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California Apple III, drive, and monitor

Covers: California
MicroCoreLabs

MicroCoreLabs

Experienced Member
Joined
Feb 12, 2016
Messages
298
Delivery Options
In Country Shipping or Local Pickup
Apple III for sale - description and pictures on Craigslist ad:

sfbay.craigslist.org

Vintage Apple III Computer - computers - by owner - electronics sale

Selling a museum condition Apple III computer and display as well as the external disk drive. It is "museum condition" because computers on display do not need to work! This machine works sometimes...
sfbay.craigslist.org

The Apple III metal chassis is very heavy so possibly cost prohibitive to ship. And attempting to ship vintage CRTs usually ends in tears. So local pickup is desirable...
 
MicroCoreLabs said:
Apple III for sale - description and pictures on Craigslist ad:

sfbay.craigslist.org

Vintage Apple III Computer - computers - by owner - electronics sale

Selling a museum condition Apple III computer and display as well as the external disk drive. It is "museum condition" because computers on display do not need to work! This machine works sometimes...
sfbay.craigslist.org

The Apple III metal chassis is very heavy so possibly cost prohibitive to ship. And attempting to ship vintage CRTs usually ends in tears. So local pickup is desirable...
Click to expand...
Is that your CL ad?
 
Nice Machine. 128kb 12v system. hopefully with all the new devixes and interest we will see new software for the apple ///. Hopefully someone will start making affordable 5q2kb ram cards too.
 
It is a beautiful machine. But the ICs they placed at the front of the PCB right under the keyboard get very hot and there is practically zero airflow. Interestingly, the hottest devices are the Apple part-numbered ASICs(PLDs), so I wonder if there is a modern replacement for them - perhaps one using a cooler CMOS-type technology so they run cooler.

They shipped less than 80K of the original Apple III units in its lifetime so probably a very small number of them are in collector's hands. Even less which are in as good condition as this one...

I feel like I am talking myself into keeping it.. :)
 
Yep you want to keep it. Figure out a way to water cool the thing or something, you should be able to build a chiller and a plate to get the heat out of that box somehow.
 
The only failures i have encounted were a keyboard encoder thst failed but thankfully Joe from Joea computer museum was just finishing up his prototype A3 KB encoder so thst saved the machine.
And it had two bad 12v ram modules and i also used thr 4116 stack method off joes website to fix that. I did upgrade a 12v system to a 5v system and had Stwph at hobbyroms.com burn me some new proms to upgrade the board.
 
I used my MCL65+ board in place of the 6502 to generate constant read cycles to the ROM and I saw that the chip select never was activated. I traced it down to one of the Apple ASICs (PLDs) which get ferociously hot…. It appears that one of the outputs can drive high but cannot drive low - I see an intermediate voltage level. So I added a pulldown with some jumper wires and was then able to boot it consistently. (Around 10 times since last night). After work today I will wrap a pulldown resistor around the DIP package pins and see if the fix is durable.
 
MicroCoreLabs said:
I used my MCL65+ board in place of the 6502 to generate constant read cycles to the ROM and I saw that the chip select never was activated. I traced it down to one of the Apple ASICs (PLDs) which get ferociously hot…. It appears that one of the outputs can drive high but cannot drive low - I see an intermediate voltage level. So I added a pulldown with some jumper wires and was then able to boot it consistently. (Around 10 times since last night). After work today I will wrap a pulldown resistor around the DIP package pins and see if the fix is durable.
Click to expand...
Good job!

By the way, I have never seen an Apple // with that ribbed base-plate. I have only seen the aluminum and stainless steel plates. Interesting. I have seen the sticker showing the 64kb and 96kb variants although Im told none ever sold with RAM below 128KB
 
Last edited:
MicroCoreLabs said:
It is a beautiful machine. But the ICs they placed at the front of the PCB right under the keyboard get very hot and there is practically zero airflow. Interestingly, the hottest devices are the Apple part-numbered ASICs(PLDs), so I wonder if there is a modern replacement for them - perhaps one using a cooler CMOS-type technology so they run cooler.

They shipped less than 80K of the original Apple III units in its lifetime so probably a very small number of them are in collector's hands. Even less which are in as good condition as this one...

I feel like I am talking myself into keeping it.. :)
Click to expand...
Joe Strosnider sells modern replacements for all the custom logic:

 
Awesome, Thanks! I isolated the fault to one of the Apple PLDs, so im glad that there are replacements available.
 
I have a second working Apple III, monitor, and external drive for sale. Please PM me if interested.
 
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