Whatever became of Turbo-816?

[BillC]

Hello AtariGeezer,

 

So this ebay number , this hardware connect to PBI port on 600XL and 800XL only ?

The ribbon cable is 40 conductor, I think that it plugs into the CPU socket

 

Found information on Atarimax which confirms this:

http://www.atarimax.com/freenet/freenet_material/5.8-BitComputersSupportArea/10.ProductReviews/showarticle.php?74

[Roydea6]

The Turbo816 is a 65816 microprocessor that runs at the normal clock speed
of the computer. It's meant to be installed in a XL/XE machine, and comes
with a replacement OS. The card measures about 3.5x7", roughly the size
of two 3.5" disks end to end. On end is a 40 pin ribbon cable which plugs
into the 6502 socket on the motherboard. On the end is a 50 pin connector
for attaching Turbo-BUS cards, like SRAM memory, PROM application cards,
hardware interface cards, blah blah.

[Tickled_Pink]

And $54 already.

 

With Lotharek working on an 65816 upgrade, which I can see being cheaper than this item, I can only imagine that people are interested in it for its legendary status and rarity.

[Kyle22]

David_P,

 

If I remember correctly, the chip on the underside of the Sweet-16 is a GAL type chip, possibly a 22v10.

Because of an 'oops' in board layout (that we discovered after the boards were made), that GAL is mounted UPSIDE DOWN with the PINS BENT OVER.

Please observe CAUTION if you try to remove and read the GAL, you will most likely blow it if you put it in your device programmer as is. The security fuse is probably blown, but maybe not all of them got done.

 

It was fairly simple logic in there, basically, the 'extra' logic on an old 400/800 CPU board, plus a little tweaking the timing through multiple gates to get it 'just right'.

 

 

 

-K

 

[+Larry]

Here's a question for you hardware types -- in the approximate center of the board, there are two additional spots for (looks like) 20-pin narrow IC's. These have diagonal jumpers across the pins. Any idea/speculation what this might be for? Got a feeling this baby will go for big $$$.

 

-Larry

[BillC]

Here's a question for you hardware types -- in the approximate center of the board, there are two additional spots for (looks like) 20-pin narrow IC's. These have diagonal jumpers across the pins. Any idea/speculation what this might be for? Got a feeling this baby will go for big $$$.

 

-Larry

Probably just buffers that were found not to be needed, perhaps the propagation delay even caused problems.

[Kyle22]

Probably just buffers that were found not to be needed, perhaps the propagation delay even caused problems.

I agree, from the pattern of jumpers, it looks like 74LS244 or 245.

 

-K