Apple Disk II dual disk controller schematics

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Apple Disk II dual disk controller schematics

Are there schematics availabe for the dual-disk 5.25" contrlller card?  PArt number 650-X104...  Thus far, I've only found the single disk controller, I think.

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It isn't that different to

It isn't that different to the stardard Disk II card, aside from the connections to the drives. I could probably make a diagram for it, but the basic internal logic of the card is identical to the standard Disk II card, right down tot he same PROMs. 

 

What did you need to diagnose?

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More like reproduce.  I've

More like reproduce.  I've been fancying building reproductions as I've got a bunch of old IIe's and disk drives, but no controller cards.That said, I'm certain I can sort it out on my own, now that you mention their similarity.  I hadn't really bothered to look.  I'm already working on the single-disk controller schematic, so it'll make a nice starting point.

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joel_graff wrote:More like
joel_graff wrote:

More like reproduce.  I've been fancying building reproductions as I've got a bunch of old IIe's and disk drives, but no controller cards.That said, I'm certain I can sort it out on my own, now that you mention their similarity.  I hadn't really bothered to look.  I'm already working on the single-disk controller schematic, so it'll make a nice starting point.

 

It is literally identical logic, other than that the drive connector is one DB-25, instead of two headers. Just so that you know, these are common as dirt, so if you want to reproduce it for fun, by all means do so, but there is no aftermarket demand for them. 

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