HP-25C Eumulator
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11-27-2014, 12:51 PM
Post: #100
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RE: HP-25C Eumulator
(11-27-2014 07:31 AM)Didier Lachieze Wrote:The current hardware design does not allow for that. At most, one can replace the 3 ROMs (21/25C/33C) w/ a single 34C ROM with minor software modification. And due to the limited RAM the MSP430G25x3 provides, there will not be full programming steps available.(11-27-2014 12:24 AM)Chris Chung Wrote: This the the most powerful MSP430 MCU in DIP package. If we want to also emulate 34C, I will have to move to SMT devices. Replacing the G25x3 w/ a more potent F2274 MCU will allow for 4 ROMs plus enough RAMs for a 34C emulation. It will also eliminate the need for the 74HC164 shift register. This requires a re-design hardware and quite a bit of changes on the software (mostly LED driving). This design exists only on my head and I am not planning to work on it right now as there are other interesting projects for me. I will however work on a reduce 34C firmware that runs on the current PCB later on. If you have a unit it is a good idea to find out how to acquire firmware flashing capability so that you can flash new / patched firmware in the future. I had mentioned how (and what's needed) this can be done in previous posts. |
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