HP97 The journey begins
|
10-05-2022, 03:26 AM
Post: #608
|
|||
|
|||
RE: HP97 The journey begins
Hi all,
I received the circuit boards for the ROM replacements. The 18 pin board will replace ROM 0 chips which also provide display information. The 8 pin ROM boards come in 2 types, ROM only and ROM/RAM types. ROM only boards do not have the data line for RAM. The 8 pin ROM/RAM types can be programmed to replace one, some, or all of the 8 pin ROMs in a single package. These will be a bit of a challenge to assemble due to the tiny component sizes. I will start with the HP-92 ROM 0 chip that broke while I was trying to read from it. Hopefully it will spring back into life. As I thought, the Spice CPU board hit a snag and will need a re-hash - the joys of prototyping. cheers Tony |
|||
« Next Oldest | Next Newest »
|
User(s) browsing this thread: 4 Guest(s)