| [hatari-devel] 2 little more questions |
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Hi,
In complement, I've noticed these 2 little differences :
NewCPU
00E01424 0838 0005 fa0b BTST.B #$0005,$fffffa0b
00E0142A 67f8 BEQ.B #$fffffffffffffff8 == $00E01424 (T)
00E01424 0838 0005 fa0b BTST.B #$0005,$fffffa0b
00E0142A 67f8 BEQ.B #$fffffffffffffff8 == $00E01424 (T)
00E01424 0838 0005 fa0b BTST.B #$0005,$fffffa0b
00E0142A 67f8 BEQ.B #$fffffffffffffff8 == $00E01424 (F)
00E0142C 4238 fa19 CLR.B $fffffa19
00E01430 4e75 RTS.L
OldCpu
$e01424 : 0838 0005 fa0b btst #5,$fffffa0b.w
$e0142a : 67f8 beq.s $e01424
$e01424 : 0838 0005 fa0b btst #5,$fffffa0b.w
$e0142a : 67f8 beq.s $e01424
$e01424 : 0838 0005 fa0b btst #5,$fffffa0b.w
$e0142a : 67f8 beq.s $e01424
$e01424 : 0838 0005 fa0b btst #5,$fffffa0b.w
$e0142a : 67f8 beq.s $e01424
$e0142c : 4238 fa19 clr.b $fffffa19.w
$e01430 : 4e75 rts
OldCpu tests once more the address $fffffa0b.w than the newCPU.
This happens at the instruction 677 025 after the boot of hatari.
(So the first 677 024 first instructions are identical (the loops included).
It's the first time that the 2 CPUs are doing different things.
(May it be only because of different CPU timings ?)
Last difference, at instruction 677 437:
NewCPU:
00E02CD6 21fc 00e0 2ce6 0008 MOVE.L #$00e02ce6,$00000008
00E02CDE 4a38 8e09 TST.B $ffff8e09
M68000 Bus Error reading at address $ff8e09.
00E02CE6 2e49 MOVEA.L A1,A7
00E02CE8 21ca 0008 MOVE.L A2,$00000008
OldCPU:
$e02cd6 : 21fc 00e0 2ce6 0008 move.l #$e02ce6,$0008.w
$e02cde : 4a38 8e09 tst.b $ffff8e09.w
$e02ce6 : 2e49 movea.l a1,sp
$e02ce8 : 21ca 0008 move.l a2,$0008.w
I haven't got the address error with the old CPU.
Any idea why it doesn't display illegal address with the old CPU ?
In hardware.txt, it's written: $FF8E09|byte |General purpose register -
does nothing |R/W (TT)
Regards
Laurent