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3708 Cartridge
Functions
The cartridge contains 256K bytes of EPROM. The EPROM contains three types of
data:
Microcode
All of the 3708 diagnostic and operational microcode (except for patches)
resides and executes on the cartridge.
Tables and constants
The 3708 microcode uses the following data:
• Vector tables
• Control terminal screen panels and messages
• IBM-supplied configuration
• Terminal tables
• Default and alternate translate tables.
Cartridge vital product data
This data includes the following:
• Microcode EC level
• Cartridge checksum
• Miscellaneous other fields.
This section gives an overview of protocol conversion, protocol enveloping, and
ASCII pass-through modes. These functions are described in detail in the remaining
chapters. It also includes a list of functions that can be performed from the control
terminal.
Protocol Conversion
Display Support
In protocol conversion mode, the 3708 provides all the functions in IBM 3274
Configuration Support A. It provides additional functions such as alert and
response time monitor (RTM) data support and power on/off notification to the
SNA hosts.
An ASCII display operating in protocol conversion mode appears to the SNA host
as an IBM 3278/3279 Display Station Model 2, 3, 4, or 5. The 3708 supports an
ASCII display operating in protocol conversion mode as a logical unit (LU) type 2.
To support ASCII displays in protocol conversion mode, the 3708 does the
following:
• It
uses keyboard mappings to define keystroke sequences that are equivalent to
IBM 3270 key functions. The 3708 provides mappings for many types of ASCII
displays. In addition, up to six mappings can be user-defined for other types of
ASCII displays. A display that has a user-defined mapping is referred to as a
user-defined terminal.
Chapter 1. Introduction
1-7
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