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Irmen de Jong 2019-09-09 19:57:51 +02:00
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<project version="4">
<component name="VcsDirectoryMappings">
<mapping directory="$PROJECT_DIR$" vcs="Git" />
<mapping directory="$PROJECT_DIR$/sim65/test/6502_functional_tests" vcs="Git" />
</component>
</project>
</project>

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; Verify decimal mode behavior
; Written by Bruce Clark. This code is public domain.
; see http://www.6502.org/tutorials/decimal_mode.html
;
; Returns:
; ERROR = 0 if the test passed
; ERROR = 1 if the test failed
; modify the code at the DONE label for desired program end
;
; This routine requires 17 bytes of RAM -- 1 byte each for:
; AR, CF, DA, DNVZC, ERROR, HA, HNVZC, N1, N1H, N1L, N2, N2L, NF, VF, and ZF
; and 2 bytes for N2H
;
; Variables:
; N1 and N2 are the two numbers to be added or subtracted
; N1H, N1L, N2H, and N2L are the upper 4 bits and lower 4 bits of N1 and N2
; DA and DNVZC are the actual accumulator and flag results in decimal mode
; HA and HNVZC are the accumulator and flag results when N1 and N2 are
; added or subtracted using binary arithmetic
; AR, NF, VF, ZF, and CF are the predicted decimal mode accumulator and
; flag results, calculated using binary arithmetic
;
; This program takes approximately 1 minute at 1 MHz (a few seconds more on
; a 65C02 than a 6502 or 65816)
;
; Configuration:
cputype = 0 ; 0 = 6502, 1 = 65C02, 2 = 65C816
vld_bcd = 0 ; 0 = allow invalid bcd, 1 = valid bcd only
chk_a = 1 ; check accumulator
chk_n = 0 ; check sign (negative) flag
chk_v = 0 ; check overflow flag
chk_z = 0 ; check zero flag
chk_c = 1 ; check carry flag
end_of_test macro
db $db ;execute 65C02 stop instruction
endm
bss
org 0
; operands - register Y = carry in
N1 ds 1
N2 ds 1
; binary result
HA ds 1
HNVZC ds 1
;04
; decimal result
DA ds 1
DNVZC ds 1
; predicted results
AR ds 1
NF ds 1
;08
VF ds 1
ZF ds 1
CF ds 1
ERROR ds 1
;0C
; workspace
N1L ds 1
N1H ds 1
N2L ds 1
N2H ds 2
code
org $200
TEST ldy #1 ; initialize Y (used to loop through carry flag values)
sty ERROR ; store 1 in ERROR until the test passes
lda #0 ; initialize N1 and N2
sta N1
sta N2
LOOP1 lda N2 ; N2L = N2 & $0F
and #$0F ; [1] see text
if vld_bcd = 1
cmp #$0a
bcs NEXT2
endif
sta N2L
lda N2 ; N2H = N2 & $F0
and #$F0 ; [2] see text
if vld_bcd = 1
cmp #$a0
bcs NEXT2
endif
sta N2H
ora #$0F ; N2H+1 = (N2 & $F0) + $0F
sta N2H+1
LOOP2 lda N1 ; N1L = N1 & $0F
and #$0F ; [3] see text
if vld_bcd = 1
cmp #$0a
bcs NEXT1
endif
sta N1L
lda N1 ; N1H = N1 & $F0
and #$F0 ; [4] see text
if vld_bcd = 1
cmp #$a0
bcs NEXT1
endif
sta N1H
jsr ADD
jsr A6502
jsr COMPARE
bne DONE
jsr SUB
jsr S6502
jsr COMPARE
bne DONE
NEXT1 inc N1 ; [5] see text
bne LOOP2 ; loop through all 256 values of N1
NEXT2 inc N2 ; [6] see text
bne LOOP1 ; loop through all 256 values of N2
dey
bpl LOOP1 ; loop through both values of the carry flag
lda #0 ; test passed, so store 0 in ERROR
sta ERROR
DONE
end_of_test
; Calculate the actual decimal mode accumulator and flags, the accumulator
; and flag results when N1 is added to N2 using binary arithmetic, the
; predicted accumulator result, the predicted carry flag, and the predicted
; V flag
;
ADD sed ; decimal mode
cpy #1 ; set carry if Y = 1, clear carry if Y = 0
lda N1
adc N2
sta DA ; actual accumulator result in decimal mode
php
pla
sta DNVZC ; actual flags result in decimal mode
cld ; binary mode
cpy #1 ; set carry if Y = 1, clear carry if Y = 0
lda N1
adc N2
sta HA ; accumulator result of N1+N2 using binary arithmetic
php
pla
sta HNVZC ; flags result of N1+N2 using binary arithmetic
cpy #1
lda N1L
adc N2L
cmp #$0A
ldx #0
bcc A1
inx
adc #5 ; add 6 (carry is set)
and #$0F
sec
A1 ora N1H
;
; if N1L + N2L < $0A, then add N2 & $F0
; if N1L + N2L >= $0A, then add (N2 & $F0) + $0F + 1 (carry is set)
;
adc N2H,x
php
bcs A2
cmp #$A0
bcc A3
A2 adc #$5F ; add $60 (carry is set)
sec
A3 sta AR ; predicted accumulator result
php
pla
sta CF ; predicted carry result
pla
;
; note that all 8 bits of the P register are stored in VF
;
sta VF ; predicted V flags
rts
; Calculate the actual decimal mode accumulator and flags, and the
; accumulator and flag results when N2 is subtracted from N1 using binary
; arithmetic
;
SUB sed ; decimal mode
cpy #1 ; set carry if Y = 1, clear carry if Y = 0
lda N1
sbc N2
sta DA ; actual accumulator result in decimal mode
php
pla
sta DNVZC ; actual flags result in decimal mode
cld ; binary mode
cpy #1 ; set carry if Y = 1, clear carry if Y = 0
lda N1
sbc N2
sta HA ; accumulator result of N1-N2 using binary arithmetic
php
pla
sta HNVZC ; flags result of N1-N2 using binary arithmetic
rts
if cputype != 1
; Calculate the predicted SBC accumulator result for the 6502 and 65816
;
SUB1 cpy #1 ; set carry if Y = 1, clear carry if Y = 0
lda N1L
sbc N2L
ldx #0
bcs S11
inx
sbc #5 ; subtract 6 (carry is clear)
and #$0F
clc
S11 ora N1H
;
; if N1L - N2L >= 0, then subtract N2 & $F0
; if N1L - N2L < 0, then subtract (N2 & $F0) + $0F + 1 (carry is clear)
;
sbc N2H,x
bcs S12
sbc #$5F ; subtract $60 (carry is clear)
S12 sta AR
rts
endif
if cputype = 1
; Calculate the predicted SBC accumulator result for the 6502 and 65C02
;
SUB2 cpy #1 ; set carry if Y = 1, clear carry if Y = 0
lda N1L
sbc N2L
ldx #0
bcs S21
inx
and #$0F
clc
S21 ora N1H
;
; if N1L - N2L >= 0, then subtract N2 & $F0
; if N1L - N2L < 0, then subtract (N2 & $F0) + $0F + 1 (carry is clear)
;
sbc N2H,x
bcs S22
sbc #$5F ; subtract $60 (carry is clear)
S22 cpx #0
beq S23
sbc #6
S23 sta AR ; predicted accumulator result
rts
endif
; Compare accumulator actual results to predicted results
;
; Return:
; Z flag = 1 (BEQ branch) if same
; Z flag = 0 (BNE branch) if different
;
COMPARE
if chk_a = 1
lda DA
cmp AR
bne C1
endif
if chk_n = 1
lda DNVZC ; [7] see text
eor NF
and #$80 ; mask off N flag
bne C1
endif
if chk_v = 1
lda DNVZC ; [8] see text
eor VF
and #$40 ; mask off V flag
bne C1 ; [9] see text
endif
if chk_z = 1
lda DNVZC
eor ZF ; mask off Z flag
and #2
bne C1 ; [10] see text
endif
if chk_c = 1
lda DNVZC
eor CF
and #1 ; mask off C flag
endif
C1 rts
; These routines store the predicted values for ADC and SBC for the 6502,
; 65C02, and 65816 in AR, CF, NF, VF, and ZF
if cputype = 0
A6502 lda VF ; 6502
;
; since all 8 bits of the P register were stored in VF, bit 7 of VF contains
; the N flag for NF
;
sta NF
lda HNVZC
sta ZF
rts
S6502 jsr SUB1
lda HNVZC
sta NF
sta VF
sta ZF
sta CF
rts
endif
if cputype = 1
A6502 lda AR ; 65C02
php
pla
sta NF
sta ZF
rts
S6502 jsr SUB2
lda AR
php
pla
sta NF
sta ZF
lda HNVZC
sta VF
sta CF
rts
endif
if cputype = 2
A6502 lda AR ; 65C816
php
pla
sta NF
sta ZF
rts
S6502 jsr SUB1
lda AR
php
pla
sta NF
sta ZF
lda HNVZC
sta VF
sta CF
rts
endif
end TEST

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25
sim65/test/6502_functional_tests/readme.txt Normal file
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This is a set of functional tests for the 6502/65C02 type processors.
The 6502_functional_test.a65 is an assembler sourcecode to test all valid
opcodes and addressing modes of the original NMOS 6502 cpu.
The 65C02_extended_opcodes_test.a65c tests all additional opcodes of the
65C02 processor including undefined opcodes.
The 6502_interrupt_test.a65 is a simple test to check the interrupt system
of both processors. A feedback register is required to inject IRQ and NMI
requests.
Detailed information about how to configure, assemble and run the tests is
included in each source file.
The tests have primarily been written to test my own ATMega16 6502 emulator
project. You can find it here: http://2m5.de/6502_Emu/index.htm
A discussion about the tests can be found here:
http://forum.6502.org/viewtopic.php?f=2&t=2241
Good luck debugging your emulator, simulator, fpga core, discrete
logic implementation or whatever you have!

220
sim65/test/6502_functional_tests/report.i65 Normal file
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;**** report 6502 funtional test errors to standard I/O ****
;
;this include file is part of the 6502 functional tests
;it is used when you configure report = 1 in the tests
;
;to adopt the standard output vectors of your test environment
;you must modify the rchar and rget subroutines in this include
;
;I/O hardware may have to be initialized in report_init
;print message macro - \1 = message location
rprt macro
ldx #0
lda \1
loop\?
jsr rchar
inx
lda \1,x
bne loop\?
endm
;initialize I/O as required (example: configure & enable ACIA)
report_init
;nothing to initialize
rprt rmsg_start
rts
;show stack (with saved registers), zeropage and absolute memory workspace
;after an error was trapped in the test program
report_error
;save registers
php
pha
txa
pha
tya
pha
cld
;show stack with index to registers at error
rprt rmsg_stack
tsx
inx
lda #1 ;address high
jsr rhex
txa ;address low
jsr rhex
rstack jsr rspace
lda $100,x ;stack data
jsr rhex
inx
bne rstack
jsr rcrlf ;new line
;show zero page workspace
lda #0
jsr rhex
lda #zpt
tax
jsr rhex
rzp jsr rspace
lda 0,x
jsr rhex
inx
cpx #zp_bss
bne rzp
jsr rcrlf
;show absolute workspace
lda #hi(data_segment)
jsr rhex
lda #lo(data_segment)
jsr rhex
ldx #0
rabs jsr rspace
lda data_segment,x
jsr rhex
inx
cpx #(data_bss-data_segment)
bne rabs
;ask to continue
rprt rmsg_cont
rerr1 jsr rget
cmp #'S'
beq rskip
cmp #'C'
bne rerr1
;restore registers
pla
tay
pla
tax
pla
plp
rts
;skip the current test
rskip lda #$f0 ;already end of tests?
cmp test_case
beq rerr1 ;skip is not available
ldx #$ff ;clear stack
txs
inc test_case ;next test
lda #lo(start) ;find begin of test
sta zpt
lda #hi(start)
sta zpt+1
rskipl1 ldy #4 ;search pattern
rskipl2 lda (zpt),y ;next byte
cmp rmark,y
bne rskipnx ;no match
dey
bmi rskipf ;found pattern
cpy #1 ;skip immediate value
bne rskipl2
dey
beq rskipl2
rskipnx inc zpt ;next RAM location
bne rskipl1
inc zpt+1
bne rskipl1
rskipf ldy #1 ;pattern found - check test number
lda (zpt),y ;test number
cmp #$f0 ;end of last test?
beq rskipe ;ask to rerun all
cmp test_case ;is next test?
bne rskipnx ;continue searching
rskipe jmp (zpt) ;start next test or rerun at end of tests
rmark lda #0 ;begin of test search pattern
sta test_case
;show test has ended, ask to repeat
report_success
if rep_int = 1
rprt rmsg_priority
lda data_segment ;show interrupt sequence
jsr rhex
jsr rspace
lda data_segment+1
jsr rhex
jsr rspace
lda data_segment+2
jsr rhex
endif
rprt rmsg_success
rsuc1 jsr rget
cmp #'R'
bne rsuc1
rts
;input subroutine
;get a character from standard input
;adjust according to the needs in your test environment
rget ;get character in A
;rget1
; lda $bff1 ;wait RDRF
; and #8
; beq rget1
;not a real ACIA - so RDRF is not checked
; lda $bff0 ;read acia rx reg
lda $f004 ;Kowalski simulator default
;the load can be replaced by a call to a kernal routine
; jsr $ffcf ;example: CHRIN for a C64
cmp #'a' ;lower case
bcc rget1
and #$5f ;convert to upper case
rget1 rts
;output subroutines
rcrlf lda #10
jsr rchar
lda #13
bne rchar
rspace lda #' '
bne rchar
rhex pha ;report hex byte in A
lsr a ;high nibble first
lsr a
lsr a
lsr a
jsr rnib
pla ;now low nibble
and #$f
rnib clc ;report nibble in A
adc #'0' ;make printable 0-9
cmp #'9'+1
bcc rchar
adc #6 ;make printable A-F
;send a character to standard output
;adjust according to the needs in your test environment
;register X needs to be preserved!
rchar ;report character in A
; pha ;wait TDRF
;rchar1 lda $bff1
; and #$10
; beq rchar1
; pla
;not a real ACIA - so TDRF is not checked
; sta $bff0 ;write acia tx reg
sta $f001 ;Kowalski simulator default
;the store can be replaced by a call to a kernal routine
; jsr $ffd2 ;example: CHROUT for a C64
rts
rmsg_start
db 10,13,"Started testing",10,13,0
rmsg_stack
db 10,13,"regs Y X A PS PCLPCH",10,13,0
rmsg_cont
db 10,13,"press C to continue or S to skip current test",10,13,0
rmsg_success
db 10,13,"All tests completed, press R to repeat",10,13,0
if rep_int = 1
rmsg_priority
db 10,13,"interrupt sequence (NMI IRQ BRK) ",0
endif