ZiLOG Z80 User Manual page 15

U3
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This integrated circuit provides a special reset signal to the PIO. There is no separate
reset pin on the PIO, so instead the M1 pin has an extra function. When M1 is low
and both RD and IORQ are high, the PIO enters a reset state.
U3 socket
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1
Reference Description
U3 74HCT08, quad 2-input AND gate
Supplier Part number
Farnell 9591796
Mouser 595-CD74HCT688E
RS 527-514
Reference Description
U3 socket 14 pin PDIP IC socket 0.3"
Supplier Part number
Farnell 2445621
Mouser 571-1-2199298-3
RS 674-2438
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