Recreating a HP-25
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10-26-2016, 09:56 PM
Post: #14
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RE: Recreating a HP-25
(10-26-2016 07:21 PM)Alejandro Paz(Germany) Wrote: These last days I was able to get to work again on the core, and to iron out those bugs that prevented STO/RCL and the block-memory based register file to work. I ended, as I suspected, having to add a couple extra cycles to account for the block ram latency. Now, it works as a real 25 would do but much faster. Sadly a bit late for the meeting . Congratulations for having the STO RCL issue fixed! Your prototype didn't seem to have a PRGM/RUN switch. I couldn't enter program steps. Pressing SST or R/S button didn't show the next program step when hold down. Did you fix that too? You just have to set status bit s 15 every instruction as long as any key is hold down. HP-25 and HP-25C have the same firmware, the only difference in behaviour occurs as the RAMs of the C model doesn't clear its contents when "clear data regs" is executed. Bernhard That's one small step for a man - one giant leap for mankind. |
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Messages In This Thread |
Recreating a HP-25 - Alejandro Paz(Germany) - 06-09-2016, 07:33 AM
RE: Recreating a HP-25 - walter b - 06-09-2016, 09:10 AM
RE: Recreating a HP-25 - Thomas Radtke - 06-09-2016, 10:41 AM
RE: Recreating a HP-25 - PANAMATIK - 06-09-2016, 11:37 AM
RE: Recreating a HP-25 - Thomas Radtke - 06-09-2016, 03:38 PM
RE: Recreating a HP-25 - Alejandro Paz(Germany) - 06-09-2016, 12:03 PM
RE: Recreating a HP-25 - Guenter Schink - 06-09-2016, 07:57 PM
RE: Recreating a HP-25 - Alejandro Paz(Germany) - 06-10-2016, 04:59 AM
RE: Recreating a HP-25 - Guenter Schink - 06-10-2016, 09:13 PM
RE: Recreating a HP-25 - Alejandro Paz(Germany) - 07-09-2016, 04:40 AM
RE: Recreating a HP-25 - PANAMATIK - 07-10-2016, 10:26 AM
RE: Recreating a HP-25 - Alejandro Paz(Germany) - 07-10-2016, 11:57 AM
RE: Recreating a HP-25 - Alejandro Paz(Germany) - 10-26-2016, 07:21 PM
RE: Recreating a HP-25 - PANAMATIK - 10-26-2016 09:56 PM
RE: Recreating a HP-25 - Alejandro Paz(Germany) - 10-27-2016, 10:55 AM
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