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Prometheus-LC CPU User Manual V1.0 Page 16
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 -
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. I/O chip selects 1
and 2 are used for the two serial ports COM3 and COM4. I/O chip selects 0 and 3 are 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 Not used -- -- -- --
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.