Prometheus CPU User Manual V1.44
Page 18
6. SYSTEM FEATURES
6.1 System Resources
The table below lists the default system resources utilized by the circuits on Prometheus.
Device Address
(Hex)
IRQ
DMA
Serial Port COM1
I/O 3F8-3FF
4
-
Serial Port COM2
I/O 2F8 – 2FF
3
-
Serial Port COM3
I/O 3E8 – 3EF
4
-
Serial Port COM4
I/O 2E8 – 2EF
3
-
Parallel Port LPT1
I/O 378 – 37F
7
3
IDE Controller
I/O 1F0 – 1F7
14
-
Floppy Controller
-
A/D Circuit (PR-Z32-EA only)
I/O 280 – 28F
5
-
Ethernet I/O
1000
10
-
USB
11
-
6.2 CPU Chip Selects
The ZF Micro CPU chip contains 4 user-configurable I/O chip selects and 4 user-configurable
memory chip selects. These chip selects are visible in the BIOS setup screens. Three of the I/O
chip selects are used by the Prometheus design. Chip selects 1 and 2 are used for the two serial
ports COM3 and COM4. Chip select 3 is used by the data acquisition circuitry on model PR-Z32-
EA. Chip select 0 is not used.
Chip Select
Function
Mode
Address Range
I/O Size
Window Size
0
Not
used
-- -- -- --
1
COM3
R/W
3E8 – 3EF
8 bits
8 bytes
2
COM4
R/W
2E8 – 2EF
8 bits
8 bytes
3
Data Acquisition
R/W
280 – 28F
8 bits
16 bytes
These chip select settings should not be modified
unless you need to change the addresses
of one or more of the affected circuits for a special system configuration and are fully aware of the
impact of your changes.
