Apple II

My //c is back and I want to keep it that way!!!!

Submitted by DistantStar001 on April 14, 2021 - 4:43pm

To recap:  The voltage regulator on my //c died and fried the fuses in both the PSU and the motherboard.   I spent about a month or so trying to trace the faults, found several, but not all.  So I replaced the regulator!  So now my //c is back and running!!! :-D  

 

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Apple II

M&R Enterprises Sup'R'Terminal 80 column card

Submitted by AndyG001 on April 14, 2021 - 1:47pm

Hello,

I have an Apple II M&R Enterprises Sup'R'Terminal 80 col card which doesn't work. I type pr#3 and there is no output signal to the monitor (lcd).

I have checked the eprom and 6845 crtc chip which are fine. Does anyone have any schematics that I could use to trace through the circuits ?

The 2114 ram is also fine.

Thanks

Andy

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Apple II

Seeking pdf manual of GPIB 7490A CCS card

Submitted by plore90 on April 13, 2021 - 10:12am

Hi to all,

I bought CCS California Computer Ssytem 7490A GPIB card for apple II but I don't have the manual. Is there anyone who can kindly provide it to me in PDF format?

Thanks in advance

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Apple II

Disk II extender cables

Submitted by jlandahl on April 12, 2021 - 5:13pm
I use my  Apple IIe computer only intermittently, storing it away much of the time, and didn’t want to have to repeatedly remove and reinstall the disk controller card or disconnect and reconnect the cables for my two Disk II 5.25” floppy disk drives.  I thought about making some drive extender cables but then happened to run across these Disk II drive extender cables on eBay.  They’re 7” ribbon cables with the proper connectors on each end.  The instructions emphasize that care must be taken in plugging them in to avoid damage to the drives, something I’m all too well awa
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Apple II

Amdek video S-500

Submitted by Stargeezer on April 12, 2021 - 9:34am

A little tangential to Apple IIs, but related.  I have an Amdek Video S500 Amber CRT  (always wanted one as a kid in the '80s).

It "works", but the image is soooooooo faded.  Even with brightness and contrast turned up full, the image will be there for maybe 30 seconds, but very dim and then fade away.

Anyone ever fixed a CRT?  Based on some Googling,  I am suspecting the fly back transformer (is that the right name)?

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Apple II

Apple II Paddle Connector - BROKE!

Submitted by Paul19804 on April 10, 2021 - 3:31pm

It had to happen after 40 years; the pin on the paddle connector broke off.  And, it wasn't one of the "NC" pins; it was the +5 pin.

I've considered chopping the connector off and soldering the leads to a 16-pin DIP component connector.  Or, if the leads are the right gauge, crimping them in a ribbon cable connector.

Any suggestions?

Thanks,

Paul

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Apple II

What is a REPEATERRRR and a SCOOTER II?

Submitted by hbroadwell on April 10, 2021 - 12:38pm

So I just bought an Apple II Plus and it has a couple of unusual add-ins

The first one is the REPEATERRRR card that was attached to the keybord decoder and had a wire to pin 1 on the 74LS251 cip located below mthe Game I/O port. I tried to Google this card but didn't finda any thine useful. Ther is a company name in the top right corner that HOME and the letter O has a lighting bolt on it. 

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Apple II

CP/M on the microsoft softcard

Submitted by Verault on April 9, 2021 - 11:09am

I have a question about CP/M usage and boot floppies on the Apple II using a microsoft softcard. I remember on other CP/M based systems there were commands to transfer the CP/M boot sector to any disk and make it bootable. I am unfamiliar with doing this on an APPLE II running CP/M. Can someone help me with this?

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Apple II

New to my Apple iie, stumped on ADTpro

Submitted by Dan in Vermont on April 4, 2021 - 9:17pm

Hello.

 

I've been working on my Apple iie, and I'm stuck on the transferring a disk part of ADTpro. I get the ADTpro PORSOS and serial transfer, it's all good there. I'm getting the Host Timeout error when I try to hit enter at the file name prompt to show the list of disks in my directory on the windows laptop.  

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Apple II

2e motherboard with 1 Ohm over the 12V

Submitted by Lowlander on April 4, 2021 - 10:06am

Hi hi

 

Was testing a 2e yesterday. It booted but after a few seconds went down with the psu making worrying noises.

At first thought it was the PSU, so switched a working one on it, but only made same noises.

Then measured the V's of that one and compared them to the first one and all looks good.

So the 2e board itself...

Measured resistance over the power lines; - V's are good. +5 was just some 10 Ohm, but went high when i unplugged keyboard. Seems to be the light in there that makes the resistance low, bc it seems to be a an actual tiny lightbulb.

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