Super Tetris 2 & Bombliss Genteiban (J) is a real case limit open bus behaviour inside the IRQ routine:

00816D: INC $0320
008170: LDA $1fff ;word access read memories 0x1fff and 0x2000, 0x2000 is open bus and should return 0x00 instead of current 0x1f
008173: BEQ 008187 ($12) ;must jump there

Wizardry Gaiden IV - Taima no Kodou:


008023: XCE
008024: SEP #$20
008026: REP #$10
008028: LDX #$1fff
00802B: TXS
00802C: REP #$20
00802E: LDA $7e1b0d
008032: CMP #$6421 ;reads 0x7e1b0d without setting it and expects to be equal to 0x6421 otherwise it dies
008035: BNE 008049 ($12)


Guess that this is a very clear case of SRAM flaw?

Last edited by Kale; 04/11/10 03:56 PM. Reason: Wizardry Gaiden IV - Taima no Kodou info