640K expansion set up Dos 3.3

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640K expansion set up Dos 3.3

Postby pzsjgkz » Tue Oct 24, 2017 1:27 pm

So here I am trying to get a PCJ set up. I have a working 640K side car and my memory is getting long in the tooth. I was 16 when I did this last. I remember having to set MEMSYS ? or HIMEM? in dos so that it recognized the memory over 256K. If any one can guide me that's awesome.

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Re: 640K expansion set up Dos 3.3

Postby Brutman » Tue Oct 24, 2017 1:39 pm

What you are looking for is jrconfig.sys, or a similar memory manager designed for the PCjr. Jrconfig forces the BIOS to report the extra memory to DOS; anything above 128K is considered extra.

See http://www.brutman.com/PCjr/pcjr_downloads.html for a link to jrconfig.
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