8.1.5 MMU

Atari ST Custom Chips Pinout
MMU ST Serie Memory Managment Unit 68 Pin PLCC

 Pin          Signal       Typ      Beschreibung
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 1-4          D4-D7        I/O      Datenleitungen
 5            CLK          Input    16Mhz Clock / Takt
 6            CAS0H-       Output   Ramselekt 0H Bank0 High
 7            CAS0L-       Output   Ramselekt 0L Bank0 Low
 8            RAS0         Output
 9            LATCH
 10           Vcc A        Input    +5 Volt Versorgungsspannung
 11-16        A16-A21      I/O      Adressleitungen
 17           LDS-
 18           RAS1-
 19           4MHZ         Output   4Mhz Output
 20           8MHZ         Output   8Mhz Output
 21           CAS1L-       Output   Ramselekt Bank1 Low
 22           CAS1H-       Output   Ramselekt Bank1 High
 23           WE-
 24           DMA-
 25           WDAT-
 26           UDS-
 27           GND A        Input    Masse, GND
 28           CMPCS-
 29           DCYC-
 30           RDAT-
 31           DEV-
 32           AS-
 33           RAM-
 34           R/W-          Output  Low = lesen, High = schreiben
 35-43        A15-A7        I/O     Adressleitungen
 44           Vcc B         Input   +5 Volt Versorgungsspannung
 45-50        A6-A1         I/O     Adressleitungen
 51           VSYNC         Output  V-Sync. für Video
 52           DE
 53           DTACK-        Output
 54-59        MAD5-MAD0     I/O     Multiplex Adress-Databus
 60           MAD6          I/O      "           "     "
 61           GND B                 Masse, GND
 62-64        MAD7-MAD9     I/O     Multiplex Adress-Datenbus

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Abbildung 1 - Atari PLCC MMU
Custom Chips (c) Atari Corp.
Technical Data: ST ServiceGuides