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[CPU]
1C204 is a system controller CPU and its main functions are as follows.
(1) Communication with the host computer
(2) Serial-communication (Pins 77 through 80) with the mechanical control CPU (PRT-11 board)
(3) Sets data in the memory control gate array (IC102)
(4) Sets data in the color palette IC101
(5) Serial-communication with the EEPROM (IC201)
(6) Lights up LEDs
Print, Alarm, Ribbon, Paper
(7) Determines key inputs
Print (UP-D2550 (For J) only), Stop
(8) Sounds the buzzer
(9) Selects the marking (UP-D2550 (For J) only)
The program is memorized in the external ROM IC210.
CNI212 is a socket for tools. It is used for inserting the LED display for showing data during
adjustments.
$201 through S207 are also keys for adjustments.
4-4
UP-D2509(LJC,CE)
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