gpw@ihdev.UUCP (G. P. Wilkin) (10/19/86)
{I'm posting this for those who might want to know, thank Mike for the hard
work ---gpw}
2meg and above------------------------------------------
PC6300 PLUS Users/abusers:
I just got an "Enhanced Memory Expansion Board" and ran into some
confusion installing it in my PLUS running UNIX. Here are a couple
of tips for installing this board.
First, if you haven't already, install 256k chips on the motherboard
to bring it up to 1meg. Plug in the chips and change SW2
positions 1 thru 4 from on-on-on-off to off-off-on-off.
Second, install the extra 256k chips on the memory expansion board
to bring it up to 2 meg.
Third, set the dip switches on the MEMORY board as follows:
+--------------------------------+
on | x x x x x x |
SW1 | |
off | x x |
+--------------------------------+
1 2 3 4 5 6 7 8
+--------------------------------+
on | x x x |
SW2 | |
off | x x x x x |
+--------------------------------+
1 2 3 4 5 6 7 8
Fourth, make sure the JP1 jumper on the memory card is set for the PLUS.
The top two pins should be closed, the bottom two should be open.
Lastly, note that UNIX will recognize the memory automatically.
Feel free to call if you have any questions.
Mike Vrbanac
CB Product Center
cblpe!gmv
2meg and above------------------------------------------
PC6300 PLUS users:
Here is how to get your PLUS up to three, five or seven megabytes
of memory using AT&T's "Enhanced Memory Expansion Boards".
First, if you haven't already, install 256k chips on the motherboard
to bring it up to 1meg. Plug in the chips and change motherboard
SW2 positions 1 thru 4 from on-on-on-off to off-off-on-off.
Second, install the extra 256k chips on the memory expansion board(s)
to bring it/them up to 2 meg.
Third, make sure the JP1 jumper on each memory card is set for the PLUS.
Fourth, set the dip swtches on the FIRST memory board as follows:
+------------------------+ +------------------------+
on | x x x x x x | on | x x x |
SW1 | | SW2 | |
off | x x | off | x x x x x |
+------------------------+ +------------------------+
1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8
Fifth, install this card in the slot on the left (closest to the video
board, reboot and make sure all is well.
Sixth, set the dip swtches on the SECOND memory board as follows:
+------------------------+ +------------------------+
on | x x x x x | on | x x x |
SW1 | | SW2 | |
off | x x x | off | x x x x x |
+------------------------+ +------------------------+
1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8
Seventh, install this card next to the first memory board,
reboot and make sure all is well.
Eighth, set the dip swtches on the THIRD memory board as follows:
+------------------------+ +------------------------+
on | x x x x x | on | x x |
SW1 | | SW2 | |
off | x x x | off | x x x x x x |
+------------------------+ +------------------------+
1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8
Nineth, install this card next to the second memory board,
reboot and make sure all is well.
Notes: -UNIX will recognize the memory automatically.
-Currently the PLUS has three 16-bit slots, which limits it to
7 megabytes, 5 megabytes if you have a DEB board.
-To configure some "paged" memory for DOS to use, on the *last*
memory expansion board set SW2 positions 5 thru 8 to be something
less than 2048k. The difference will be available to DOS as
"paged" memory (whether native DOS or DOS under Simu-Task).
Mike Vrbanac
CB Product Center
cblpe!gmv
AST/AT&T Memory card with 6300 and V30 from NEC --------------------
6300 users:
Last week I posted a query to USENET regarding the fact that a PC6300 with
a NEC V30 cpu chip installed will not work with the AT&T 2meg Enhanced
Memory Expansion Board. I received the following explaination over the
weekend and wanted to pass it on.
Note: I always try to give credit where it is due, but I hesitate to mention
names without permission, because of the troubles it may lead to.
Mike Vrbanac
CB Product Center
cblpe!gmv
----------
Re: NEC V30 mutually excludes the AT&T 2meg expansion board
The AST software (as delivered) probes the V30 and sees what looks [to it]
like an 80286. It then decides that is is dealing with an ATT6300+
[and not a 6300] which has a different memory mapping.
AST informed me that the ATT powers that be asked that they construct
their software so that a single driver works on both machines. This is why
they do it that way. AST can supply a driver that will assume a PC6300
and not do the probe and this will work fine, but it is not released
and hence you will have to ask them.
At least I hope this will save you the aggravation of trying to figure
out what is going on.
--
George Wilkin AT&T Network Systems, Naperville, IL
!ihnp4!ihdev!gpw IH 4A-157 work 312-979-4317