System information

Book Title
Memory Maps
B-518
Table B-19 CSC/3 Memory Map
Table B-20 CSC/4 Memory Map
2010C0C0 CSC-MCI card 40 Unit 3
2010C100 CSC-MCI card 40 Unit 4
2010C140 CSC-MCI card 40 Unit 5
2010C180 CSC-MCI card 40 Unit 6
2010D000–2010 FFFF Unused — —
Address Bit Width Description Comments
00000000–003FFFFF RAM —
01000000–0107FFFF ROML —
0108FFFF–010FFFFF ROMH —
02000000–020FFFFF Multibus memory —
02100000–0210FFFF Multibus I/O —
02110000–02110001 16 System control register —
02110100–02110103 32 System status register —
02120000 8 Counter timer —
02120040 8 Counter control register —
02120100–0212013F Serial ports —
020B0000–020B7FFF NVRAM Over Multibus
Address Description Comments
D0D0D0D “Poisoned free” address Used by the “poisoned free” code to make sure the
system is not accessing freed memory. An error at or
near this location usually indicates a software bug.
2100000–21FFFFF Multibus I/O space Not all I/O space is occupied by interface cards. Bus
errors that do not correspond to a real interface card
are probably software bugs.
210C000–210C200 MCI and ciscoBus
controllers (CSC-CCTL
and CSC-CCTL2)
Common failures result from attempts to access the
command and argument registers that occupy the first
4 bytes of the address space of each board.
21000A0–21000AF Netrionix 4-Mbps
Token Ring card
Each card occupies 4 bytes.
21000B0–21000BD CSC-C2CTR card Each card occupies 2 bytes.
2100000–2100003 Control register for the
ENVM
Environmental monitor card.
2000000–20FFFFF Multibus memory space Used by interface cards and by shared Multibus
memory.
20C0000–20FFFFF Shared memory on
CSC-R16 cards
Token Ring units 5 and 6. Each card has 0x20000
bytes of memory.
Address Description Size (in Hex) Comments