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Syscon handles power, power-LEDs, tray loading (in conjunction with MechaCon, which actually controls the tray and the blue LED), front buttons and some [[Thermal|thermal management]].
Syscon handles power, power-LEDs, tray loading (in conjunction with MechaCon, which actually controls the tray and the blue LED), front buttons and some [[Thermal|thermal management]].


It only exists on consoles up to the SCPH-390XX series (GH-022 board) (as well as system 246/256). After that, it's functionality was overtaken by the new Dragon-[[MechaCon]].
It only exists on consoles up to the SCPH-39XXX series (GH-022 board). After that, it's functionality was overtaken by the new Dragon-[[MechaCon]].


On B/B'/C/C' [[Chassis types|chassis]] consoles, it's located on a daughter board (GD-011 for B-chassis, GD-012 for B'-chassis, GD-013 for C and C' chassis), together with RTC, EEPROM, clock battery and part of the voltage regulation circuitry.
On B/B'/C/C' [[Chassis types|chassis]] consoles, it's located on a daughter board (GD-011 for B-chassis, GD-012 for B'-chassis, GD-013 for C and C' chassis), together with RTC, EEPROM, clock battery and part of the voltage regulation circuitry.
== Arcade SysCon ==
On Namco System 246 and System 256, the SysCon has some extra functionalities. The most notable extra functionality is the Arcade watchdog, which is basically a 5 minute timer to shut down the system.
One of the Mechacon CMDs that is involved on authentication of memory cards resets this timer if it's performed on a COH-H10020 security dongle at port 1 (mc0:).


== Hardware ==
== Hardware ==
Syscon is always a Toshiba TMP87C807U.
Syscon is always a Toshiba TMP87C807U.
It has a Mask-ROM of 8 Kilobytes (8 K x 8 bits) and a RAM of 256 Bytes (256 x 8 bits).
It has a Mask-ROM of 8 Kilobytes (8 K x 8 bits) and a RAM of 256 Bytes (256 x 8 bits).
</br>[[File:M02YRsm.jpg|200px]]</br>
</br><imgur w=480>M02YRsm.jpg</imgur>
''Pictured above is a SysCon with firmware 2C64 on a GH-015 board.''
 
== Firmware revisions ==
== Firmware revisions ==
* 1G78 (GH-001, GH-003) (A/A+ chassis)
''incomplete!''
* 1V33 (GD-011, GD-012) (B/B' chassis)
* 1V33 (GD-011, GD-012) (B/B' chassis)
* 1V86 (?) (Namco System 246/256 in all? variants, probably also System 147/148?)
* 2A69 (GD-013) (C/C' chassis)
* 2A69 (GD-013, GH-008, GH-010, GH-012, GH-013, GH-014, GH-016) (AB/C/C'/D/D' chassis), MPU-001 (PS2-board of DTL-T15000)
* 2C64 (GH-015, GH-017, GH-018, GH-019, GH-022) (F/G chassis)
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