Diamond Systems PR-Z32-EA-ST, PR-Z32-E-ST System Features, System Resources, CPU Chip Selects

6. SYSTEM FEATURES

6.1System 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	-

6.2CPU 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.

Prometheus CPU User Manual V1.44 Page 18