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PCB pictures of a HP10B, HP20S or HP21S?
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Post: #3
12-17-2012, 03:12 PM
 Hi, I'm looking for pictures of both sides of the PCB from a HP10B or HP20S or HP21S calculator (Low Range Pioneer with LU7 Bert chip). I expect that all 3 calculator use the same PCB so IMHO it doesn't matter from which one the pictures are. Christoph ▼
Post: #4
12-17-2012, 10:19 PM
There were different boards. First is a 20S (1LU7-0303), Serial 3125S... Later, they changed the packaging which IIRC matched the 12C chip package. That version is a 10B (1LU7-0006), Serial ID922... Neither board shown has any plate-throughs. Earlier versions used tab packages with the typical HP gold plate double sided plate throughs, same as the early Pioneer 17/27/42S type. If you want the full size images, shoot me a message, they are too big to post with the user account here.
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