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Arakon

Robert Garcia's Butler
Joined
Apr 5, 2001
Posts
1,280
it's simply the second BIOS added to switch between US/Jap.
 
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Winston Goh

Camel Slug
Joined
Dec 5, 2001
Posts
508
Originally posted by Arakon:
<strong>it's simply the second BIOS added to switch between US/Jap.</strong><hr></blockquote>

Do you mean piggy back the debug bios on top of the original bios? But how do I switch between them?
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A

Arakon

Robert Garcia's Butler
Joined
Apr 5, 2001
Posts
1,280
with a DPDT switch.. pin 20 is output enable, if it's connected to +5V, the chip is disabled (actually its output), if it's connected to the original spot on the PCB, it's active. you basically switch one to +5V, the other to the original spot, and vice versa. both pins have to be lifted when doing the piggyback mod. it doesn't have to be the debug bios, btw.. it doesn't work properly in MVS units, for example, the very same works with a normal bios too.. i.e. adding a japanese home bios to an US MVS.
 
W

Winston Goh

Camel Slug
Joined
Dec 5, 2001
Posts
508
Originally posted by Arakon:
<strong>with a DPDT switch.. pin 20 is output enable, if it's connected to +5V, the chip is disabled (actually its output), if it's connected to the original spot on the PCB, it's active. you basically switch one to +5V, the other to the original spot, and vice versa. both pins have to be lifted when doing the piggyback mod. it doesn't have to be the debug bios, btw.. it doesn't work properly in MVS units, for example, the very same works with a normal bios too.. i.e. adding a japanese home bios to an US MVS.</strong><hr></blockquote>

Thank!
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