turnera@pur-ee.UUCP (Allen Turner) (07/31/85)
My fiancee has a pcjr with a Tecmar jrCaptain board. The
jrCaptain has 512K of ram so she has a total of 640K in her system
Tecmar includes a program called CONPCJR.EXE that allows the jr
to utilize the expanded memory. Below is an excerpt from the
jrCaptain installation manual:
"Software Configuration
Recognition of Expanded Memory
When the IBM PCjr is running MS-DOS, Dos will not automatically
recognize more than 128K bytes of memory. The problem exists
because the IBM PCjr uses up to the last 32K bytes of the first
128K bytes of memory for the video screen buffer. Additional memory is
placed after the first 128K bytes and therefore, after the video
screen buffer. Alas, the screen buffer proves too hard a problem
to overcome and the additional memory is left abandoned and unused
(A memory map is shown)
A program has been developed to allow the additional memory to be
used...."
it goes on to say that CONPCJR must be the first line in the
autoexec.bat file.
The manufacturer of your friends card should have provided
a similar program.
Good luck
P.S. I would like to add that I'm not at all impressed with Tecmar.
Elaine's jrCaptain was purchased with 128K (2 banks of 64K rams).
The documentation stated that the 64K chips could be replaced with
256K chips if a jumper were removed. The 256K chips were ordered
and when they arrived I was much surprised to find the 64K chips
soldered instead of being socketed as the documentation indicated.
I called Tecmar, they told me that the documentation I had was
obsolete, you could no longer replace the 64K chips with 256K chips.
However, they offered to replace her board with one with sockets
but they would need to find out if any were immediatly available
and get back to me.
It took 10 (ten) LONG DISTANCE telephone calls, with much time
on hold, to get everything straightened out. When the board arrived
the doccumentation said to remove jumper 4. There was no jumper
marked 4, I guessed and got it right.
All seems to be working fine but I expect more from a company
than I got from Tecmar. Their technical support phone lines were
mostly busy, you could then leave a message but they didn't respond
promptly (i.e. the same day) unless I got nasty and their documentation
was "obsolete" and incorrect.
They could have done much better.
Allen Turner