Topic       : The ATARI Compendium
Author      : Scott Sanders / JAY Software
Version     : 1.25 (20/6/2003)
Subject     : Documentation
Nodes       : 1117
Index Size  : 32614
HCP-Version : 6
Compiled on : Atari
@charset    : UTF-8
@lang       : en
@default    : 
@help       : %About
@options    : +g -i -t4 +y +z
@width      : 100
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                             System Control Unit


Location(s)   SizeBYTE   Occupies one byte (8 bits).
WORD   Occupies one WORD (16 bits).
LONG   Occupies one longword (32 bits).
OW     Occupies the odd WORD of a LONG.
EW     Occupies the even WORD of a LONG.
OB     Occupies the odd BYTE of a WORD.
EB     Occupies the even BYTE of the WORD.
  MchnIf the box is shaded then address is available
for this computer.

        ▒ ▒ ▒ ▒ ▒ ▒
        | | | | | '------- Falcon030
        | | | | '--------- TT030
        | | | '----------- MEGA STe
        | | '------------- STe
        | '--------------- MEGA ST
        '----------------- ST
  TypeROM          Location is Read-Only Memory
RAM          Location is Read-Write Memory
I/O          Location is hardware-mapped
VME          Location addresses VME address space
N/A          Not applicable
RO           Read-only location
WO           Write-only location
RW           Read-write location
RSVD         Reserved
Unassigned   Either not assigned or undocumented
  Meaning                         (see Usage)

                      ▒▒
0x00FF8E00    OB      ▒▒  I/O   SCU System Interrupt Mask
                      ▒▒
                      ▒▒
0x00FF8E02    OB      ▒▒  I/O   SCU System Interrupt State (RO)
                      ▒▒
                      ▒▒
0x00FF8E04    OB      ▒▒  I/O   SCU System Interrupter: Set Bit #0 to
                      ▒▒        generate VME interrupt IRQ1
                      ▒▒
                      ▒▒
0x00FF8E06    OB      ▒▒  I/O   VME Interrupter: Set Bit #0 to generate
                      ▒▒        VME interrupt IRQ3
                      ▒▒
                      ▒▒
0x00FF8E08    OB      ▒▒  I/O   SCU General Purpose Register 1
                      ▒▒
                      ▒▒
0x00FF8E0A    OB      ▒▒  I/O   SCU General Purpose Register 2
                      ▒▒
                      ▒▒
0x00FF8E0C    OB      ▒▒  I/O   VME Interrupt Mask
                      ▒▒
                      ▒▒
0x00FF8E0E    OB      ▒▒  I/O   VME Interrupt State (RO)
                      ▒▒
                   ▒▒▒▒▒▒
0x00FF8E10 -  N/A  ▒▒▒▒▒▒       Unassigned
0x00FF8E1F         ▒▒▒▒▒▒
                   ▒▒▒▒▒▒