HMB-16/20 Memory card Settings and Configuration

Card Type	Memory
Chipset/Controller	N/A
I/O Options	None
Maximum DRAM	8MB (4MB on HPB supplemental memory card)

STARTING ADDRESS
Address	JP1
1.25MB (1MB system RAM)	Pins 1 & 2 closed
4.25MB (4MB system RAM)	Pins 2 & 3 closed

PARITY CHECK
Enabled		JP2
»	Enabled	Pins 2 & 3 closed
	Disabled	Pins 1 & 2 closed

MEMORY SIZE
Size	SW1/1	SW1/2	SW1/3
2MB	On	On	On
4MB	Off	On	On
6MB	Off	Off	On
8MB	Off	Off	Off

MEMORY READ/WRITE TIMING
Card Model/System Speed		SW1/4	TP1
»	HMB-16/100-ns	On	Pins 4 & 9, 3 & 8 closed
»	HMB-20/85-ns	On	Pins 4 & 9, 1 & 6 closed
	HMB-16/85-ns	Off	Pins 4 & 9, 3 & 9 closed
	HMB-20/100-ns	On	Pins 4 & 9, 1 & 6 closed
Note: SW1/4 in the on position enables the zero wait state.

DRAM CONFIGURATION
Size	Bank 0	Bank 1	Bank 2	Bank 3	Parity Bits
2MB	(16) 514256	None	None	None	(8) 511000
4MB	(16) 514256	(16) 514256	None	None	(8) 511000
6MB	(16) 514256	(16) 514256	(16) 514256	None	(8) 511000
8MB	(16) 514256	(16) 514256	(16) 514256	(16) 514256	(8) 511000
Note:(1) Banks 2 & 3 are located on the HPB daughter card.
(2) The HMB-16 uses 100-ns 514256 RAM chips and 100-ns 511000 parity chips.
(3) The HMB-20 uses 85-ns 514256 RAM chips and 85-ns 511000 parity chips.

MISCELLANEOUS TECHNICAL NOTES

The HMB-16/20 is for use only in Acer interleaved-memory systems.