HP-50g - In depth data sheet

[Claudio L.]

(04-22-2019 05:37 PM)Visty Wrote:  Im mainly just looking for information to see what I can do I possibly want to expand the internal flash memory just for shits and gigs but I am really just looking to see what I can do as a learning leasson

The I think you should start with the S3C2410 manual to get familiar with the CPU (which includes most communications modules). Then newRPL's source code has (in the firmware folder) simple code to setup many of the features, there's also info on physical memory maps, some simple drivers, etc.
Since you mentioned the flash chip, it's an SST39VF1602 (2MB) on the 50g/40g, and SST39VF1601 (1MB) on the 39 series. There's a rudimentary CFI driver I wrote, and I'm currently working on an updated driver to do firmware updates over the USB port (almost done).
By the way, newRPL provides you with low-level PEEK and a POKE commands that will write a 32-bit word to any address you provide, so it's an easy way to interactively play with the GPIO, program the hardware directly, etc. all from the RPL environment.
Most of the GPIO connections are documented in the code itself. Still missing drivers for serial port and the buzzer.
I just connected a JTAG to my (damaged) 50g, so I can provide the pinout as well if you need it.

The only other person doing hardware mods out there that I know of added an SD card socket to a 39gs, he posted in this forum.

So the information is out there, scattered but feel free to PM if you need help with specific items. Looking forward to seeing your posts and tutorials.