Octagon PC-500, Руководство пользователя

Страница: 84 / 233

8-3
PC-500 user’s manual SSDs, DRAM, and battery backup
SSD0 replaced with an EPROM/OTPROM
1. Follow steps one through three in the SSD0 replaced with a flash device
section and use a 512K flash.
2. Power off the PC-500 and remove the flash from socket U21.
3. Use an off-card programmer to program a 512K EPROM/OTPROM.
Use the flash as the master copy.
4. Insert the programmed EPROM/OTPROM into socket U21.
5. Remove jumper W2[7-8] for EPROM USE.
6. Power on the PC-500.
7. The new SSD0 device is now ready to be used as a bootable, read-only
DOS drive.
≡
SSD1
Generally, SSD1 is meant for storing the application programs to be
executed on powerup. The programs are automatically loaded into DOS
memory and executed. The standard version of the PC-500 comes with
a 2 MB flash soldered on-board, while the optional version contains a
1 MB flash soldered on-board. Your application programs can be saved
to flash using the PICO FA driver which makes the flash device a read/
write disk on your PC-500. Saving your programs onto the read/write
disk allows you to do this up to 100,000 times, allowing updates to your
application programs. These devices are erased automatically during
the programming process.
SSD1 can be accessed directly as a read/write DOS drive with the PICO
FA driver. Also, it can be accessed directly as a read/write DOS drive
when the PICOFA.SYS driver is loaded. While this is convenient for
product development, the flash, however, has a limited number of writes
allowed. Therefore, Octagon does not recommend SSD1 be used as a
data logging device. Refer to the Software utilities appendix for infor-
mation on supported flash devices and a description of PICO FA.
≡
DRAM
The standard version of the PC-500 is shipped with 1 MB of DRAM
on-card. The PC-500 can also be configured with 16 MB of surface
mounted DRAM. The on-card DRAM socket holds up to a 32 MB dual
in-line memory module (DIMM). The card supports fast page mode
(FPM) or extended data out (EDO) types of memory. These can be
symmetric or asymmetric configurations. You may order EDO DIMM
memory modules from Octagon Systems. These memory modules,
including a 32 MB version, are also available from third party electronic
component distributors. See the following for ordering information:
Description Manufacturer Manufacturer’s P/N
4 MB EDO DIMM Octagon 4583
memory module IBM IBM11S1325LPB-70
Kingston KTM1X32V-70DEG
PNY Engineering 321007EDM1G02TB