BF ; how many pad charachters to print
beq LBL086 ; Skip if 0
LBL088: jsr LBL087 ; Go print pad charcter
dec $BF ; One less
bne LBL088 ; Loop until 0
LBL086: lda #$0A ; Load up a LF
jmp LBL089 ; Go print it
;
;
;
LBL092: ldy TMC
LBL091: sty $BF
bcs LBL090
JUMP24: lda #$30 ; Entry pont for TBIL GL (get input line)
sta $2C
sta $C0
sty $2D
jsr LBL034
LBL090: eor $80
sta $80
jsr IN_V
ldy #$00
ldx $C0
and #$7F
beq LBL090
cmp #$7F
beq LBL090
cmp #$13
beq LBL091
cmp #$0A
beq LBL092
cmp LSC
beq LBL093
cmp BSC
bne LBL094
cpx #$30
bne LBL095
LBL093: ldx $2C
sty $BF
lda #$0D
LBL094: cpx $C1
bmi LBL096
lda #$07
jsr LBL042
jmp LBL090
LBL096: sta $00,X
inx
inx
LBL095: dex
stx $C0
cmp #$0D
bne LBL090
jsr LBL081
LBL035: jsr LBL097
sta $BC
jsr LBL097
sta $BD
rts
;
;
;
JUMP27: jsr LBL098
jsr LBL061
php
jsr LBL099
sta $B8
stx $B9
lda $BC
sta $B6
lda $BD
sta $B7
ldx #$00
plp
bne LBL100
jsr LBL037
dex
dex
LBL101: dex
jsr LBL024
bne LBL101
LBL100: sty $28
sty $29
jsr LBL098
lda #$0D
cmp (C_2C),Y
beq LBL102
inx
inx
inx
LBL103: inx
iny
cmp (C_2C),Y
bne LBL103
lda $B6
sta $28
lda $B7
sta $29
LBL102: lda $B8
sta $BC
lda $B9
sta $BD
clc
ldy #$00
txa
beq LBL104
bpl LBL105
adc $2E
sta $B8
lda $2F
sbc #$00
sta $B9
LBL109: lda (C_2E),Y
sta (C_B8),Y
ldx $2E
cpx $24
bne LBL106
lda $2F
cmp $25
beq LBL107
LBL106: inx
stx $2E
bne LBL108
inc $2F
LBL108: inc $B8
bne LBL109
inc $B9
bne LBL109
LBL105: adc $24
sta $B8
sta $2E
tya
adc $25
sta $B9
sta $2F
lda $2E
sbc $C6
lda $2F
sbc $C7
bcc LBL110
dec $2A
jmp LBL015
LBL110: lda (C_24),Y
sta (C_2E),Y
ldx $24
bne LBL111
dec $25
LBL111: dec $24