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/  Forum Index
   /  Classic Amiga Hardware
      /  Amiga 500Plus U12
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PosterThread
scuzz 
Amiga 500Plus U12
Posted on 22-May-2020 22:49:35
#1 ]
Regular Member
Joined: 30-May-2004
Posts: 346
From: New Forest United Kingdom

Hi

It is strange that in most A500Plus computers the battery has chosen to attack component U12 and the adjacent resistor. I can appreciate the resistor cus the legs are so close to the battery end but often only the U12 has been hammered and everything else is generally OK. I guess there is good reason. Don't even know what U12 does.. perhaps someone here knows.

https://www.scuzzscink.com/amiga/scuzzblog_may20_2/car_sbd_190520_28.jpg

https://www.scuzzscink.com/amiga/scuzzblog_may20_2/car_sbd_190520_29.jpg

https://www.scuzzscink.com/amiga/scuzzblog_may20_2/car_sbd_190520_27.jpg

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tonyw 
Re: Amiga 500Plus U12
Posted on 23-May-2020 1:07:01
#2 ]
Elite Member
Joined: 8-Mar-2003
Posts: 3194
From: Sydney (of course)

@scuzz

According to my old manual for the A500 (not the Plus), U12 is just an octal buffer between the CPU and the internal video bus. In the A500 it was a 74F244, but I see in the Plus it is a 74LS244 (lower power).

It's a pretty bog standard chip that you can buy at any tech store and replace yourself if you can solder and desolder.

_________________
cheers
tony

Hyperion Support Forum: http://forum.hyperion-entertainment.biz/index.php

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