Converting a 9000 mobo to a 4032.

[j1mt3hcop13rwr3nch]

Or more specifically, just swapping keyboards.

I have a 2001 case, keyboard, and 9" CRT - board has the 4.0 upgrade. Keypad is the style with the 20 key numeric pad. Have a 9000 with a 12" CRT and the 11 key numeric pad.

Because of requirements of a specific project, I wish to use the 9000 mobo in the 2001 case with the 2001 keyboard. Of course the keyboard matrices are different - and the 2'kb can't be "rewired" to be read as the 9'kb because (at the least) the shifted characters don't correlate.

I do know that altering the jumper settings and swapping the roms will "convert" the 9000 board to a 4032 and able to see the correct matrix. Of course I don't have a set of 4032 ROMs and I assume the ones on the 2' upgrade board are vastly different. (as there are twice as many)

What to do? I feel my options are down to the following:

1- as I have an eprom programmer available (if anyone has the contents of the various ROMs?) - I could burn a 4032 set, desolder the MOS PROMS, add sockets and call it a day. Question: Do I need the entire set or only the one that deals with the keyboard - and if the latter, which one? Any chance of being lucky enough that one of the upgrade board ROMs are exactly what I need?

2- get me grubby little paws on a 4016/32 board - but none have come up for sale in the "sell" section yet.

3- major cut/paste/fibreglass/sand/paint the cases to mate the 9' keyboard to the 2' case. I'd rather not.

Anything I've forgotten?

Also. I'm fine with going "back' to 40 columns - this is actually desired for what I'm up to. The 9's jumpers have been left intact so far. I connected the 9" CRT to the 9000 board (on the proper trafo taps for the size) and it wasn't very happy - reversed display with overscan. I know the character ROMs are identical, will reverting the board back to 40xx fix this? not that it really matters - I can easily mod the 9's video board to operate the 9" tube, but I'm just curious.

Anyway, any help would be appreciated.

btw... If anyone is curious - or just needs a laugh today - here's a link to some pics of the insanity I'm up to.

http://findsomethingandburnit.com/temp.html

Thanks, Jim.

[j1mt3hcop13rwr3nch]

Ahh. I'm worried that the lack of response might be due to the fact that the questions just didn't make sense?

I've done a bit of research, but am still having little luck. Mabbe some new info would help?

The board I have is the 40/80Column dynamic PET board. A bit of searching has gained me the ROM images for roms b,c, and d 4.0, as well as 2 versions of the editor rom.

After reading it would SEEM that only the proper editor rom is what will be required to use the graphics keyboard? Is that correct?

My "new" problem is that the original 2332 ROM is not pin for pin compatible (as far as datasheets) with either the 2716 or 2732 eprom, however I'm sure that I've seen a standard 27xx EPROM in a PET socket more than once.

Do either standard EPROMs work "plug and play" (because for example the way A11 is utilized or not on the bus)? Or will a board mod be required to deal with pins 18, 20, and 21?

As far as the jumpers on the board. So far I haven't found anything on the various settings. I'll pour over the schematics for clues, and IIRC some are marked - but can anyone shed some light on the proper settings for 40 column "N" keyboard settings?

And please slap me in the head if I'm barking up the wrong tree altogether.

Thanks, jim.

[gklinger]

You might get a better response by joining and then posting to the CBM Hackers mailing list. The level of expertise on that list is staggering and questions like yours are standard fare.

Hope that helps.