Apple II

Apple 2+ No power problem just warm chips

Submitted by AmusedButler on March 27, 2021 - 9:37pm

I have been working on an old Apple 2 plus, got a new power supply and it’s all hooked up. I was trying to test the monitor with computer but no luck and the motherboard was warm, most of the ram seemed warm as well as some rom chips I can get thermal pictures/temperature if needed. Has anyone else had this issue? Is there any way I can fix it? I will try a different monitor but expect the same results.

 

 

 

Thanks in advance.

 

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Apple II

Apple II+ power issue (not supply) --> Hot chips

Submitted by Stargeezer on March 27, 2021 - 3:37pm

Hi All:

I am still troubleshooting an Apple II+ that appears to work fine w/o periphreal cards but gets wonky video when cards are in and no life in the cards.

I started doing some simple non-invasive assessments.  I discovered I have 2 chips that are getting significantly hot compared to all other chips, one is Apple ROM E0, the other is an SN74S195N.

Two questions:

1) Is this normal for these chips?

2) I have heard about DIY ROM replacements by burning your own on an EPROM.  Anyone done this and had success?

Thanks

mark

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Apple II

Apple IIe Color Monitor issues

Submitted by joel_graff on March 20, 2021 - 7:14pm

Some time ago, I acquired six Apple color monitors of the AppleColor Composite Monitor IIe and Color Monitor IIe varieties.

 

Of them, two work well, two have completely desaturated images, and two have failed motherboards (one trips the circuit breaker when it's turned on, the other just shuts off shortly after turning it on).

In any case, I'm hunting for resources to take a shot at repairing these.  Are there any available schematics?  I'm not having any luck finding anything...

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Apple II

Apple IIe spacebar

Submitted by Wizard1969 on March 19, 2021 - 7:51pm

Could someone walk me through the steps of putting a spacebar on a IIe? I am confused as to the metal bar, do you thread it through the holes in the black tabs in the space bar first, then try to put the spacebar in (seems too easy to drop the metal bar into the case, difficult to snap it in place), or do you snap the metal bar into the keyboard then try to thread it through the holes in the black tabs (can't see anything)? 

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Apple II

Applesoft ROM Card vs. Apple Language Card

Submitted by Paul19804 on March 19, 2021 - 4:09pm

I am resurrecting my Apple II (A2S1-9214) from late 1978.  I used it extensively and cut my code writing teeth on it in the early 1980s, but it has been dormant since then. 

It Boots into Monitor; Ctrl-G gives me Integer Basic (I replaced the F0 ROM); C600G starts the 3.3 System disk.  I can load and run Integer programs from there.The problem is the Applesoft (FP) ROM card has gone dead.  I pulled all the chips; deox'd them; seated everything; and all I get upon boot is a totally blank white screen and a hung system.

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Apple II

Apple 2 Plus Power Supply Clicking [HELP]

Submitted by AmusedButler on March 18, 2021 - 3:11pm

I have been reading for some time now about why this happens. I have found no resistors that could be suspect. I have replaced the capacitor with the one they have suggested. When I power it on without any load it makes a chirping noise. IS there a way to fix this? I can send Pictures if needed. I found the old apple and wanted to fix it but the powersupply went boom and smoked when I tried to power it up. I replaced the RIFA cap that exploded. I ahve a AA11040B model powersupply. I attempted to measure the power supply voltages but they were way off!

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Apple II

2513 char gen / 2716 eprom adapter issues

Submitted by blindowl on March 17, 2021 - 1:20pm

Hi, I have a II+ rev. 4 with a Swedish 2513 character generator that I want to replace with an English character ROM. I've built a little adapter board so I can use 2716 EPROMs (or actually 28C16 EEPROMs), using this PCB as a template: https://oshpark.com/profiles/Benchoff

 

Everything works fine except the first column of pixels is always black: 

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Apple II

IIgs mono text mode?

Submitted by TimCross on March 15, 2021 - 11:21pm

I have a Rom 01 IIgs which has been working fine.  But all of a sudden, the initial text mode is only showing up in monochrome over composite.  I have it set to blue but I only see gray.  I tried going back into the control panel and switch the colors but it is only monochrome.  I also tried unplugging the battery and going back to defaults but no change.

 

Weird thing is that games are still working in color.  Conan, Arkanoid 2, even GSOS still show up in color.

 

Any idea where I should start looking?

Thanks!

Tim

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Apple II

Cabling for Franklin 80-column card?

Submitted by cryu on March 15, 2021 - 9:24pm

Hello,

 

I've managed to get my Franklin to the point where it can boot off of the FloppyEmu (which required modification of the video circuit; I'll write that up at some point).  Now it's time to get all of the peripheral cards working.

 

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Apple II

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