The disk is now pre pared for for mat ting. The sys tem must be re booted prior to
for mat ting with the sim ple DOS com mand :
for mat b: /s/u
Af ter the next re set the for mat ted sili con disk will boot as the A: drive. If it is ever
nec es sary to by pass the sili con disk boot in or der to re for mat or to boot the ac tual floppy
drive, or the hard disk, sim ply press the <CTRL><ALT><LSHIFT> keys si mul ta ne ously
im me di ate ly fol low ing dis play of the BIOS con figu ra tion BOX. The mes sage :
Sili con Disk Boot Aborted by User
will be dis played and the sys tem will boot from one of the avail able boot drives.
IM POR TANT NOTE :
The FLASH DISK is fully write able at all times but is not
rec om mended for con tinu ous up dat ing or data log ging. The on board BIOS im ple ments a
sim ple FAT based file sys tem (iden ti cal to a floppy disk) with no wear lev el ing
im ple mented. The PEROMs can and will wear out with ex ces sive write cy cles. AT MEL
speci fies at least 10,000 write cy cles.
4.4
Non-Bootable RAMDISK Usage
A non- bootable RAM DISK is of ten de sired in con junc tion with ro ta tional me dia. It can
then be used for pro gram up dates, pa rame ter stor age, or data log ging ap pli ca tions. A
non boota ble RAM DISK uses the Win Sys tems Uni ver sal Solid State Disk Driver (USSD)
which is loaded via the boot me dia’s CON FIG.SYS file with the en try :
de vice = ussd.sys /mod:p /pad:1ec /seg:e800 /psz:32 /inc:1 /spg:80 /dsz:512
where the 512 in /DSZ:512 is the size of the disk in Ki lo bytes and the 80 in the /SPG:80
is the start ing page ad dress in the ar ray for this sili con disk. This hexa deci mal value is
ac tu ally the count of 32K byte blocks pre ced ing the start of the RAM DISK.
NOTE :
USSD, as is the con ven tion with DOS instal la ble disk de vices, cre ates a drive
with the NEXT AVAIL ABLE drive let ter. Drives A: and B: are al ways re served for the
physi cal floppy drive or the BIOS sup ported boota ble Sili con Disk. In a sys tem with out a
hard disk, the next avail able drive let ter would be C:. In a sys tem with one or more hard
drive par ti tions, the sili con disk cre ated with USSD will be the first avail able let ter
fol low ing any other drive let ters al ready in use. Also note, that it is never nec es sary to
for mat a disk cre ated with USSD. The disks are self for mat ting us ing the size and ad dress
in for ma tion pro vided on the CON FIG.SYS in vo ca tion line. Dur ing ini tiali za tion, USSD
ex am ines the sili con disk to de ter mine if a disk al ready ex ists which matches the
pa rame ters speci fied. If so, no ac tion is taken and the disk is used as is. If there is not a
disk of the type and size speci fied, it is cre ated.
021402
OPERATIONS MANUAL PCM-586
Page 4-5
WinSystems
- "The Embedded Systems Authority"
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