Re: Need slot mover; where to find parts?

[gberigan@cse.unl.edu (Greg Berigan)]

gdr@eddore.myrias.com (Devin Reade) wrote:
>[trimmed out of message] wrote:
>>Greg Berigan <gberigan@cse.unl.edu> wrote:

>>>Does anyone (1) have part numbers for these things so I know what to ask
>>>for when I go to/call the electronic stores here or (2) have a Slot
>>>Mover for sale cheap?

>Actually, Greg is referring to the SlotMover accessory for the
>RamKeeper.  This card sits horizontally, is the width of the memory
>bus connector and about 7cm long.  Normally a card attached to the
>front of the RamKeeper blocks slot 7, and must be GS-RAM+ compatible
>(for the connector).  The SlotMover allows an offset in the machine
>but, if memory serves, the moved memory card will block both slots
>4 and 5.

It is also necessary to connect an OctoRam card to the Ram Keeper card
as it is too thick to fit in the "back pocket" card-edge connector.  I
have a similar problem with my Q-RAM GS card which is of similar
structure.  My GS RAM III card will work on the front connector, but the
Q-RAM barely fits in the back pocket between the Ram Keeper and case
(plus that I'm missing the insulator and am using a bit of cardboard
taken off a box formerly containing a bar of soap).  I'm sure the cards
and slots are being subjected to undesirable stress right now.

The size of the cards though are pretty small, so even if I did have a
card in slot 7, it would need to be almost full length to bump into the
GS RAM III.

Actually, I'm not even sure the GS RAM III will fit as it uses ZIP, not
DIP, chips which stick out from the card.  (Also would like leads on
finding more of those chips to fully populate my GS RAM III to 4 MB.)

>I don't know the proper term for the inline connectors, but they
>match the black front connector on the RamKeeper, except that they
>have fewer pins (the RamKeeper has hole plugs in its front connector
>to ensure proper alignment).

If I could just find out what the part numbers for those were (and where
I could get them, and AE isn't around anymore to provide either), I
could wire up the back connector to a ribbon cable and drape it over the
Ram Keeper and GS RAM III and suspend the Q-RAM card over the front of
them both, like so:

  +-- Back pocket (44-pin card-edge connector, small printed circuit
  |      board, and 56-pin connector) connected to 56-pins of ribbon
  v         cable
  _|=---\  
 |,| | | \ <-- Ribbon cable draped over cards
  |\C| | |
  |\ | | |
  |\ +=|=+
  |\ '|_| 
         ^
  ^^ ^ ^ |
  || | | +-- Ribbon cable plugged into back pocket 56-pin connector
  || | +-- GS Memory slot containing Ram Keeper
  || +-- GS RAM III in front 44-pin connector
  |+-- SIMMs in Q-RAM card
  +-- Q-RAM card

I could possibly save myself some parts by making a new stiff card to do
the same thing which would plug into the back pocket and sacrifice the
"Flex Connector", but I both cannot find card stock of the proper size
and rather not ruin the flex connector. :-/

>The wiring on the PCB appears to be straight-through except for pins
>5, 7, 29, 35, and 37 which each have a 56-ohm 5% 1/4W resistor wired
>inline.

Sounds like that's to boost the voltage from the 44-pin connector to the
44-pin card-edge connector.  The voltage from the connector on the Ram
Keeper's front might be lower than that on the back used with the back
pocket card-edge connector, which I don't see any resistors on.

(Too bad we don't have a comp.sys.apple2.hardware group.)

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