daver2
10k Member
You’ll have to wait for Nivag to respond on that...
Dave
Dave
Good morning Dave, ok....my next step is Buy the two new 244 ics, right?You’ll have to wait for Nivag to respond on that...
Dave
a) No idea; my guess is that there is something that has failed since earlier testing or something intermittent.You’ll have to wait for Nivag to respond on that...
Ok but Pettester can run also without other rom ics inserted, right?It can get confusing along the way if more faults crop up and paralysis sets in.
I think the best move at this point is to:
1) Make a standard set of ROMs that are known to work using the 2532 and 2716 types.
As pointed out here in this thread, the files for these are available on zimmers:
2) Replace all of the ROMs together, the Kernal ROM, the Edit ROM and the two BASIC ROMs and also replace the Character ROM.
(Don't try any hacked ROMs or ROM variants, just standard files from the Commodore originals for the Dynamic PET).
This way you can then be 100% sure you are not sitting on any residual ROM problems.
When that is done, take a fresh approach to fault finding the computer from scratch, as if it is a machine you are initially trying to repair.
Only after the computer is working, try to substitute originals ROM's or other ROMs back in, one at a time, to verify they are ok, or not.
I'm not 100% sure but I think the Pettester requires at least a good Kernal ROM, but Daver2 would better answer this question.Ok but Pettester can run also without other rom ics inserted, right?
Thanks
Gadget would probably be a better term than product in my case. My gadget is actually a ROMulan RAMulator. ROMulator is the name of bitfixer's gadget.Nivag ... ROMulator product.
Wow! You have a 244 shop!Ok thanks so much, this evening i'll go to shop to buy new 244 ics....
Yes, near my city there is this little electronic shop that has some vintage ics....Oh! Hai un negozio 244!
Great project!!I am just designing a ROMulator for work at the moment. It will be able to support up to 128 sets of ROMs - each of 32KB (27256 EPROM replacement). This will be implemented in a Xilinx FPGA with block RAM and will be booted from an onboard SPI flash. I am just designing the ‘user interface’ - i.e. a set of rotary switches (x2) to select the desired set of emulated chips.
Yes i have socketed these 244....i have always pulses on pins 1-19.... I don't think they are faulty but i'll try the others 2The 244 device is a simple buffer, you can test it on a bit of breadboard to see if they are fully operational.