I now have an HP-87 thanks to @KevinSavetz ! Needs some cleaning but its basic (and BASIC) functions seem to work. Parts on order to try the serial port and a ROM expansion.
Emboldened by last weekend’s 128D cleaning and recognizing that this HP needs a bath before it can be used properly due to sticky keys, I took the plunge. Already found a few of these little pumpkin stickers, which I don’t think are stock.
Looks like six screws to get it open.
HP-87 exposed! That shock warning is no joke, by the way, this is a CRT with capacitors and the whole deal. Thankfully I don’t see a reason to delve further into the unit, for now.
Built-in ROM board on the side. Socketed!
- Intel P8049: HMOS 8-bit microcontroller
- 1MB5: bus translator
- 1MA8: I/O buffer
- 1MA7 59,58,82,56,71,72: system ROMs
- flip flops, bus transceivers, etc.
The good news is everything cleaned up very nicely. The less good news is the keys that were sticking were not doing so because of grime. In all cases I discovered a fracture at the corner of the white post that was adding friction. I WD-40’d the affected keys.🤞
All clean and looking gorgeous! Now to figure out how to use it.
(Originally posted to Twitter on March 31, 2019. It received 37 likes.)