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Last update: 8 August 2010

IC number:Z8400 (Z80A CPU, Z80B CPU)
IC function:8-bit microprocessor

Component documentation
IC numberManufacturerDocumentation
Z8400 - Z80 CPUZilogProduct specification (PDF), CPU user's manual (PDF)
Z8400 - Z80 CPUSTMicroelectronicsNot available

Component versions
IC numberPackageSpeedCBM part numberCBM part descriptionReplacement parts
Z8400A - Z80A CPU40-pin DIP4 MHz906150-01Z80A CPUZ0A CPU available from:Conrad
Z8400B - Z80B CPU40-pin DIP6 MHz906150-02Z80B Microprocessor 6 MHz

Positions
DevicePositionPackageSpeed
A2090U28DIP4 MHz
A2090AU28DIP4 MHz
C128 revision 6U10DIP6 MHz
C128 revision 7U10DIP6 MHz
C128DU10DIP6 MHz

Pinout
PinTypeNameSignal name
A2090, A2090AC128 revision 6C128 revision 7C128D
1..5OutputA11..A15KA11..KA15A11..A15
6InputCLKCLKZ80_PHI via U60 and Q6Z80_PHI via U60 and U57
7..8I/OD4..D3DB4..DB3 via U31ZD4..ZD3
9..10I/OD5..D6DB5..DB6 via U31ZD5..ZD6
11Power+5VVCC+5V
12I/OD2DB2 via U31ZD2
13I/OD7DB7 via U31ZD7
14..15I/OD0..D1DB0..DB1 via U31ZD0..ZD1
16InputINT__INTRQIRQ_
17InputNMI_VCC via RN6+5V via R34+5V
18OutputHALT_unused
19OutputMREQ__MRQunused
20OutputIORQ_IORQZ80I/O
21OutputRD__RDconnected to pin 1 of U12
22OutputWR__WRconnected to pin 1 of U31connected to pin 5 of U31
23OutputBUSACK_unusedconnected to pin 11 of U37BUSACK_ via U37
24InputWAIT__CWAIT+5V
25InputBUSREQ_VCC via R6BUSREQ_connected to pins 6 and 8 of U37 and pin 2 of U60connected to pins 2 and 4 of U37 and pin 12 of U57
26InputRESET__XRSTRESET_
27OutputM1_unusedM1_
28OutputRFSH__RFSH via U37 and U29unused
29PowerGNDGND
30..40OutputA0..A10KA0..KA10A0..A10

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