Apple II

Apple II Single Stepper

Submitted by wishtoknow on December 11, 2016 - 8:25pm

Apparently this was used in test engineering.
In Ireland.
The single stepper was used in the rework area -
failed motherboard would be examined by the
technicians using the single stepper and
could determine the fault. (RAM, shorts, opens)

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Apple II

Apple II Rev 3 motherboard - Clone, prototype or what?

Submitted by snuci on December 9, 2016 - 9:37am

I acquired two interesting Apple II Rev 3 motherboards. One is a board that was thought to be a clone but I wanted to explore if it was actually a prototype. As with the Apple II Rev 0 prototype, one of the Rev 3 motherboards has no solder mask or graphics.

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Apple II

Apple IIc internal disk drive

Submitted by 6502enhanced on December 9, 2016 - 2:42am

Hi,

I just purchased a Apple IIc.

Everything seems to work well.

I tried the Apex II Apple II diagnostic from Asimov. Every test was successful - but the Disk PROM controller test was not.

I tried about 25 different disks and all are booting and working without problems.

So the question:

Is the Apex II test not able to test an Apple IIc internal disk drive? Which differences are between the Apple IIc internal disk drive and the Disk II?

Thanks!

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Apple II

Apple IIe Platinum getting RAM error when Disk II card inserted

Submitted by Anovah on December 8, 2016 - 7:22pm

I could really use some help with this IIe Platinum that I received as a donation since it was displaying garbage on the screen. I swapped the 6502 chip with an older IIe (which I hope is okay for testing. I also noticed the existing chip just says 6502 making me wonder if this was a donor board).

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Apple II

Apple IIGS Documentation

Submitted by wishtoknow on December 7, 2016 - 1:58am

There are a few places on the internet
in which you can obtain the schematic for
the IIGS. (ASIMOV, 1000bit.it etc)

This is not published in any IIGS that
I currently have find and it is leaving me
with questions.

I would like to find out the abbreviations
/terminology on the schematics of the chips
so I can trace the individual lines.

I would like also to compare ROM01 and ROM3.

Did Apple do this on purpose as it used more
inhouse custom chips as not to have information
readily available?

As the schematics are available, surely there
must be other documentation to go with it.

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Apple II

Apple ][+ clone PAL to NTSC modification?

Submitted by ben23239 on December 6, 2016 - 7:25pm

Hi all,
I recently came into possession of a Unitron U2000 Apple II+ clone, partially modified for PAL video output. Of the various screens I've tried only my Samsung TV can successfully lock onto its monochrome signal, and then only after careful tweaking of the video pots on the motherboard.

IMAGE(https://s17.postimg.org/snj6g0om7/Samsung_Unitron_video.jpg)

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Apple II

My Apple //e Platinum Build Out (rebuild)

Submitted by c0op3r on December 6, 2016 - 10:35am

I recently bought an Apple //e Platinum from a local seller I found on eBay. I got the Computer itself w/ 64k/80col card and floppy controller, one floppy drive and the Apple composite monitor. Condition over all was good. I took it home and clean it up some and did some research on upgrades and improvements.

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Apple II

Things to consider when looking for an Apple II (not plus)

Submitted by snazzify on December 5, 2016 - 10:13pm

Im thinking of getting an Apple II and would love to hear what you have to say when looking for one. Things to consider before buying. Doesn't need to be an early model just as along as its an Apple II.

Also the price, how much are you willing to pay.

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Apple II

Apple IIC Power Issue

Submitted by akochera on December 4, 2016 - 10:49pm

I have an old Apple IIc I am restoring. When I turn off the power, the memory does not clear for more than a minute. That is, I can turn it back on, and be back where I left it. I even tried unplugging the brick from the back of the IIc, but to no effect. So whatever is happening must be internal. Is this a known issue? I guess that it might be a poor capacitor, but is there some other component meant to drain the caps that should be checked?

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