🚀 go-pugleaf

In article <934@swisun.swivax.UUCP> jansweij@swivax.UUCP () writes:
>I can buy 2 MByte memory expansion (2 SIMMS, low-profile, 100 nsec)
>for a good price.
>
>   o  Can I mount them myself in my Mac+ ?
>   o  Which two 256K memory chips do I have to remove?
>   o  Do I have to set some dip-switches?
>   o  Do I need to re-adjust the voltage-level?
>   o  What pre-caution (static electricity) have to be taken?
>   o  Is there an Apple-technote that descibes the procedure?
>   o  ... ... ... etc
>
I've seen 2 such messages so here's a post of the reply rather than mail.

procedure...
1) buy an earth strap (folklore but who dares go against that!!),
	   a long handled allen-key of the type that will fit into the
	   "star" screws on the mac (apple will sell you a "star" key for
	   about $50 - the allen key can be bought for about $5) and a
	   case cracker (the case cracker can be done without if you dare
	   to face the mac on its screen and shake it as you pull up on
	   the case with ALL 5 (yes 5) screws undone (2 screws under the handle,
	   2 in plain sight and 1 UNDER the battery flap (crafty apple)).
2) undo screws
3) pry off programmer buttons (they will crease the mother-board
   protector paper).
4) pull case from rear of machine with screen face down (case cracker
   comes in useful here) the plastic/foil mother board protector may fall off
   at this point - take it off anyway and save for reassembly.
5) mother board is the board nearest the base of the machine. Pull off 2
   cables attached to mother board (1 = floppy 2 = power - note which way
   they should go back on (no harm in being careful))
6) carefully slide out mother board towards the rear of the machine (NOTE
   if you have an accelerator board you won't want to slide this board anywhere
   since it will probably scrape off the add-on board (not much clearance)).
7) with the board chips up and the external plugs nearest you (rear of the
   board), the simms are far away from you mounted at an angle to the
   horizontal with side-catch fasteners. Remove the 2 simms nearest you
   (the 2 nearest the center of the board)
8) replace these with new simms (chip side up, board notch same as all
   the other simms).
9) locate and remove the resistor jumper marked 256kbit which will be towards
   the right side of the board if the previous orientation (back towards you)
   is maintained. The jumper is about 1/4 of the board length away from you.
10)All done - slide mother board back in, replace plastic/foil protector,
   connect 2 leads, slide case back on (careful - no force is necessary here
   if it seems to stick then find out why and correct), replace screws (you
   should still have 5!!), replace programmer switch and power-up.

NOTES:
1) do not be alarmed if 10-15 secs go by before the grey screen becomes
   the smiley face - testing 2.5Mbytes take a while
2) simms must be fitted in like pairs - start with 4*256k = 1M, upgrade to
   2*1M + 2*256k = 2.5M or 4*1M ( = 4M). I don't believe any other combinations
   are legal.
3) replacing memory is fun - it'll take 10 mins or less when you've had some
   practise.
4) if the smiley face is bordered by a black screen then you forgot to remove
   the resistor jumper (or snipped the wrong one - woops). (the former should
   not cause any damage, the latter is anyone's guess).
5) I replaced my memory while wearing an earth strap I suggest you do the same
   just in case the folklore is soundly based.

DISCLAIMER - (guess what comes here). Sorry if I got it wrong guys - I don't
believe I did - I've done it a load of times now with no problems but I won't
be responsible for problems due to following these instructions which are
given in good faith etc etc.

--alen the Lisa slayer (it's a long story)
	....ucsd!ncr-sd.uucp!asdev2!alen