Next step is an HP86B with 2MB of extended memory, an optional 640x480 graphic mode, an optional speed multiplyer of 5 (from 0.625MHz to 3.125MHz on the fly), an extended extended memory controler (PTR3, PTR4) with full 16MB access, some IO to configure XROMs from the system (to add and remove standard XROM from the on-board flash, or add and remove XROM from upper RAM (14-16 MB), an on-board HPIB-9121 compatable DISK system (8 banks of 4 264KB 3,5" floppies + 8 banks of 4 1080 8" floppies) from a 256 MB SD Flash.
Somes bugs remains :
Some pictures :
Many bugs corrected (the XMEM have to restore DRP from PAD !!! it was the bug for reading some files !!!) a better keyboard, FORTH is now ok, 'LABEL' also.
For the curious a ZIP to test an HP86 :)
(you have to get the XCS1200 SPARTAN3E, Nexys 2 board from digilent)
New release with an HP82939A serial module :)
New Release (version 34) with a functionnal x20 clocks (gives x15 in average with wait states for mem access). Now the sources are free (gpl license)