GAL16V8
gluez80

A4 A5 A6 A7 A15 NC M1 MREQ IOREQ GND
RFSH NC NC NC /IACK UARTENP /UARTEN /RAMEN /ROMEN VCC

ROMEN = /MREQ * RFSH * /A15
RAMEN = /MREQ * RFSH * A15
UARTEN = /IOREQ * /A7 * /A6 * /A5 * /A4
UARTENP = /IOREQ * /A7 * /A6 * /A5 * /A4
IACK = /IOREQ * /M1

DESCRIPTION
Z80 computer 2 glue logic and address decoding
/ROMEN enables the ROM for memory cycles from 0000h to 0fffh
/RAMEN enables the RAM for memory cycles from 1000h to ffffh
/UARTEN enables the DUART for I/O cycles from port 0 to 15
UARTENP is the negation of /UARTEN, needed for the DUART wait state logic
/IACK signifies an interrupt acknowledge cycle