Apple II

IIc+ GLU chip

Submitted by baldrick on March 2, 2025 - 5:42pm

This is a long shot...

 

I'm looking for the General Logic Unit (GLU) chip for the Apple IIc Plus.  

 

It is labelled as part number 342-0243-A and is a PAL20X4 gate array chip, and is indicated on the IIc+ motherboard as UE9.

 

As shown here:  http://www.applelogic.org/files/3420243A.png

 

If anyone can help either supplying a replacement or has the code to program the PAL20X4 with a programmer (assuming you can still get one of those blanks) I'd certainly be grateful.

 

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Apple color RGB monitor (A2M6014) problem after re-cap

Submitted by DanNZ on February 27, 2025 - 11:00pm

Greetings all from New Zealand. I think this post will probably have a few of you shaking your heads but I still thought it was worth asking for advice...

I imported a matching monitor for my IIgs via EBay from the US, obviously using it with a step-down transformer as we're on 220V over here. It was sold "parts only". I was pleasantly surprised when it arrived to find it actually worked, it just needed the focus adjusted. I duly took the monitor apart and adjusted the focus  giving me a pretty much perfect picture. 

 

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Apple II

New Xdrive firmware

Submitted by jeffmazur on February 27, 2025 - 6:06pm

Xdrive firmware has been updated to V1.03 which addresses a couple of issues:

1. Images created on Windows machines would sometimes show incorrect long filename.

2. Using the N command to boot disk in lower slot did not work with CFFA.

 

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Apple II

help with the code!

Submitted by Jiroplas on February 24, 2025 - 12:24pm

Please, I need to decrypt this file into code! at least someone help me translate this code into basicand or assembler!!! I can't even run it because I can't! The last hope is for you!

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Apple II

Apple II Peripheral - Know-Drive (ABVDOS, Know-Play,etc)

Submitted by schafferm on February 23, 2025 - 11:57pm

Happy Sunday!

 

Looking for help finding documentation for the Know Drive from Abacus Enterprises in Detroit MI.    I've come across a Know-Drive and the attachment seen in the images.   I can not find any documentation or software for this - but would so much love to play with it!

 

I've found references to it, articles about it but not documentation - there has to be someone out there who has the software and/or documentation for this - any help would be greatly appreciated.

 

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Apple II

Apple IIc text is red and hard to read

Submitted by cinix on February 23, 2025 - 2:40pm

I have an Apple IIc connected to an AppleColor Composite Monitor (A2M6020). Does anyone have any thoughts on why the text describing each color is red and hard to read?

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Apple II

Apple II Peripheral - Know-Drive (ABVDOS, Know-Play,etc)

Submitted by schafferm on February 23, 2025 - 11:08am

Happy Sunday!

 

Looking for help finding documentation for the Know Drive from Abacus Enterprises in Detroit MI.    I've come across a Know-Drive and the attachment seen in the images.   I can not find any documentation or software for this - but would so much love to play with it!

 

I've found references to it, articles about it but not documentation - there has to be someone out there who has the software and/or documentation for this - any help would be greatly appreciated.

 

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Apple II

Audio/game sound effects -how were they made?

Submitted by Fuji on February 21, 2025 - 6:20pm

Ever since I got my first computer (yup, you know the one wink ) I've been fascinated and intrigued by all those cool game sound effects, despite not having a dedicated sound chip, but according to an article I recently came across ("Making the Apple II sing") it's essentially just a 1-bit square wave sound generator!

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Apple II

Green Monochrome A2M2010P monitor spot powerdown

Submitted by atomicham on February 21, 2025 - 2:32am

My A2M2010P is showing a bright green spot on powerdown for a couple of seconds, so it seems that the brightness circuit is still powered after power off instead of quickly closing and blocking the electrons streaming from the still hot gun.

 

I am thinking to recap it (I checked things and they seem intact, but I need to test the ESR of the caps). Any thoughts if that may fix the issue, or is there a known issue with the spot-killer circuit in this model? I don't want to burn the phosphor in the center of the screen every time it powers down.

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Apple II

ADTPro 2.1.0 client crashing to text page 2 only with specific target modern PC

Submitted by maxtherabbit on February 20, 2025 - 12:24pm

I'm running ADTPro 2.1.0 from a 5.25" diskette on a IIGS. The disk has been sector verified, the drives have been thoroughly tested. 

 

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