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Macintosh Plus Internal Hard Drive Mod

Macintosh Plus Internal Hard Drive *Mod* Hardware 171 posts Oct 10, 2012 — Jul 4, 2019

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#151 Sat, 1 Dec 2012 - 06:47

. . . are the pictures still relevant and needed?

Oh yeah!!!!! :approve:

#152 Sat, 1 Dec 2012 - 06:54

Where would you get new SCSI chips?

#153 Sat, 1 Dec 2012 - 07:10

They're available from an Amiga oriented site (IIRC) that somebody linked to as a source for a SCSI interface PCMCIA and Chiplet Reader Box . . . hrmmm . . .

< scampers off to search bookmarks for "SCSI" heh! [

] ]'> >

http://a4000t.com/store/index.php?main_page=product_info&products_id=180

SCSI Chip $15

Gotta find a Datasheet to check it against the devil we know, though. :beige:

#154 Sat, 1 Dec 2012 - 07:57

i just saw'd my scsi chip out and its doing the same thing... boots to a point and locks up... when i hit the program button it will not let me type.

#155 Sat, 1 Dec 2012 - 16:53

8-o Woooo . . . and here I thought I was quite a bit more impatient than the average hacker! You win!

I'm surprised you're even getting as far as :?: in the boot process after that impromptu organectomy!

Sounds like you may have been hit by a random static discharge incident while playing with the toys? How careful were you about avoiding that. I pretty much ignore the possibility other than grabbing everything by a plastic connector or mounting point attached to the ground plane as a matter of habit.

I ALWAYS have skin contact between the hand/wrist/arm that touches the card and the chassis or PSU case during swapouts.

I've got a galvanized steel pan set up as my soldering workstation, but I haven't got around to grounding everything properly or connecting the wrist strap that's still in the envelope.

#156 Sat, 1 Dec 2012 - 18:19

Well mcdermd and I were talking about de-grading this machine back to its original 128k glory anyways.

now seems like a good time to get on it

I'm still angry this plus board is screwed, but oh well. My normal success rate when fixing/moding things is extremely high.

#157 Sat, 1 Dec 2012 - 18:43

Now THAT sounds like a great project! :approve:

I'm putting the PCB back on simmer. Can anyone verify that the Controller I linked is pin compatible with NCR 5380?

#158 Sat, 1 Dec 2012 - 19:51

Woooo . . . and here I thought I was quite a bit more impatient than the average hacker! You win!

Yeah, if I was a Mac at Uniserver's house going to be opened up, I would be scared. :I
Here's another config example that could work if there is room. You would still need to desolder the chip and install a socket though unless you can reach the back pins that need a connection.

#159 Sat, 1 Dec 2012 - 23:20

I get farther then that,

I put the 6.0.8 disk in ,,, it starts to boot

it says Welcome to macintosh, and starts to load i can hear floppy disk access, but then it stops after about 4 seconds, and nothing. sits there.

Any idea what is causing it? originally i thought i was a bad scsi chip that was why i saw'd it out.

or do i have to take the board out back and pump a couple buck shots into it ? :-D that'd be more fun!

#160 Sun, 2 Dec 2012 - 19:07

Hope this helps. Just slided the board to get slighly better shot out of it. It's tight packed with power connector, hdd power connector and the opened up scsi cable with the leads soldered on the chip. Would be risky to pull the whole board out. If you want higher resolution picture, PM me.is mi

Edit: Aww.. might need to take another one, difficult to see where the stripes of scsi wiring goes! :disapprove:

#161 Tue, 12 Feb 2013 - 20:25

Ok, finally.. Here are better pictures. That is quite a tricky to open up, those cut-wires are bit in a tight fit from the board to connector. Not much space around. Hope these provide any help. If you need original 18Mpix images, PM me with email address.

#162 Tue, 12 Feb 2013 - 20:27

Some modification made on the analog-board.

#163 Tue, 12 Feb 2013 - 20:34

Thank you for those awesome pictures sir!

Hey so it looks like the only A/B mod is a Different / Larger Capacitor? @ C1

#164 Mon, 13 May 2013 - 19:29

I'm real close to giving this another try!

After doing all these Macintosh Portable HD cables… I now know, and understand the grounding situation a little better !!!

Also i am still going to use a external PSU to power the hard drive,

I have 2 12v pie fans I am going to mount, those will also be powered from the external psu.

#165 Tue, 14 May 2013 - 00:44

You could tap into the A/B's AC in port (just past the switch) and run everything off one cord (and have it switch on and off with the machine as a bonus).

Also, an uninformed person would never know it's been upgraded, because there wouldn't be any outward signs of it.

c

#166 Tue, 14 May 2013 - 01:03

yup that is what i did with my Macintosh classic already

its in the first post of this thread

#167 Fri, 6 Sep 2013 - 19:53

by the way i ended up replacing the caps on my Macintosh Classic A/B and it now supplies enough power for the internal hd.

viewtopic.php?f=7&t=21471&start=0

so i would assume to beef up the PSU in the plus, larger caps would have to be installed.

#168 Fri, 6 Sep 2013 - 20:58

yup that is what i did with my Macintosh classic already

But doesn't the Classic already have provisions for an internal HD?
c

#169 Fri, 6 Sep 2013 - 21:24

Yes, and you didnt read my first post of this thread.

10 Oct 2012, 13:15

i've already done this hack to my Macintosh Classic, because i am to lazy to replace the analogue board,the analogue board was not making enough power to spin up the hd, so i added my own,