Re: Commodore 8296GD

From: didier derny <>
Date: Sat, 27 May 2017 07:30:10 +0200
Message-ID: <>
the 8296 is roughly a 8032 + 64k ext packaged in a serie B box

it's new motherboard integrating all the functions

the 8296D has a 8250LP included

there is nothing common with serie B and 8296 except the similar boxes

On 27/05/2017 06:40, william degnan wrote:
> Great to find an inspiring piece of hardware.
> I could be wrong but aren't programs for the B series machines like 
> the European 600/USA B128 incompatible with the 8296?  I thought that 
> the 8296 was more like the PET 8000 series with extra RAM.
> But I know little about the 8296, having only seen a dead one that did 
> not power up.  They look exactly like the high profile B series 
> machines such as a the USA CBM 256-80  / European 720
> I may have an 8296 diagnostic somewhere.  Does the 8296 have an 8088 
> co-processor?  Now that would be something rare.
> Bill
> On Fri, May 26, 2017 at 10:59 PM, MiaM < 
> <>> wrote:
>     >> One more thing - the register is not cleared by a reset. So if
>     you map
>     >> out the BASIC ROM, then press the reset switch, the computer
>     will not
>     >> restart because the BASIC ROM is still mapped out. Only
>     switching it
>     >> off and on will work. Quite sloppy design, because resetting the
>     >> computer while performing some graphics operation may render it
>     >> unusable unless physically turned off (losing all RAM contents).
>     >
>     >The register 74LS174 has a /CLR input at pin 1. I see a track
>     near this
>     pin. On the other end of this track is >pin 2 (/RES) of 6545. So the
>     question is, isn't that connected?
>     The 8296 has two different reset lines, one for the CRTC and
>     another for
>     everything else. Both goes low for a while when you turn the power
>     on, but
>     the reset button is only connected to the line that doesen't reset
>     the CRTC.
>     That's the reason why you can see the screen contents for a short
>     while
>     after you have pressed the reset button.
>     P.S. isn there any progress on the reverse engineering of this
>     card? I'd
>     really like to build one myself.
>     P.P.S.
>     In case you wounder how I ended up on this list: I just aquired a
>     PET 600,
>     which is basically a rebranded 8296. It has swedish (same as
>     finnish?) ROM's
>     for keyboard layout and character generator, but the keyboard were
>     missing.
>     I also got an empty CBM II keyboard case. Currently I have rewired the
>     matrix on an old "FACIT" terminal keyboard, made by Cherry (black
>     MX, yay).
>     It's interesting that the keyboard decode routines in ROM actually
>     support a
>     few more keys than the actual keyboard has. As my old terminal
>     keyboard had
>     plenty of extra keys I've wired up those extra keys too. For
>     example I'm
>     able to switch between the two character sets in both directions
>     e.t.c. .
>     Maybe I should make a new PCB that fits in the CBM II keyboard
>     case and use
>     the switches from this terminal. However I'm not sure enough keys
>     will fit,
>     and it feels lika a really bad idea to cut out a bigger hole for
>     the keys in
>     the case. The CBM II machines are probably rather rare as I
>     understand it.
>     I currently only have a datasette as storage, but some kind of
>     plan involves
>     building some kind of IEEE 488 disk drive emulator, or maybe a general
>     emulator of all kinds of C= IEEE hardware. (AFAIK there were
>     disks, printers
>     and a rare accoustic modem. With an emulation of a "modem" the PET
>     could be
>     used as a terminal for for example a Linux computer.
>     I'm also known for making lots of plans and seldom actually go
>     through and
>     finish my projects.
>     P.P.P.S.
>     I got hold of some old electronic junk that contains a bunch of edge
>     connectors that physically fits the PET but the connectors are "single
>     sided" in the sense that it short circuits the upper and lower
>     pins in each
>     position, thus only usable for the datasette ports. The connectors
>     are wider
>     than the datasette port, and I haven't got any of those "key"
>     things, so you
>     have to cut the connectors and also make some kind of key to be
>     sure it's
>     not inserted incorrectly. Is there any interest for such
>     connectors? The
>     could probably be used with C2N232 with some effort, but otherwise
>     they are
>     probably rather useless.
>     --
>     View this message in context:
>     <>
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Received on 2017-05-27 06:00:02

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