Random Reverse Engineering Notes

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Memory Layout J5000

fffffff0f0400000 - unknown
fffffff0f0500000 - EEPROM (Stable Storage)
fffffff0f05d0000 - LCD
fffffff0f05f1010 - Microcontroller?
fffffff0fee00070 - (RTC?) index
fffffff0fee00071 - (RTC?) data

PDC PAGE0 processor specific

0x640: code that will be executed when PDC_PROC(0) is called, loop with nops:
  0x00000640  e81f1ff5  08000240  08000240  08000240
  0x00000650  08000240  08000240  08000240  08000240
  0x00000660  08000240  08000240  08000240  08000240
  0x00000670  08000240  08000240  08000240  08000240
0x680: OS rendezvous code

Undocumented PDC routines

ARG0 ROM internal index Name
0x81 0x1a EEPROM read/write
0x84 0x1b
0x87 0x1c
0x88 0x1d
0x8a 0x1e
0x8b 0x1f
0x8f 0x21
0x90 0x22
0x91 0x23
0x93 0x24
0xa3 0x20
0xa5 0x25
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