Casio CFX-9850GB Plus 32KB WE (White Edition): 64KByte "upgrade" reconfiguration

[jebem]

The PCA is fixed using a few screws. No snap in / latches / rivets are used here.
Really a pleasure to work with when maintenance is required.




Idle current consumption: 2.5mA from 4 x AAA battery cells (6VDC).




Reconfirming that the new 64KByte SRAM sizing is recognized.
There are 61396 Bytes available to the user after a memory clear.




Running again the self test by pressing F6 + a b/c + AC/ON.
This calculator shows this model code: GY357




Testing the 8Mbit PROM.
ROM version 1.0. Four byte checksum = 0642FEA8




Testing the new 64KByte SRAM configuration.
RAMaddress = F7FF
Write/Read pattern: AA (just a basic h/w test using a 10101010 binary combination).




Color LCD from the 90's by CASIO.
Changing the contrast changes the temperature of each color. To see the Orange, Blue and Green colors will require a specific contrast setting, despite being possible to adjust the three individual colors as well.