Products > Test Equipment
Some old school instruments showing how it's done (HP 3325A and Fluke 8506a)
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joeqsmith:
Running the symbolic debugger I am able to single step the simple program, disassemble and what not.  I need to take the time to fully read the manual but the one problem I am seeing is ^C will not exit the program.   

Shown is single stepping (or trace as they refer to it) the wiki example. 
joeqsmith:
After a lot of trial and error, I finally have the basic tools working.   Don't use "_" in file names and keep them to the 8.3 format.   The also try to help you by embedding a jump at the start and moving the code so it will run on the CPM computer that they were targeting.  To get around this, don't enable support for the linker's Intel HEX format.   

Starting with a single file,  I can now assemble, link, split it into the two PROMs, verify them against the original PROMS, then load the images into my old EPROM emulator.  This unit supports two devices, perfect for the Fluke.  I made a couple of cables to plug it into the controller board.   Getting close.
joeqsmith:
It's a tight fit without the extender but doable. 

Shown running the meter from the assembled code loaded into the simulated PROMs.   With the tool chain now working, the next step is to get the logic analyzer on it and see if I can sort out the area of code I am after.   
SilverSolder:
That is looking pretty impressive!  - so you actually have an assembly listing that can be used to build the original PROMs with no differences encountered?  - that must count as a small miracle!  :D


I've had my head buried in Diptrace all weekend, trying to get to grips with it by building a brushless motor driver board.  I thought that sounded like a fairly simple project that couldn't possibly take more than a few hours...    :-DD
joeqsmith:

--- Quote from: SilverSolder on March 01, 2021, 05:39:39 am ---...
 so you actually have an assembly listing that can be used to build the original PROMs with no differences encountered? 
...

--- End quote ---
Yes but keep in mind, the assembly code could be completely made up of an ORG, several DBs and an END. 

The MicroSoft assembler will support the standard 8080 format from that time so the syntax has not been a problem.   The MicroSoft linker will also output symbolic data for the Digital Research debugger. 
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