Apple II

Powering up an old computer

Submitted by BIT on February 28, 2022 - 11:30am

I apologize for the question, but I have many doubts regarding some answers found on the web.In the past I powered an old Apple IIe, which had been at a stand still for several years, obtaining the "cooking" of the infamous RIFA 0.47 uF power supply capacitor; the problem was solved by replacing the capacitor.Now I have to revitalize another computer, my question is this:Does it make sense to use a variac to progressively power the computer?Would I have saved the original capacitor with this procedure?If so, what is the feeding progression to use?With w

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Apple II

IIc video port to composite adapter?

Submitted by desertrout on February 27, 2022 - 5:22pm

Has anyone made this adapter?

https://www.ebay.com/itm/193393714278

 

Apparently it merely pulls the NTSC composite signal from the video port (as well as the audio signal from the same port)... is that it??

https://devonhubner.org/AppleIIc_Video_Port_Breakout/

 

Word is that the output quality is noticeably improved over the regular composite... why would that be?

 

So many questions...

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Apple II

Apple II video to HDMI using Raspberry Pi Zero / Pico

Submitted by lukazi on February 26, 2022 - 8:34am

Hi All,I'm finally making some progress on a simple Apple II to HDMI adapter using Raspberry Pis.https://lukazi.blogspot.com/2022/02/apple-ii-video-to-hdmi-using-raspberry.htmlCheers,Alex.

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Apple II

4:3 LCD security monitor

Submitted by johndegroot on February 25, 2022 - 9:37am

Just saw this on amazon. It has Rca video in. Would this work on a IIe?

 

Thanks

 

https://www.amazon.ca/Professional-Security-Monitor-Chrome-Silver/dp/B07W6Z14C8/ref=sr_1_6?crid=1L3UQS10WDF3Q&keywords=4+3+lcd+monitor&qid=1645798878&sprefix=4%3A3+l%2Caps%2C317&sr=8-6

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Apple II

Mega II Chip on the IIGS

Submitted by clamm on February 22, 2022 - 8:02pm

Hiya folks,

 

So, as I understand it, the IIGS has a single chip which is essentially emulating all of the functions of the original Apple II. So, since the computer would boot by default to the BASIC prompt, does that mean that the computer was designed to boot directly into the Mega II chip in "emulation mode" and not use any of the higher 16-bit level stuff unless necessary/prompted?

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Apple II

Apple II plus keyboard encoder test

Submitted by Teckerman on February 22, 2022 - 2:38pm

Hi All,

I'm a newbie here.

I just picked up a Darth Vader Apple II plus. Got it to boot with chime but only the reset and CTL keys work. I know tose keys don't go through the encoder. I'm trying to figure out if the problem is on the encoder board or down stream (main logic board).

 

I have +5v and ground going to the encoder board.

All caps have been tested, encoder chip reseated, ribbon cable between main board and encoder checked. All good.

Put a scope on the encoder board and checked the 555 timer (no pulses) and the encoder IC (no pulses either).

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Apple II

342-0132 Keyboard ROM

Submitted by Paul19804 on February 22, 2022 - 10:35am

Have an 1983 Apple IIe (REV B) which has had the enhancement kit installed (CD, EF, VIDEO, 65C02).  It also has a new ROM in the Keyboard ROM position, simply marked "KEY."  How can I tell if it is a 342-0132 A, B. C, .... whatever?  And, really, what is the difference between the REVs?

 

Thanks!

Paul

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Apple II

Apple II monitor starting to blink/flicker?

Submitted by Thlorian on February 19, 2022 - 11:58pm

Hello all - I have an Apple IIe computer connected to an Apple II monitor.  I rarely use it but when I turend it on recently I noticed that the monitor started to blink or flicker every couple minutes.  I checked and adjusted the manual monitor settings but that did nothing to change this.  Is this something I can fix without having to open up the monitor for electronics work or soldering/desoldering?  Thanks for any info on this!

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Apple II

Apple IIe PowerOn

Submitted by GianDO on February 19, 2022 - 6:00pm

I had to take apart the original power supply of my Apple IIe to get it repaired, in the meantime I had to power my Apple IIe by taking the right supply voltages from an atx power supply which apparently works well. I plugged in and turned on my Apple IIe.The computer appears to be coming on, but a white screen appears on the screen which then disappears and is alternate with a black screen with white horizontal stripes, as if doing a test. What is the problem?

Thanks

G.

 

 

 

 

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Apple II

INFOCOM

Submitted by Khaibitgfx on February 18, 2022 - 4:55pm

I'm currently looking for quality scans of Infocom game labels, all of which will be recreated for printing out new labels for whoever wants them.

 

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Apple II

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