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AST RESEARCH TECHNICAL BULLETIN TB-0067 11-16-84
CORRECTIONS TO THE ADVANTAGE! USER'S MANUAL VERSION 1.00
Please note the following correction information to Sections 3
and 6 of the AST Advantage! User's Manual. This information
pertains to parallel printer ports and their configuraiton.
Section 3.3 Step 5 -- Configuring the Parallel Port
___________________________________________________
The first paragraph of this section should read as follows:
You can install a maximum of three parallel printer ports in the
AT (called LPT1:, LPT2:, LPT3:). The parallel port on the
ADVANTAGE! has been configured at the factory to respond as
LPT1:, using IRQ 7. This is the correct configuration for an AT
with an IBM Color/Graphics display card and no other parallel
ports installed in the system. If you have an IBM MonoChrome
display adapter installed in your AT, refer to Section 6.1.2.
Verify the default configuration of the ADVANTAGE! by comparing
Switch Block #2 and the IRQ enable block to figure 6-1.
Table 3-4 Parallel Port Configuration with the MonoChrome Display
_________________________________________________________________
This table is in error. If configuring the parallel port as
LPT2:, the IRQ Jumper needs to be on 5 NOT 7. If configuring the
Parallel port as LPT3:, there should NOT be a jumper on either 7
or 5. This is because the AT has not reserved an IRQ for the
third parallel port of the system.
Section 6.1.2 MonoChrome Display / Printer Adapter Cards
________________________________________________________
This section should read as follows:
The parallel port on an IBM MonoChrome Display Adapter always
responds as LPT1: and cannot be reconfigured. If you have this
type of display adapter in your AT, the parallel port on the
ADVANTAGE! will automatically respond as LPT2:. However, you
will need to change the IRQ Jumper from IRQ 7 to IRQ 5 (LPT2:
will always use IRQ 5).
Section 6.3 Parallel Port I/O Addresses and Pinouts
___________________________________________________
The parallel port on the ADVANTAGE! uses these PC-AT I/O port
addresses when an IBM MonoChrome Display Adapter is installed:
AT Parallel Port I/O & IRQ Assignments
Port I/O Address IRQ Line Used Location of port
____ ___________ _____________ ________________
LPT1 3BC-3BF IRQ 7 MonoChrome Display
LPT2 378-37F IRQ 5 AST ADVANTAGE!
LPT3 278-27F None* AST ADVANTAGE!
* Interrupt-driven I/O for LPT3 is not supported in the AT.
The parallel port on the ADVANTAGE! uses these PC-AT I/O port
addresses WITHOUT an IBM MonoChrome Display Adapter installed:
AT Parallel Port I/O & IRQ Assignments
Port I/O Address IRQ Line Used Location of port
____ ___________ _____________ ________________
LPT1 378-37F IRQ 7 AST ADVANTAGE!
LPT2 278-27F IRQ 5 AST ADVANTAGE!
LPT3 Not supported without the IBM MonoChrome Display
Adapter installed.