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CASIO AT1
Service Manual


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  • Contains Circuit Diagrams
  • Download
  • PDF Format
  • Complete manual
  • Language: English
Price: $4.99

Description of CASIO AT1 Service Manual

Complete service manual in digital format (PDF File). Service manuals usually contains circuit diagrams, printed circuit boards, repair tips, wiring diagrams, block diagrams and parts list. Service Manual ( sometimes called Repair Manual ) is used mainly by technicians.

If You just want to know how to use Your tv, video, mp3 player etc. You should look for Owner's Manual. After placing order we'll send You download instructions on Your email address.

The manual is available in languages: English

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Text excerpt from page 8 (click to view)
CPU (HD6433298A36P)
The 16-bit CPU contains a 32k-bit ROM, a 1k-bit RAM, seven 8-bit I/O ports, an A/D convertor and serial interfaces. The CPU accesses to the working strage RAM, the DSP and the key touch LSI. The CPU also controls buttons, bender input, LEDs and MIDI input/output. The following table shows the pin functions of the CPU. Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17, 18 19, 20 21 22 23 ~ 29 30 31 ~ 38 39 40 41 ~ 56 48 57 ~ 64 Terminal P40 P41 P42 P43 P44 P45 P46 P47 TXD RXD P52 -RESET -NMI VCC -STBY VSS XTAL,EXTAL MD1, MD0 AVSS AN0 P71 ~ P77 AVCC P60 ~ P67 VCC P27 P26 ~ P10 VSS P30 ~ P37 Out In In/Out Out In Out In Out In In In In In In In In In In In Out In In/Out Out Out Out Out Out KO signal data output Clock for KO signal data APO (Auto Power Off) signal output. ON: High OFF: Low Read enable signal output Write enable signal output Not used 10 MHz clock output Wait signal input. Connected to +5 V. MIDI signal output MIDI signal input Reset signal output Reset signal input Power ON signal input +5 V source Standby signal input. Connected to +5 V. Ground (0 V) source 20 MHz clock input Mode selection input.(Internal ROM mode --- MD1: High MD0: Low) Ground (0 V) source for the built-in DAC Analog input. Connected to ground. Ternimal for button input signal +5 V source for the built-in DAC LED segment signal output +5 V source Not used Address bus Ground (0 V) source Data bus Function

Digital Signal Processor (HG51B155FD)
Upon receipt of note numbers and their velocities, the DSP reads sound and velocity data from the sound source ROM in accordance with the selected tone; the DSP can read rhythm data simultaneously when a rhythm pattern is selected. Then it provides 16-bit serial signals containing data of the melody, chord, bass, and percussion to the DAC. The DSP also adds the selected effect to the sound data using a 64k-bit RAM. The following table shows the pin functions of the DSP.

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