HP Forum Archive 19

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Some progress (HP 85B) Message #1 Posted by Olivier De Smet on 27 Apr 2010, 6:30 a.m. Hi, just some pictures for my last project. http://sites.google.com/site/olivier2smet2/hpseries80/fpga-hp85b Bye

Re: Some progress (HP 85B) Message #2 Posted by J-F Garnier on 1 May 2010, 5:11 a.m., in response to message #1 by Olivier De Smet 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) Message #3 Posted by Juergen Keller on 1 May 2010, 4:11 p.m., in response to message #1 by Olivier De Smet Are there any technical background information?

Re: Some progress (HP 85B) Message #4 Posted by Olivier De Smet on 2 May 2010, 3:01 a.m., in response to message #3 by Juergen Keller 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.

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