4.5
Non-Bootable Flash Disk Usage
The AT MEL 5 volt Flash Part (29C040/29C040A) may also be used as a non- bootable
drive in a man ner nearly iden ti cal to the RAM DISK us age de scribed in the pre vious
sec tion. The only change when us ing USSD for the AT MEL PEROMs is the ad di tion of the
/EPT:256 pa rame ter to the CON FIG.SYS line which in stalls the USSD driver. An
ex am ple us ing the 512K PEROM de vice would need the line :
de vice = ussd.sys /mod:p /pad:1ec /seg:e800 /psz:32 /inc:1 /spg:80 /dsz:512 /ept:256
in the CON FIG.SYS file on the floppy or hard disk. This in vo ca tion will cre ate a 512K
Flash disk in U3. Ref er to the pre vious sec tion on non- bootable RAM DISK us age for
ad di tional de tails re gard ing the USSD driver.
4.6
DiskOnChip Usage
The PCM- 586 sup ports the M- System’s Disk On Chip (DOC) Flash de vice in sizes
rang ing from 2MB to 72MB. The DOC de vice con tains a BIOS ex ten sion, the TrueFFS
(True Flash File Sys tem), and the flash mem ory all in a sin gle 32- pin de vice. The DOC,
un like the other Win Sys tems SSD sup port for the PCM- 586, emu lates a hard disk rather
than a floppy disk. The DOC can be used as a sec on dary hard disk to a physi cal IDE drive
or it can be the only hard disk in the sys tem.
The DOC is in stalled into the socket at U3. Ref er to Sec tion 2.15 for cor rect de vice
jump er ing and ena bling of the DOC.
4.6.1
DOC Initialization
The DOC is ini tial ized in an iden ti cal fash ion to a fixed disk. DOS is booted (from
floppy or hard disk), FDISK is run on the DOC drive (be sure to get the right drive), the
sys tem is re booted and then the DOC is for mat ted us ing the DOS for mat com mand.
If the /S switch was used dur ing for mat ting and there is no other fixed disk de vice
speci fied or at tached to the sys tem, the DOC will be come the boot de vice. If a hard disk is
pres ent, the DOC will be come a sec on dary fixed disk.
Page 4-6
OPERATIONS MANUAL PCM-586
021402
WinSystems
- "The Embedded Systems Authority"
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