16. Memory Module Socket (U17)
ÛZIATECH
79
1. Install jumpers W2A and W4B
2. Insert the PROM into the boot socket. Make sure the device is correctly oriented.
3. Power on the system with the CPU reinstalled. The CPU will boot either to a Mini
Command colon prompt (:) or a P: prompt if the P: drive contents are still intact.
4. To reflash the BIOS, insert the STD 32 Development Software diskette (ZT 97137)
into the floppy drive and type either
A:\UTIL\FLASH /B A:\IMAGES\SYS8907.B00
or
A:\UTIL\FLASH /B A:\IMAGES\SYS8907M.B00
depending on whether you are recovering a STAR BIOS image or a standard BIOS
image. An
M
at the end of the filename indicates STAR BIOS; no
M
indicates
standard BIOS. Type the
"Y"
key to respond to the warning messages and the BIOS
will be reflashed.
5. After reflashing the BIOS, turn off the power, remove the PROM, remove jumper
W2A, and return jumper W4 to the "A" position.
USER STATIC RAM
Installing a 128 Kbyte SRAM module into socket U17 provides four 32 Kbyte pages of
SRAM memory for use by user programs. Perform the steps below.
1. Install a 128 Kbyte SRAM module into socket U17.
2. Install jumper W2B. This maps the 32 Kbyte pages into the BIOS Extension region
(D8000h -- DFFFFh) when the system re-boots.
3. Install jumper W4A to battery-back the SRAM (to preserve battery life).
4. Boot the system and access the BIOS SETUP utility by pressing the
"S"
key during
the system RAM check, or by running the SETUP.COM utility from the MS-DOS
prompt.
5. In screen 2 of the BIOS SETUP utility, set the parameter "Memory Range D8000 –
DFFFFh" to "PCI" in order to access the onboard SRAM.
6. User programs switch between pages by writing to the Digital I/O ASIC's System
Register 2 (E4h). Bits 3 and 4 select which 32 Kbyte page of the SRAM is mapped
into memory range D8000 – DFFFFh. Chapter 11 illustrates the
.