Rockwell Automation D17846.2.4 CONTROLNET KT EMULA - Manual (Page 13)

Publication 1784-6.2.4 - September 1997
Overview of the KTCX Card Environment 1-5
Selected Base Address
The KTCX dual-port is 16K in size. See the 1784-KTCX Installation
Manual (Pub. 1784-5.20) for all the available dual-port and I/O
addresses and their respective settings. The KT Emulation dual-port
location is the same as the 1784-KT. For example: if the dual-port
address is at 0D000h, then the KT Emulation dual-port address starts
at 0D300h.
Segment:Offset Notation and Base Address
The KTCX card’s dual-port emulation interface is 2048 bytes RAM
and 7 bytes that mimic the KT’s 7 bytes of memory-mapped hard-
ware. The dual-port RAM contains all the host-accessible memory,
registers, and flags.
The address of this dual-port RAM is 300h:0 in beyond the host base
address at which you install the KTCX card. Refer to Table 1.A for
examples of how to calculate a dual-port address from the base
address. You will find the complete list of possible installation
addresses for KT modules in the 1784-KTCX Installation Manual
(Pub.1784-5.20).
Table 1.A“Segment:Offset” Notation for Dual-port Addresses
Important: Since a change in the segment address does not affect the
offset addresses, we refer only to the offset addresses throughout this
document.
If you install the
KTCX card at: The dual-port RAM
starts at: The valid range of dual-port
addresses is:
C000:0000h C300:0000h C300:0000h to C300:0806h
D400:0000h D700:0000h D700:0000h to D700:0806h