Hi guys, on power on my Apple IIe PAL filled the video with garbage, i replaced all the RAM IC and it started. I was able to interact. I wrote something and press return and i got "?SYNTAX ERROR".After some power off and power on, i got screen but i'm not able to interact, if a press CTRL+closed apple+reset the diagnostic start and I got KERNEL OK.Any suggest to fix the problem?thanks a lot
Anonymous
User login
Please support the defense of Ukraine.
Direct or via Unclutter App
Active forum topics
Recent content
Navigation
No Ads.
No Trackers.
No Social Media.
All Content Locally Hosted.
Built on Free Software.
We have complied with zero government requests for information.
what did you type that produced the SYNTAX ERROR?
Try typing HOME and then return. Does that work?
I wrote some char and hit enter, but now i'm not able to write anything i think the encoder chip is faulty, is there a way to test it?
Now every time i power on, a "+" is printed repetitevely
thank you
The keyboard may need to be thoroughly cleaned. Also make sure the cables and socketed chips are firmly seated.
Yes, I cleaned the keyboard and checked the IC, the strange thingh is i'm able to launch the test with CTRL+close apple+reset, but if i press a key no chars are printed on video.
thanks
[quote=zappx]
Yes, I cleaned the keyboard and checked the IC, the strange thingh is i'm able to launch the test with CTRL+close apple+reset, but if i press a key no chars are printed on video.
thanks
[/quote]
Well that suggests the encoder is broken. The reset key is the only key that doesn’t go through the encoder and it sounds like that’s the one key that works.
I will buy a new encoder, i will let you know if everything will works fine.
thank you
Hi, I replaced the encoder chip and now the apple IIe stopped to repeat number 9 or + on the screen, but the keyboard does not work. Any suggest?
N.B. the keys combinations for reset and test works fine
thanks in advance
Just fyi reset and apple keys do not pass through the keyboard scan circuitry. It could be the keyboard, the 40 pin ay-5-3600pro (you may have gotten a bogus or faulty one) or the keyboard ROM.
And of course, always check the power supply first! Make sure all the voltages are within spec, especially the -12V.
Many thanks to all guys, I replaced again the AY-5-3600-PRO. The first one was a "clone" bought on ebay at low price, for the second one I made sure that it was an original GI encoder chip and it worked. I fixed the problem, now the keyboard works fine.
regards
I have exactly the same keyboard problem. With the comments I've read, I will order a new AY-5-3600-PRO. Could you please tell me where you bought it so I can hopefully skip the "not working again" step.
Many thanks!
Hi, i bought the chip from ebay.
try this link https://www.ebay.com/itm/Peripheral-Interface-Support-Input-Output-All-New-Old-Stock/382776218543?hash=item591f3d93af:m:mWs7DODY7I_ofT1hgMzqpCA
i hope this help you
Here's the link to U.S. eBay:
https://www.ebay.com/itm/Peripheral-Interface-Support-Input-Output-All-New-Old-Stock/382776218543
Thanks for the feedbacks!
I'm waiting for delivery and should be able to test it in a few days/weeks...
I installed my new AY-5-3600-PRO chip and the keyboard works like a new one!Now I have a problem with the disk drive that does not start. At power on, the drive creates a couple of "ttrrr" as usual, but it continues to spin continuously and nothing happens. It's like it's not a boot diskette.I tried with the 2 drive units that I have, different diskettes, with the same result. I also cleaned the disk drive heads with alcohol.Could it be the disk controller card that is bad? (which is obviously installed in slot 6)An idea of what could be wrong?
Thanks!
The most common failure on Disk ][ is the 74LS125 on the analog card blows. That is normally caused if the cable is plugged in the wrong direction or off by a pin. That chip sort of acts as a "fuse" and usually saves other parts from frying. The bad thing is, that quite often what it blows like that the boot sector of any floppy inserted into the drive will get wiped. So until you verify this is not the problem you probably don't want to try any more floppies.
Good news! I changed the 74LS125 as suggested and my floppy drive is working good. Thanks for your help!
Glad to hear the floppy is working.