Technical Description; Isa Bus Support - Epson S1D13503 Technical Manual

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3 TECHNICAL DESCRIPTION

3.1 ISA Bus Support

This board directly supports the 8/16-bit ISA Bus with Indexed I/O via a standard AT edge connector. Only those config-
uration resistors needed for ISA Bus support have been assembled, refer to Hard-Wired Configuration Inputs, on page 9
for configuration details. External logic has been added to provide signals which the S1D13503 does not directly support.
See Application Note X18A-G-003-xx for details.
This board is pre-set to use indexed I/O with base address 000 0011 0yyy 000x, where x is don't care and yyy can be
configured through dip-switch SW1-7 to SW1-5. The factory setting of yyy = 001, i.e., I/O address = $0310 and $0311.
The display memory bank address is described in SRAM Support, on page 14.
Example:
I/O write $310 01 :set index = 1
I/O read $311
I/O write $310 05 :set index = 5
I/O write $311 07 :write 07 to AUX[5]
This board has been designed to operate as a stand-alone card or in conjunction with either a VGA or a monochrome display
adapter card.
With VGA
When the VGA display adapter used is an ISA or VL bus with an 8-bit BIOS EPROM (normally just one ROM on the
adapter card) the S5U13503B00C must be configured as follows:
SW1-1 open
SW1-2 to 4 open
SW1-5 to 7
JP1 2-3 shorted
JP2 to JP4
JP5
When the ISA or VL bus VGA video adapter has a 16-bit BIOS EPROM (normally two ROMs on the adapter card), the
16-bit ISA bus interface (SW-1 closed) must be used on the S5U13503B00C.
When using the S5U13503B00C in conjunction with a PCI bus VGA display adapter either the 16-bit ISA bus interface or
the 8-bit ISA bus interface may be used on the S5U13503B00C.
With Monochrome
When using the S5U13503B00C in conjunction with a monochrome display adapter either the 16-bit ISA bus interface or
the 8-bit ISA bus interface may be used on the S5U13503B00C.
Stand-Alone
The S5U13503B00C can be used as a stand-alone video adapter. When used as a stand-alone video adapter the BIOS setup
program for the computer must support and have "No Video" selected as the video adapter. The 13503BIOS.COM utility
program can be used with the evaluation board to simulate a standard video BIOS, thus providing text and cursor function-
ality. See the 13503BIOS.COM Utility manual, X18A-B-003-xx for details.
S5U13503B00C Rev. 1.0 Evaluation Board User Manual
Issue Date: 01/01/30
Downloaded from Elcodis.com electronic components distributor
:read contents of AUX[1]
: 8-bit operation, necessary to prevent MEMCS16# conflict when reading VGA BIOS
: for ISA bus support with indexed I/O
: set as desired
: to reflect SW1-1 polarity
: to reflect SW1-5 to 7 polarity
: set as required for panel
Page 13
S1D13503
X18A-G-007-05