4:00 am dumpster dive

[spcake89]

Hey
Looks like you got one heck of a haul there im a dumpster diver as well dont find nearly that quality of stuff though unfortunately i do find my fair share of computer parts though but i take anything electronic i see just in case. again congrats on the beautiful find
sean

 

[jpdriver1]

please excuse the question by a newb, but do you break the boards down into smaller parts before using the acid?

 

[jimdoc]

please excuse the question by a newb, but do you break the boards down into smaller parts before using the acid?

I suggest you do a few weeks of reading on the forum, and Hoke's book before using the acid.
You may decide to sell your boards and just do the easy stuff.

Jim

 

[notch]

On the one that has gold legs it has a silver stripe running through it. Curious what that might be?

The top chips are standard 256K EPROMS with a 1994 date code. The bottom chips have proprietary numbers, so it's hard to tell what they are but they were made in the early to mid '80's.

 

[macfixer01]

On the one that has gold legs it has a silver stripe running through it. Curious what that might be?

The top chips are standard 256K EPROMS with a 1994 date code. The bottom chips have proprietary numbers, so it's hard to tell what they are but they were made in the early to mid '80's.

Hewlett Packard uses proprietary house numbers on a lot of the chips in their products. You can see from the logos that at least two of those 40-pin chips were actually made by Motorola for HP, but they have the 1820-xxxx HP part numbers on them. Sometimes you might find another of the same board which has a non-house numbered chip on it, or occasionally the house numbered chip may have the original manufacturers part number printed on the bottom side of the chip. I got lucky that way once and figured out what the driver chip was for the pen turret on the HP7475 plotter. It was much cheaper to solder in a new chip than to replace the whole board. It turned out I already had the chip too because it was the same as one Apple used on their disk drive analog cards.

macfixer01

 

[akgold]

Yipes! That HP 8970A Noise Figure meter is still in wide use today and is/was worth around $2K. I have a couple of non working units here and can get near a grand for them if I was to sell them. You need to do a little due diligence before ripping items like that apart. Some of the other units were worth more than the metals or components inside them.

 

[tlcarrig]

Wow! This is some nice stuff.