Opinion on installing unibios
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gamejunkie
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You mean the unibios chip soldered straight on top of the regular chip? If so...you could cut the Vcc leg of the original bios chip, then run that through a double-position single-throw switch, and then to each chips power lead leg.
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Yes you can install a unibios piggyback style like that if you wish. I would more suggest removing the old bios and solderig a socket though. You can also solder a socket on top of the original bios using the method you point out and then simply put the unibios directly into the socket. Doing it like that has the advantage of being able to easily remove the unibios for future upgrades.
Raz
Raz
TerryMathews
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You could also do the over-top method with a socket if you buy a ZIF socket. You'll rip a normal socket off the solder joints when you remove the EPROM, but a ZIF socket will just release it when you pull the lever.
A ZIF socket is probably 3x as expensive, but we're talking $9 instead of $3. Not a big deal considering the value and replacement cost of the parts you're dealing with.
A ZIF socket is probably 3x as expensive, but we're talking $9 instead of $3. Not a big deal considering the value and replacement cost of the parts you're dealing with.
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How's the ZIF socket look like?
TerryMathews said:You could also do the over-top method with a socket if you buy a ZIF socket. You'll rip a normal socket off the solder joints when you remove the EPROM, but a ZIF socket will just release it when you pull the lever.
A ZIF socket is probably 3x as expensive, but we're talking $9 instead of $3. Not a big deal considering the value and replacement cost of the parts you're dealing with.
gamejunkie
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Isn't a ZIF socket like what's used on pc's chip socket?
TerryMathews
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gamejunkie
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gamejunkie said:
That would be correct.
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The dimensions of ZIF sockets are an issue...
The fact is that ZIF sockets are definitely longer than normal sockets and this is a problem because on AES boards there are components in close proximity with the bios. A ZIF socket like this would not fit this AES board because of the cap and the Z80 to the left of the bios. Perhaps if you reverse the orientation of the ZIF (that is with the lever near the edge of the board) and remove the cap (and resolder it on solder side?) it *might* fit. On different AES revisions, however, the bios has components on both sides so that wouldn't work. There are ZIF sockets with a smaller body, like this, so if you really want to install a ZIF you should try this slimmer type and hope it'll fit... in any case note that normal sockets will wear out but only after many many insertions/extractions.
The fact is that ZIF sockets are definitely longer than normal sockets and this is a problem because on AES boards there are components in close proximity with the bios. A ZIF socket like this would not fit this AES board because of the cap and the Z80 to the left of the bios. Perhaps if you reverse the orientation of the ZIF (that is with the lever near the edge of the board) and remove the cap (and resolder it on solder side?) it *might* fit. On different AES revisions, however, the bios has components on both sides so that wouldn't work. There are ZIF sockets with a smaller body, like this, so if you really want to install a ZIF you should try this slimmer type and hope it'll fit... in any case note that normal sockets will wear out but only after many many insertions/extractions.