Mama Mitte

Mama Mitte is software that focusing on tracking pregnancy and assisting mothers in giving birth. The software was a pack-in with a specialized variant of the SwanCrystal.

Debugging Context#

Jump/Call Table#

The main jump/call table exists at 4000:15F1 (offset: 0x415F1) and is called at 4000:0270.

Debug Mode#

A debug mode routine exists at 4000:EDE0.

Flash Memory Test#

A flash memory test routine exists at 4000:F210.

Cartridge Check#

A cartridge check routine exists at 4000:5F98.

It is accessible during the intro using the correct keypress sequence.

PC Data Transfer#

A PC transfer routine exists at 6000:DF42.

It is accessible during the intro using the correct keypress sequence.

Calibration#

A calibration routine exists at 4000:AA3E.

It is accessible during the intro using the correct keypress sequence.

Factory Check#

A factory check routine exists at 4000:C8EE. They're similar to the calibration routine checks.

It is accessible during the intro using the correct keypress sequence.

WAV (RIFF)#

A WAV "parser" to DMA routine exists at 4000:11E0. It's used to play the intro vocal clip (offset: 0x90000).

Checksums and More#

There are various checks and bounds within the ROM to ensure the cartridge is running on a Mama Mitte console; The first, occurs at 4000:0224 and checks whether the last word of the internal EEPROM (word offset: 0x3FF) is 0x1234, while the second, occurs at 5000:E820 and checks whether the Swan ID (size: WORD) located in internal EEPROM (word offset: 0x3D) is the same as the value in ROM at F800:0025 (offset: 0xF8025). A factory restore will read and store the Swan ID from internal EEPROM.

There are also countermeasures to verify the ROM hasn't been modified by the way of calculating checksums (8-bit sum) on sections of data throughout the ROM; The hardcoded Swan ID being in one of those sections. A validation routine exists at 4000:13B6 with five WORD sums stored at F800:0002 (offset: 0xF8002); The first pertaining to the section where the Swan ID exists and the remaining four are for the four user slots.

A user slot is allocated 0xEEC of NOR space.

A never written user slot is filled with 0xFF's, i.e. the NOR erased value.

MM-280 Debug Mode#

Dated: 02/05/20

Tests the infrared functionality of the cartridge.

The routine offset 4000:EDE0 can be added to the end of call table at offset 0x41649 and called upon by setting 0x540 to the value 0x16.

Flash Memory Test#

Dated: 02/05/01

Tests the NOR flash functionality of the cartridge.

The routine offset 4000:F210 can be added to the end of call table at offset 0x41649 and called upon by setting 0x540 to the value 0x16.

Cartridge Check#

Dated: 02/07/22

PC Data Transfer#

Calibration#

Power On#

EEPROM Clear#

Impedance Adjustment#

Impedance Check#

Error Adjustment#

Error Check#

MM-280 Specification Check#

Altitude Adjustment#

ID Settings#

Adjustment Check#

Power Off#

Error Messages#

Checksum Failure#

Error message appears if the ROM fails checksum validations with an option to restore to factory defaults.

The display routine is located at 5000:E64D.

Swan ID Mismatch#

Error message appears if the Swan ID from internal EEPROM doesn't match the ROM value.

The conditional check and display routine is located at 5000:E807.

1234 Mismatch#

Error message appears if the last word of internal EEPROM doesn't match 0x1234. It's what you see when the cartridge is inserted in a non-mama Mitte SwanCrystal.

RTC Error#

Error message appears if there is a clock malfunction.

The conditional check and display routine is located at 5000:E72D.

WAV (RIFF)#