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Category B Terminal Restrictions
Category B terminals (for example, the IBM 3277 Display Station and 3284
and 3286 Printers) cannot be used on the same 3274 when the 3274 is
customized to support 3270 PCs operating in distributed function mode.
Customizing the 3274 Control Unit
Customizing the 3274 usually involves a planner and someone who is
responsible for the actual customization operation. The planner identifies
and compiles the configuration information needed for each 3274 and gives
that information to the person responsible for customizing the 3274. This
person is prompted by a series of three-digit sequence numbers that require
particular responses. Full details of the sequence numbers and relevant
responses are given in the customizing guides for the 3274; see
"Customizing Guides" below.
3274 Models and Configuration Support
Figure 41 shows the models of 3274 Control Unit and configuration support
required for the 3270 PC. For graphics applications, the 5371 system unit
must operate in DFT mode and the 3274 must have configuration support T
or D.
3274 Model
Storage
Configuration Support
(System Unit in DFT Mode)
lA, lC, 1D
128K
T
31A, 31C, 31D
SlC
31A, 31C, 31D
192K
D
41A, 41C, 41D
SlC
61C
Note:
Configuration support T must be at release level 31 or
higher, and configuration support D at release level 61 or
higher.
Figure 41.
Configuration Support for 3270 PCs
When the 3274 is customized for a given support level (such as 31 or 61), the
IBM 3270 Personal Computer must be tailored to operate with that support
level. The 3274 configuration support release level is indicated by a
two-digit validation number that follows the IBM part number printed on
the label of the 3274 diskette. The customizing guides also have a two-digit
validation number printed on the front cover. This number should match
the number on the diskette label.
The display station or work station that is used for customization must be
attached to Port AO of the 3274.
92
Introducing the IBM 3270 Personal Computer/G and /GX Work Stations
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