HP15C LE vs. HP15C

[Paul Dale]

(10-06-2014 06:44 AM)robert rozee Wrote:  there does seem to be an empty SO-8 footprint(s) on the PCB - perhaps intended to accommodate and 8-pin EEPROM?

Unfortunately, no. There is an exposed SPI bus which we could use for extra storage space. How would one program it? What would the performance be like?

We've hit the limits of the 30B hardware very hard. We're out of flash, non-volatile RAM and volatile RAM. Marcus managed to find 55 bytes of semi-non-volatile RAM in the LCD driver by not having a blinking cursor. This is completely used. We really are down to a couple of *bits* of RAM left. Flash is completely full. We've pushed this one pretty much as far as possible.

Walter will willingly inform anyone as to how awesome and complete the 30B display is


Pauli