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16 kb RAM for the HP-85A 
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EBTKS can be configured in the CONFIG.TXT file to provide 16 kb of RAM
in the upper part of a HP85A computer (and probably also HP83).

The manufacturing test program EBTKS-TEST that is run on every EBTKS prior to
shipment requires over 16 kb memory that is built-in on HP85A and HP83. Thus,
this 16 kb that can be provided by EBTKS is always enabled for HP85A and HP83.
On these computers, if you have a 16 kb card (82903A), it should be unplugged
prior to installing EBTKS.

This capability should not be enabled in HP85B, or HP86/87 as they
already implement this memory area.