Address Assignments
B.2 KA681/KA691/KA692/KA694 Detailed Local Address Space Map
BDR Address Decode Match Register
2014 0140
BDR Address Decode Mask Register
2014 0144
Battery Backed-Up RAM
2014 0400 - 2014 07FF
Reserved Local Register I/O Space
2014 0800 - 201F FFFF
Reserved Local I/O Space
2020 0000 - 2FFF FFFF
Local Q22-bus Memory Space
3000 0000 - 303F FFFF
Reserved Local Register I/O Space
3040 0000 - 3FFF FFFF
B.3 External Internal Processor Registers
Several of the Internal Processor Registers (IPRs) on the KA690 are
implemented in the NCA or SSC chip rather than the CPU chip. These
registers are referred to as External Internal Processor Registers and are listed
below.
IPR #
Register Name
Abbrev.
=====
=============
======
27
Time of Year Register
TOY
28
Console Storage Receiver Status
CSRS*
29
Console Storage Receiver Data
CSRD*
30
Console Storage Transmitter Status
CSTS*
31
Console Storage Transmitter Data
CSDB*
32
Console Receiver Control/Status
RXCS
33
Console Receiver Data Buffer
RXDB
34
Console Transmitter Control/Status
TXCS
35
Console Transmitter Data Buffer
TXDB
55
I/O System Reset Register
IORESET
* These registers are not fully implemented, accesses yield
UNPREDICTABLE results.
B.4 Global Q22–bus Address Space Map
Q22-bus Memory Space
---------------------
Q22-bus Memory Space
(Octal)
0000 0000 - 1777 7777
B–8 Address Assignments
