Apple II

Apple ][ video signal re-sync? External sync?

Submitted by jlafleur on October 15, 2020 - 12:55pm

I'm trying to use my Apple ][ as a text generator for my Panasonic MJ-MX12 mixer. 

The device allows for an external camera for chroma key duties, it requires that the camera signal be in sync and and external sync for the camera is provided.

 

The Apple ][ is a very cost effective beast so I realise Woz may have designed it in such a way that I cannot just get the raw luma signal without sync. (I'm hoping!)

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Apple II GS RGB Monitor Issue

Submitted by awoodbridge on October 14, 2020 - 5:42pm

I just recieved a Apple II GS for my classroom. I doubt it's been used in forever.

 

The Macintosh Color Monitor that it came with isn't working. I can hook up a Composite display just fine. Where should I start troubleshooting on this?

 

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Apple /// Plus no sound

Submitted by Verault on October 14, 2020 - 9:25am

So my Apple /// Plus which I thought was working apparently is not. It will not put out any sound at all. I have tried a known good speaker and according to the apple /// service manual :

https://mirrors.apple2.org.za/ftp.apple.asimov.net/documentation/apple3/service_reference_manual/Apple%20III%20Service%20Reference%20Manual-OCR-1982.pdf

 

Page 326 states you can try replacing LM380 (U103) . I did swap out the IC from a known working Apple /// and it still plays no sound. Where should I look next guys?

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Adjusting drive speed on Apple /// floppy drives

Submitted by Verault on October 13, 2020 - 1:22pm

So I have 5 apple /// floppy drives that are way out of wack as they have been sitting for years. A couple were broken with bad TTL chips but they are working again. I just need to adjust the speed.

 

Im very familiar on the apple II line of floppy drives on how this is done but as for Apple ///'s? Which program should I run? What is the optimum drive speed for the Apple /// Drives? Is it still 300?

I cant seem to find an actual SOS program that will tell me the drive speed and let me adjust the Drive speed pot on the drive mechanism to get it correct.

 

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ITT2020

Submitted by arkleyjoe on October 13, 2020 - 9:50am

I am hoping someone can advice me. I have two questions.

I have an ITT2020 which is a 1979 Apple II clone. I am about to attempt to get this one in to fully working order. I have two question which I am hoping you guys may be able to help with.

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Virtual Disks: Alt to CFFA3000 for DOS 3.3 and/or PASCAL disk images?

Submitted by Timelord on October 11, 2020 - 4:01pm

Is there an existing internal card that fits to an internal slot that allows selecting an image off of a USB or CF card (DOS 3.3 and ProDOS) and mount that to D1 or D2 on that slot in a ][. ][+, or //e?

 

I own a Floppy Emu, and I own a BOOTI, but what I would like, is an internal card that gives an on-screen (Apple II display) list of disk images, allows you to select one, and mount it to one of the two drives. As the CFFA3K is out of production, and no-one has seemingly picked up production of a new version, what else exists?

 

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spreading 800KB 3.5" IIgs disks over several 140KB 5.25" disks

Submitted by Verault on October 8, 2020 - 2:00pm

Is it possible to take an existing disk image 800KB from a IIgs program and spread it out over several 140KB  5.25" floppy disks? IS this something ciderpress can do? Why? Lets just say someone has a working IIgs and several 5.25" drives but no 3.5" drive and cant afford one. No emulation, strictly real floppy disks.

 

Can it be done and how?

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Apple II

Apple IIe RAM problems...but I don't think the chip is the culprit

Submitted by Dr. Webster on October 7, 2020 - 4:36pm

I'm trying to fix a memory problem in a IIe. The self-test reports one chip is bad with the message:

RAM 0 0 0 0 0 0 1 0

So I desoldered the chip in position 12 (second from the right in the row of RAM chips) and installed a socket. Continuity between the socket and where the traces lead (ground or the pins of other RAM chips) looks good.

The RAM chip I removed was an MT 4264-15. I bought some replacements off of eBay and installed one in the socket (with the notch in the correct orientation). The self-test reports the same error.

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