Re: Flobynoid 9.8 crashes on boot...

[Michael J. Mahon <mjmahon@aol.com>]

BLuRry <brendan.robert@gmail.com> wrote:
> When I look at the trace, I see this prior to the loader crash:
> 
> A0 38 0C 01E3 ..RB..ZC  8b0 : STA $c00c
> A0 38 0C 01E3 ..RB..ZC  8b3 : STA $c000
> A0 38 0C 01E3 ..RB..ZC  8b6 : JMP $b600
> A0 38 0C 01E3 ..RB..ZC  b600 : BBS5 $a0,$R
> A0 38 0C 01E3 ..RB..ZC  b602 : LDY #$a0
> A0 38 A0 01E3 N.RB...C  b604 : LDY #$a0
> A0 38 A0 01E3 N.RB...C  b606 : LDY #$a0
> A0 38 A0 01E3 N.RB...C  b608 : LDY #$a0
> A0 38 A0 01E3 N.RB...C  b60a : LDY #$a0
> A0 38 A0 01E3 N.RB...C  b60c : LDY #$a0
> A0 38 A0 01E3 N.RB...C  b60e : LDY #$a0
> A0 38 A0 01E3 N.RB...C  b610 : ???
> A0 38 A0 01E3 N.RB...C  b611 : CMP $c3
> A0 38 A0 01E3 N.RB...C  b613 : BBS4 $ce,$R
> A0 38 A0 01E3 N.RB...C  b5d9 : ???
> A0 38 A0 01E3 N.RB...C  b5da : ADC $3173,Y
> F6 38 A0 01E3 N.RB....  b5dd : ROL $73,X
> F6 38 A0 01E3 ..RB....  b5df : AND $(36),Y
> 12 38 A0 01E3 ..RB....  b5e1 : BVS $b614
> 12 38 A0 01E3 ..RB....  b5e3 : BRK #$00
> BRK at $b5e5
> 
> Obviously BBS5 is not a valid opcode in this case -- so why would
> flobynoid jump to this address when there's no program code there?  I see
> it activate 80 col and 80 store prior to this -- I didn't munge the
> softswitch implementation for aux reads did I?
> 
> -B

Actually, a bank switching problem could easily cause such a symptom. 

-michael - NadaNet 3.1 and AppleCrate II: http://home.comcast.net/~mjmahon