Table of Contents
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The following sections describe the individual components of the PCM-4330 sin-
gle board computer.
A 32-bit CPU from the Intel i486 family is used. The PCM-4330 may be fitted
with a 486SX, 486DX2, or 486DX4 processor.
All these processors feature:
Separate address and data bus
Extensive instruction set, downward compatible to the 8086 set
Integrated memory management (MM U)
Memory protection on 4 levels
Address space of 1 MB in Real Mode
Physical addressable address space of up to 4 GB in Protected Mode
The processor can be operated in Real Address Mode or Protected Virtual Mode.
After a reset, the processor resumes operation in Real Mode.
Memory on the PCM-4330 consists of ROM and RAM area depending on the
board configuration, ROM memory size is 128 kB to 4 MB. 128 kB are located
below the 1 MB and 4 GB address boundary. It is therefore available twice (mir-
rored). A socket is used for ROM memory modules with a 8-bit word width con-
taining a 29F010 (128 kB), 29F020 (256 kB), or 29F040 (512 kB) Flash-Memory.
Alternatively, a 28F016SV (I MB) or 28F032SV (4 MB) module can be used, which
also offers silicon disk capabilities. The BIOS software can be reprogrammed by an
auxiliary program during operation.
RAM is build up by two dynamic memory modules in sockets to offer 1 MB, 4MB
or 16 MB on-board. These RAM modules support an access width of 32 bit and may
be parity checked bitwise (optional).
Specific attributes can be assigned
to certain regions of RAM memory:
Enable/Disable Shadow
RAM
16MB
BIOS
1024kB
128kB
CHANNEL-I/O
896kB
128kB
Video-Buff er
768kB
128kB
640kB
DO S-area
enable/disable
RAM
enable/Disable
RAM
enable/disable
RAM
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