NEO-E0

Package	QFP64R
Manufacturer
First use	1991 ?
Used on	NEO-AES3-3 ...

68k vector table swapping

The 68k vector table is swapped with the System ROM one by using REG_SWPBIOS or REG_SWPROM.

A22I~A23I are used to make the address appear to address decoding chips as a system ROM access instead of a P ROM access.

Address	Maps to
	VEC = 0	VEC = 1
$000000~$0000FF	$C00000~$C000FF	$000000~$0000FF
$000100~$BFFFFF	$000100~$BFFFFF
$C00000~$C000FF	$000000~$0000FF	$C00000~$C000FF
$C00100~$FFFFFF	$C00100~$FFFFFF

User:Kyuusaku: {A23Z,A22Z} = A[23:22] ^ 2{~|{A[21:7],^A[23:22],VEC}}

Pinouts

On the AES, the AND gate is used to get /SROMOE from /SROMOEL AND /SROMOEU.

MV2B @ H7 pinout

55 = sPCK1B 56 = sPCK2B

MV2B @ G2 pinout

OpenOffice Draw file: File:Neo-e0 mv2b G2.odg

A1~A23: 68k address bus MCA0~MCA23: memory card address bus BNK0~BNK2: memory card banking from NEO-D0 VEC: System ROM vector table swapping enable

MV2B @ F7 pinout

OpenOffice Draw file: File:Neo-e0 mv2b F7.odg

Acts just as a buffer. s*: signals to both slots

?

OpenOffice Draw file: File:Neo-e0.odg

A1~A23: 68k address bus Y0~Y23: memory card address bus BNK0~BNK2: comes from NEO-D0, memory card banking VEC: System ROM vector table swapping enable ANI0, ANI1, AND0: AND gate used to generate ROMOE from ROMOEU and ROMOEL