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 <firstname.lastname@example.org > <mailto:email@example.com>> 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: > http://cbm-hackers.2304266.n4.nabble.com/Commodore-8296GD-tp4655718p4662955.html > <http://cbm-hackers.2304266.n4.nabble.com/Commodore-8296GD-tp4655718p4662955.html> > Sent from the cbm-hackers mailing list archive at Nabble.com. > > Message was sent through the cbm-hackers mailing list > > Message was sent through the cbm-hackers mailing listReceived on 2017-05-27 06:00:02
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