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+--- Thread: Some progress (HP 85B) (/thread-166385.html)
Some progress (HP 85B) - Olivier De Smet - 04-27-2010
Hi, just some pictures for my last project.
http://sites.google.com/site/olivier2smet2/hpseries80/fpga-hp85b
Bye
Re: Some progress (HP 85B) - J-F Garnier - 05-01-2010
Great project, congratulation!
I see that the CPU is ok now. Let us know the next progress...
J-F
Edited: 1 May 2010, 5:25 a.m.
Re: Some progress (HP 85B) - Juergen Keller - 05-01-2010
Are there any technical background information?
Re: Some progress (HP 85B) - Olivier De Smet - 05-02-2010
My main source is the patent # 4424563 for the description of the CPU. For the system I used the Assembler manual and other HP publications.
The global structure
The CPU
I used fig. 1 of the patent to structure the fpga project :
- schematics to structure the system
- some verilog for ALU and Control Logic
For the global system I added a picoblaze controler
to 'hypervise' the system with the serial link of the board:
- step CPU
- trace until PC
- ...
But now I think I have some timing problem with the Strataflash on the Nexys2 board. Sometimes the CPU can't 'read' the rom ...
Edited: 2 May 2010, 3:05 a.m.