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PREPARATION FOR USE
2-9.
EPROM Device Installation
As
shipped from the factory, the iSBC 86/14/30 board contains no EPROH
devices.
The user may install one of several different types of EPROM
device, including static RAMs, into the EPROM sockets on the iSBC 86/14/30
board.
However, the memory address configuration depends on the type of
memory device selected; refer to the jumper configuration section of this
chapter for more information.
The EPROM devices on the iSBC 86/14/30 board must be installed into sockets
U39, U40, US7 and US8; situated on the iSBC 86/14/30 board as shown in
Figure 2-1.
Socket U39 accommodates the Bank 0, high byte memory
locations; US7 contains the Bank 0, low byte memory locations; U40 contains
the Bank 1, high byte memory locations; and US8 contains the Bank 1, low
byte memory locations.
CAUTION
The iSBC 86/14/30 board is designed to
accommodate both 24- and 28-pin Intel
EPROM/RAM chips in the same socket.
The 24-pin integrated circuit must be
installed as shown in Figure 2-2; pin 1
of the integrated circuit should line
up with pin 3 of the socket.
A maximum of 32k bytes of EPROM may be installed into sockets U39, U40,
US7, and US8 on the iSBC 86/14/30 board.
A summary of the memory space
provided by the various device types at each socket is contained in Table
2-3.
The sockets must contain only one type of EPROM device; a mixture of
various EPROM devices is not allowed.
Sockets U40 and US8 will accept
EPROM, static RAM, and pseudo-static RAM (both sockets must contain the
same type of device).
Empty sockets at U40 and US8 are allowed if their
memory space is never accessed.
After selecting the memory device type to
best suit your application, carefully insert each device into its socket.
CAUTION
Never insert MOS devices into a board
when power is applied.
Doing so could
damage the devices.
On power-up, the 8086-2 CPU jumps to a bootstrap, routine located at
memory location FFFFOH through FFFFFH in the top-most portion of the
on-board EPROM address space.
These EPROM locations are contained in the
memory chips at sockets US8 and U40.
As shipped from the factory, the iSBC 86/14/30 board contains default
jumpers enabling installation of 2k by 8-bit (2716) EPROM devices.
If a
different type of memory device is installed into the sockets,
reconfigure the memory addressing jumpers as described later in this text
(in Table 2-7).
Figure 2-3 shows some examples of memory configurations
that are possible using various capacities of memory devices.
2-8
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