Changes between Version 4 and Version 5 of geniuspc

geniuspc

-              v4
+              v5
  * Cartridge port, apparently on memory bus with system ROM and storage flash. The french system comes with cartridges only containing straps, likely shorting some pins enable extra features... The german version seems to have extra flash memory or maybe ROM ?
+The ROM seems to be a 16-bit one, available directly on the CPU bus. The FLASH is 8-bit, but directly on the CPU bus  as well. The RAM is accessed through the VTech 27-05793 chip, which likely handles memory refresh.
+I don't know if the RAM is mapped as 16 or 8-bit to the CPU.
 == Other chips ==
  * BH7236AF : Video encoder (PAL/NTSC + RGB output). On french motherboard RGB is used, composite is not wired.
  * LMT324 : LM324, used as audio amplifier
  * C807U : Toshiba microcontroller. Handles mouse and keyboard scanning. Running at low speed out of internal RC oscillator, as there is no external crystal for it.
+ * C807U : Toshiba microcontroller. Handles mouse and keyboard scanning, LEDs, on/off buttons, etc. Running at low speed out of internal RC oscillator, as there is no external crystal for it. Seems to communicate with the VTech chip through a serial link.
  * VTech 27-05793 : of course a datasheet of this one woumd make things easier. Seems to be also called "LS05PR730C102" ?
-All memory is only addressable on an 8bit databus, but goes through the VTech custom chip ZKAM9742, which likely converts 16/8bit access.
 Output : RGB color video and mono sound.