The Mz-80B Circuit Diagrams - Sharp MZ-80B Owner's Manual

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4.4 The MZ-80B circuit diagrams
This section includes all MZ-80B circuit diagrams for reference. These diagrams are arranged as
follows:
(I) CPU board , block 1 : CPU signal system
(2) CPU board, block 2
(3) CPU board, block 3 : 8255 and PIO signal system
(4) CPU board, block 4 : RAM signal system
(5) CPU board, block 5
(6) CRT display control
(7) Cassette tape deck control
(8) Power supply
(9) Graphic Memory 1 card (optional)
(10) Expansion 1/0 port (optional)
(11) Graphic Memory 2 card (optional)