Apple II

Help with replacing a capacitor on a //e

Submitted by tony359 on July 5, 2020 - 2:51pm

Hi all,

 

I need to replace C68 on my board - my bad, when prying out the keyboard ROM I didn't realise that the tool was resting on it and I slightly cracked it.

 

C68, according to the schematics, is a 0.1uF capacitor on the +5V. What type of capacitor will be the best one to replace it? Can those glass capacitors still be sourced - to keep the original look - or can I replace it with a plastic capacitor?

 

Thanks!

 

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Apple II

Very Interesting Apple //e Diagnostics Card ROMS

Submitted by jwg1962 on July 5, 2020 - 2:30pm

Well, I have sucessfully dumped all the ROMs for the cards below and made a copy of the 077-0130 and 077-0131 ROMs for the diagnostics card I replicated.  

 

And lo and behold, the ROMs (that I didn't fine official Apple Part Numbers for - and now I know why) are logic board testing the Apple ][ and Apple ][+ units.  I didn't dig out an Apple II+ or one of my Apple IIs to see if this card actually works in them, but it looks like it might.    

 

I wanted to post this, but now I am going to go try it and I will post back on this thread what I find out.  

 

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Finished a couple projects this July 4th weekend...

Submitted by macnoyd on July 5, 2020 - 11:53am

Had a little extra time to finish a couple projects this July 4th weekend, one of them being a Phasor kit sold by Reactive Micro.  Henry does a great job putting this together with all parts well organized and clearly labeled for easy assembly.  I really enjoyed putting this together.

While in the process, I made a few changes (well, improvements in my way of thinking) that I thought I would share with the group.

Changes:

All IC sockets changed to vintage Augat gold machine-pin sockets.

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Apple II

Replacement cover for Apple IIe keyboard light

Submitted by joel_graff on July 5, 2020 - 8:46am

I have several Apple IIe machines I'm refurbishing and many of them are missing the keyboard light cover.  I managed to find one replacement, but I need several more and I'm starting to consider manufacturing my own.  It appears the lens cover is acrylic... mabe 10 thousandths of an inch thick... the surface is painted in Apple beige and masked on the underside.I have ideas, but I wondered if anyone else had managed to make good looking replacements...

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Apple II

How to make Apple II+ video address linear?

Submitted by tylak on July 4, 2020 - 5:14am

Hi,

I read some book that it only takes a TTL IC  to make the video addresses linear. No further details.

Anyone know how? Will it affect the refresh time? 

Just curtous about it.

 

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Apple II

Beltron

Submitted by Timelord on July 3, 2020 - 11:25pm

I recently acquired a Beltron system, and I noticed that it has markings on the keys for BASIC shortcuts. I habe yet to power it up, or to do an diagnostics on it. I am unsure at this time if it is PAL or NTSC. 

 

Do any of you have a Beltron manual, or any docs for it? 

Do any of you have ROM dumps--I plan to make some at some point.

 

Do you lnow the purpose of the 'option' ROM connection?

 

I am likely going to (one day) give it an overall charcoal cololur scheme. 

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Apple II

Exploring Apple GS/OS and ProDOS 8 by Gary Little

Submitted by PraetorX on July 2, 2020 - 10:53pm

I'm looking for a book I used to own called Exploring Apple GS/OS and ProDOS 8 by Gary Little, but can't seem to find a PDF.  Can anyone point me in the right direction? 

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Apple II

"Mike's Magic Matrix" bitmap shape editor?

Submitted by PraetorX on July 2, 2020 - 3:31pm

In a couple issues of Apple Assembly Lines from 1982, I found references to a "Mike's Magic Matrix" tool that was under development by Mike Laumer, frequent contributor to the newsletter and author of the FLASH! Integer BASIC compiler.  It sounded like Mike's Magic Matrix was a bitmap shape/sprite editor tool.  Development soundedto be pretty far along, as the author indicated they he had only a little more adjusting to do and a manual to write, but aside from these references in Apple Assembly Lines, I haven't been able to find anything more on it.  Anyone have any information?

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Apple II

Apple Disk II dual disk controller schematics

Submitted by joel_graff on July 2, 2020 - 1:51pm

Are there schematics availabe for the dual-disk 5.25" contrlller card?  PArt number 650-X104...  Thus far, I've only found the single disk controller, I think.

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Apple II

Feast of Apple IIe mainboard

Submitted by yjfy on July 1, 2020 - 11:49am

Feast of Apple IIe mainboardyjfy

 

Fortunately, I got a piece of Super II, collected some related materials, and dedicated to friends who are interested in Apple IIE.

 

In 1980,Apple IIE's first design project called "Diana". Diana was intended primarily to be an Apple II that had fewer internal components, and would be less expensive to build. The project was later known as "LCA", which stood for "Low Cost Apple". the final code name for the updated Apple II was "Super II", and lasted until its release.

 

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