Hello this is a crosspost from another site (68kmla), We know that the TechStep was a short lived but very useful tool and it can test many components and issues on these Old Macs. A team of three people have made all of this possible. Below you will find a .zip file containing all of the resources, build guides, documentation, .stl files for the 3D printable cases, as well as the ROM images and boards themselves. Each category has been broken down into folders for your use, enjoy!


*Update Rev.4 has had Gerber files placed in separate folders for easier understanding, a newly included build guide, and a new parts list folder, also included is JDW's 4th ROM Label*




Creators of this project are @jajan547, @Elemenoh, and @SuperSVGA

I think this is an amazing project. @jajan547, you are to be commended for spearheading it!

For those of you who don't already know what the Apple TechStep is, please know that I made a video about it here.

Since there haven't been any posts under this thread since it was started in March this year, I am curious...

How many of you own a TechStep or want to buy one some day?

>> JDW said:

I think this is an amazing project. @jajan547 , you are to be commended for spearheading it! For those of you who don't already know what the Apple TechStep is, please know that I made a video about it here. Since there haven't been any posts under this thread since it was started in March this year, I am curious... How many of you own a TechStep or want to buy one some day? Click to expand...

Thank you I really appreciate it, everyone has worked hard on this. I wanted to win a prototype to see what all is different on the prototype ROM's and units but I imagine very little change except for maybe the devices name which was originally the TechTool before being replaced with TechStep. Sadly I did not win it so the hunt will continue. Another thing I find unusual is that these were sold outside of the USA so that being said I'd imagine there would be ROMs that cover the Color Classic ii officially since it coincided with the Color Classic production, I'd like to track down one of these international models and/or ROMs.

Hey, I'm based in Australia, and recently acquired a TechStep (and commented on the other site). Haven't used it in anger yet, but looking forward to having a play with it.

>> pocketscience said:

Hey, I'm based in Australia, and recently acquired a TechStep (and commented on the other site). Haven't used it in anger yet, but looking forward to having a play with it. Click to expand...

Do you happen to have photos and also what ROMs were included?

I don't suppose there will ever be a way to purchase a kit to make one's own TechStep instead of trying to find an old one?

>> lilliputian said:

I don't suppose there will ever be a way to purchase a kit to make one's own TechStep instead of trying to find an old one? Click to expand...

Probably not too terribly difficult, might have custom chips though, I can take mine apart and see.

>> jajan547 said:

Do you happen to have photos and also what ROMs were included? Click to expand...

No photos handy, but came with:

* CPU Tests Vol 3, v 1.0
* CPU Tests Vol 1, v 1.1.1
* SCSI HD Tests, v 1.0

So nothing fancy or interesting from what I can tell..

>> pocketscience said:

No photos handy, but came with: * CPU Tests Vol 3, v 1.0 * CPU Tests Vol 1, v 1.1.1 * SCSI HD Tests, v 1.0 So nothing fancy or interesting from what I can tell.. Click to expand...

These ROMs match the same computers covered in the ROMs I have here, correct?

>> jajan547 said:

These ROMs match the same computers covered in the ROMs I have here, correct? Click to expand...

Correct, they match what's in the archive.

High resolution images of the 4 cartridges I own are shown at the 3:20 timestamp in my video.

Specifically, I own these:

• CPU Tests Vol 1, v 1.1.1
• CPU Tests Vol 2, v 1.0
• CPU Tests Vol 3, v 1.0
• SCSI HD Tests, v 1.0

I only lack CPU Tests Vol 4, which covers the LC III, LC 520, Color Classic, and Performa 250, 450, and 520.

Also be sure to check out Apple's official intro video of the TechStep, which to my surprise still has a shockingly low number of views on it...

I've watched that vid before - it's probably the slickest video you'll find for a tool like this!

>> JDW said:

Also be sure to check out Apple's official intro video of the TechStep, which to my surprise still has a shockingly low number of views on it... Click to expand...

Love this, thanks for the link.

>> pocketscience said:

Correct, they match what's in the archive. Click to expand...

Wonderful, strange Apple stopped sometime in 1993 with support would be my guess.

I have often looked at ebay and almost got a techstep. but never made that leap. I would totally want one..

I have thought about making one myself. LIke a simple one, not even try to clone techstep. But some way to hook up your mac to a RePi or an Arduino one. even if all it did was look at the volt readings on some pins. and then just add features as you go on.

That is to say. start from scratch and build it up over time.

Anyways. neat project. would be neat if we can come up with a way for people get get one without buying a used one.

>> Patrick said:

I have often looked at ebay and almost got a techstep. but never made that leap. I would totally want one.. I have thought about making one myself. LIke a simple one, not even try to clone techstep. But some way to hook up your mac to a RePi or an Arduino one. even if all it did was look at the volt readings on some pins. and then just add features as you go on. That is to say. start from scratch and build it up over time. Anyways. neat project. would be neat if we can come up with a way for people get get one without buying a used one. Click to expand...

PM me let's design one.

Okay so here's something interesting, I disassembled the TechStep and have taken photos. From what you can see there are no SMD electrolytic capacitors ,they are all tantalums stock from Apple. Also fun fact the TechStep has a FPU it is a Motorola 68882. Something else I want to point out is there are no custom chip markings meaning Apple essentially didn't bother hiding original chip names. I bring this up because the chip circled when compared to an EGRET (also circled ) from a LCII motherboard its the same exact package and style, not sure if it's totally different but very similar. Anyways I hope everyone enjoys these photos and gets good use out of them.

No, the HM62256 is a 32kB static RAM.

Is the FPU the yellow labelled chip? Possibly it asks the logic board to do calculations and compares them to what this one gives.

The 68HC24FN is an evolution of the HC05 uC used as EGRET, likely one is wired to the sram and cartridges. Maybe it's possible to dump their ROM, not sure. There's also a registered PAL to dump...

Oh the gerbers are for the ROM cartridges, thought it was for the whole thing. Still useful I suppose.