Mac Portable Peripherals - Schematic Development

[Trash80toHP_Mini]

Thanks to a post by @techknight somewhere I had the connector pinout from the Schematics to begin with.





Up front, started late last night. Working from the solder side of the KBD, trying to match the pinout to the connections GND seemed wonky, the MODIFIER  connections weren't making sense and it was making me crazy. Turns out pin 27 GND is discrete network setup for the modifier keys: GND_MOD on my pinout. It didn't help that some of the keys were being pressed all the while so I thought I'd take a look at the trackball I'd ignored as I knew it was ADB. The Numeric Keypad was more interesting. Guess where pin locations for 1, 2, 33 and 34 for the solder side view are etched?  I went to bed.

 

[Trash80toHP_Mini]

Forgot the worksheet with tab delimited text. Anybody got a notion for an LED setup to light up X and Y coordinates when a key is pressed on a an 8 x 12 matrix? Pretty sure there's something to work from in the TTL Cookbook, but I know somebody out there can knock out a diagram with their eyes wide shut. :blink:

edit: never mind, that'd be more work than just doing it with the continuity tester, but one can wish  .  .  .  so long as they're not horses.

 

[Trash80toHP_Mini]

View attachment WKSHTS-SE30P-KBD-01.PDF

 

[Trash80toHP_Mini]

View attachment WKSHTS-SE30P-KBD-04.PDF

 

[Trash80toHP_Mini]

 

[ScutBoy]

Those pics are exciting and kind of scary at the same time

 

[LaPorta]

So, what exactly are you doing here? Sneaking in a stealth computer into the shell of a Portable?

 

[bibilit]

iBook / PowerBook Logic board ?

 

[Trash80toHP_Mini]

< Shakespeare in Love >

  It's a mystery.

< /Shakespeare in Love >



One possible setback, but I got a full refund and don't have to send it back. This board's not the destination, it's but the beginning of a journey.

This weekend it's time to troubleshoot my NumPad and run the main KBD through the Buzzomatic™ to determine the switch matrix. ILikeTech is patiently awaiting that data for Arduino development. I'm then on to beating my brains out on the LCD interface section of the schematics  .  .  .  likely to no avail. :

I didn't think anyone had noticed this thread?

 

[Trash80toHP_Mini]

NumPad Matrix in the can:

 

[Trash80toHP_Mini]

The Buzzomatic™ rocks! Just 37 minutes to map X and Y coordinates of the KBD switch matrix, checking the bit I'd done haphazardly along the way. MOD_GND<->Modifiers don't count, that was easy once I figured out that Pin 27 was a discrete logical ground for the Modifiers. 

I've held onto this test riser(?) snagged out of a junk bin at TRANS-AM Electronics down on Canal Street for over 30 years. Has anyone got a clue as to what ancient HP machines used this bus? Looks like a stone age VMEbus? Only hits I got were from Aviation Part catalogs. Edgecard connectors are too far apart and the pitch doesn't look narrow enought for PDP-8 Bus I think? Who knows, HP made EVERYTHING electronic in the day, on and off the ground, on and under the water and I can't believe they've not been a big part of the space program.



X grid shorted, buzzing for Y values:



Y grid shorted, buzzing for X values:



Keyboard/NumPad schematics complete, it's on to driving the (an?) LCD! :approve:

 

[Trash80toHP_Mini]

Here we go:



I think this one may deserve its own thread?

 

[Trash80toHP_Mini]

Time to come clean now that @IlikeTech has received the handoff. It really shouldn't be much of a mystery. ***** :wink:

Those pics are exciting and kind of scary at the same time

Indeed they do look a bit foreboding. The edges of my plexi logic board stand in do give it a sort of graveyard headstone effect. I think it's an exciting project.

So, what exactly are you doing here? Sneaking in a stealth computer into the shell of a Portable?

Yep, but not this one in the long run.

***** I've been pushing hard for a custom SE/30 board in the Portable's form factor. I'm trying to drum up some interest in that project for populating mausoleum plastics for Cap dissolved Portable logic boards.

iBook / PowerBook Logic board ?

It's the board from my 12" PartsBook AL board standing in for fitment testing before ordering the 1.5GHz variant with its far superior graphics chipset/doubled VRAM complement. I can fit just about any Pi related LCD panel/controller bundle behind a custom clear plexi bezel as an absurdly over-spec demo unit. I need help (LOTS OF IT!) figuring out how to drive the OEM LCD from an 030 PDS VidCard.

It shouldn't be hard to come up with a variant of the fully documented Xceed SE306-48 to push only the Portable's 640x400 resolution rather than its native 640x480. 640x400 is hella' better than the SE/30's CRT, even if "only" in B&W rather than Grayscale, to my Pixel obsessed mind anyway. I've found 10.1" 1280x800 panels that just quite, but not quite right enough to fit an unmodified Portable's bezel opening. You'd loose a few pixels off to the sides and bottom to go Full Color SE30 Portable. I'd apply V-bit/router to mine in a heartbeat, but the spec is for a fully reversible, no modification setup. If @techknight finds time to reverse engineer his borken hybrid, a new Portable PCB can't be all that far of in the future. Development here appears to be accelerating exponentially.

ColbyMac SE30 is the inspiration, it sold well even after the portable was released with the SE/30's power even at its lower resolution and only a 3 hour battery life. Who needs a battery today anyway?

If the KBD cabling and converter hardware fit snugly between the KBD PCB and case bottom as planned, there's quite a bit of of PCB real estate freed  .  .  .  and cubic/openings for a pair of stereo speakers. [}]