Ram - HP 9000 Series 310 Service Information Manual

This processor is the same as the 98561-66511 except for RAM and video circuits. 1 M-byte of
RAM is on-board but no video circuits are available. A video board or card must be installed
in a system or accessory card slot for use with a monitor.
RAM
One M-byte of RAM is contained on the 98561-66513 board. This RAM functions the saIne as
the 98561-6()512 board.
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Functional Description