Apple II

Super Serial Card II Diagnostics

Submitted by dhe on July 12, 2026 - 12:43am

I have an Apple IIe with a newly acquired Super Serial Card II and DB25 cable. Is there an official Apple SSC loopback plug or diagnostic package? If not, is there a community-standard loopback plug schematic and preferred test software?

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Apple II

Apple III / Disk III not reading floppies

Submitted by teragiga on July 11, 2026 - 8:37pm

Hi there,

I'm a bit lost troubleshooting this quirky machine, and I figured that this would be the best place to discuss with tech wizards.

I got my hands onto a regular Apple III, 128k. Nothing particular with this one.

I had to change a 74S257N for it to boot, and I raised the 128K 5V card to 256k.

However I cannot boot on anything at all, either using the internal drive or an external Disk III plugged in the internal port.

I've cleaned heads, but I keep getting the dreaded "RETRY" prompt.

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Apple II

Apple II Disk II strange P5A ROM content

Submitted by YLG80 on July 3, 2026 - 8:57am

I have just burnt a set of Apple II Disk II PROM's P5A and P6A in two TBP28L22 PROM's.

Nothing special with the P6A PROM.

However here is a dump of the P5A PROM bin file as found in the Asimov repository.

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Apple II

WIP: Troubleshooting a Platinum //e with RSCOPE8K in ROM

Submitted by S.Elliott on July 2, 2026 - 5:21pm

This thread is a combination of info-dump and file-share for troubleshooting a non-responsive Apple IIe Platinum on Facebook, here.

 

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Apple II

I created my own Apple II Plus clone

Submitted by Simon27 on June 28, 2026 - 4:56pm

(First of all, I can't believe I've been a member of this forum for almost 21 years!)

 

Haven't posted in a long time but since this forum was such an early influence for me I wanted to share my project. I have a real Apple II Europlus, but it's a bit bulky and not 100% reliable. I dreamed of something neater and simpler that I had a better unstanding of.

 

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Apple II

Apple IIe International corrupt composite out

Submitted by prowler on June 28, 2026 - 7:26am

Hi All,

 

About a year back I managed to get my hands on an APple IIe International computer. It came with an Apple II HDMI card so I have been using that for video the entire time.

Recently I went and bought an ESP32 to play with but after connecting it up, the display just showed flashing @ symbols. When I connect composite directly without the ESP32, it does the same so it looks to be something with my composite display. A diagnostics did not report any issues with the machine.

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Apple II

New book: Secrets of the Apple II Gaming World

Submitted by a2gamesecrets on June 26, 2026 - 10:49pm

Fellow Apple II enthusiasts,

 

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Apple II

Questions about Applied Engineering Ram Keeper eprom revision 1.7 on ROM 03

Submitted by Sid6.7 on June 20, 2026 - 12:18pm

Hi everyone.

 

My RAM Keeper has arrived. I tested it on a ROM 01 machine and there don’t seem to be any major issues, except that I wasn’t able to get the RAM2GSII GW4201D from Garrett Workshop to work, while the official Apple 1MB expansion card worked fine.

My main goal, however, is to get it working on a ROM 03 system. For that purpose, I performed the modification on the 74F27N NOR gate as required.

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Apple II

Saturn 128K problem

Submitted by Kingpin on June 17, 2026 - 6:48am

Have a strange problem with a Saturn 128K card in an Apple ][+

I think it is an original Saturn 128K RAM card and it is fully populated with RAM chips.

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Apple II

ColorMonitor IIc, narrow raster and leaky caps

Submitted by monkmaniac on June 14, 2026 - 7:14pm

(crossposted on vcfed.org forums)

Hey all, 

 

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Apple II

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