Denial

I've paid 2,5€ + shipping for a single key, will not pay much more. And I usually buy more than one to combine shipping. I've setup alerts in my phone for new ebay sales of commodore keyboards and saw those time ago... I wish I could blacklist some ebay users.

Then most of the modern hardware for old computers are excessively expensive. Ah.. wait... I already new that. [WINKING FACE]

Fantastic stuff Groovydrifter, always a good feeling resurrecting an old Computer. Try here for a MOS 6502 http://www.aliexpress.com/w/wholesale-mos-6502.html?site=glo&SearchText=mos+6502&SortType=price_asc&groupsort=1&initiative_id=SB_20141011005045&shipCountry=au&filterCat...

And how possibly could I have forgotten it, the first character on all this thread:



The replacement quartz crystal... still wondering why someone removed it, being a new one very cheap and available by dozens...

Self explanatory... http://tapatalk.imageshack.com/v2/14/10/10/3c4070f25b91d327018bb6f25f9bf863.jpg Pcb "ratsnest" version hard...[emoji3] http://tapatalk.imageshack.com/v2/14/10/10/429d5638a2effcc19a3a23c7fd6b1f83.jpg And GORF, of course at the size it was conceived... http://tapatalk.ima...

And this weird a NTSC machine finally boots with a PAL Kernal... http://tapatalk.imageshack.com/v2/14/10/10/c01caa56a72ecd1173d76ccc5c2a5942.jpg A bit closer... http://tapatalk.imageshack.com/v2/14/10/10/64e109b6941aad1aaa26746f9f885aae.jpg So now lest burn an EPROM with the correct Kernal an see......

Well, the headcount now also has a Kernal ROM... lets solder a socket and see if with the PAL good one it shows the boot at last...

Your explanation fits more with the text on the article, i called it microcode as that how they explained me the workings of a microprocessor so I named it that way, but the imge in my mind was like what you just said...almost... hehehe Timings are different as a way to compensate for the diffetence...

Now I should remove 4 IC's to continue... 3 ROM in the damaged board an 1 more in the test one. I already verified that NTSC kernals boot a PAL board with displaced image and not working IEC port.

Well... then I can use those "uncomplete" processors to diagnose the problem with the hardware as long I dont load possibly compromised software...

Did Commodore used them (illegal opcodes) in their ROM ICs?

Interesting... I knew that CMOS versions did not have them. I once read an article about the illegal opcodes and the writer explained that those opcodes corresponded not to undocumented tokens but to uninplemented ones, and that they triggerd the execution of the following token in the microcode tab...

So basically replacing 6502 in computers you shoud stick to the exact flavour they originally had because at some point somebody decided to use a non existent instruction instead of the correct one with no other objective than... look nerdier if somebody decides to disassemble the code? Hope the USS...

Board was 10€ + shipping.... costs for parts just now doubles the price so at 20€ still is worth. Now all depends on what more is bad... Please participate... very good ideas come from brainstormings, and to give an idea you don't need to know if it's going to work. It may trigger an idea to find th...

What are you trying now to write the image?