Post Reply 
HP-85 ROM internals picture?
02-28-2017, 09:51 PM
Post: #1
HP-85 ROM internals picture?
Hi,

Has anyone got a picture please of the inside of an HP-85 ROM? I recall they look like a blob of epoxy with wires coming out, but Google can't find an image.

Thanks,
John
Find all posts by this user
Quote this message in a reply
02-28-2017, 10:49 PM
Post: #2
RE: HP-85 ROM internals picture?
There are no visible wires it is just a blob of epoxy on a small printed circuit board with plated through holes along the long edges that provide connection to the ROM drawer. Under the epoxy blob the die is likely wire-bonded directly to the circuit board.
Find all posts by this user
Quote this message in a reply
03-01-2017, 10:06 PM
Post: #3
RE: HP-85 ROM internals picture?
... look here https://groups.io/g/hpseries80/album?id=642
Martin
Find all posts by this user
Quote this message in a reply
03-01-2017, 10:22 PM
Post: #4
RE: HP-85 ROM internals picture?
Thanks Martin!

Regards,
John
Find all posts by this user
Quote this message in a reply
03-02-2017, 05:04 AM
Post: #5
RE: HP-85 ROM internals picture?
The link requires an account and login.

http://WilsonMinesCo.com (Lots of HP-41 links at the bottom of the links page, http://wilsonminesco.com/links.html )
Visit this user's website Find all posts by this user
Quote this message in a reply
03-02-2017, 09:21 PM
Post: #6
RE: HP-85 ROM internals picture?
(03-02-2017 05:04 AM)Garth Wilson Wrote:  The link requires an account and login.

Ah, yes - I have attached one reduced scale version of one of my images.
If you are interested in Series-80 computers you should join this group (in addition to this Forum) because it specializes on the Series-80 systems. No big overlap with the more calculator-centric business going on here.
Martin


Attached File(s) Thumbnail(s)
   
Find all posts by this user
Quote this message in a reply
Post Reply 




User(s) browsing this thread: 1 Guest(s)