finally the probleme reappeared with the wires removed... the cursor alternating from the bloc to checker apparently randomely... I also have $7f character appearing in place of normal char but probably caused by the video refresh not the video memory corrupted but now I have sometime an interaction with the cpu... yesterday after having removed the wire the machine was stable for hours... Le 12/15/2022 à 10:15 PM, Bill Degnan a écrit : > I guess you have to map the keyboard first! good luck. > > On Thu, Dec 15, 2022 at 4:07 PM <didier_at_aida.org> wrote: > > Thanks Bill, I will check the schematics and try to see if by > typing a series of characters I get other errors > > actually it's not so easy I have a keyboard with black keys > without any marking.... > > Le 12/15/2022 à 4:44 PM, Bill Degnan a écrit : >> This reminds me of a teletype repair where the ascii characters >> have a bit stuck hi ir low. So, you'd compare the cbm ascii >> value of the character you're getting with the character you're >> expecting. See if other characters are impacted to determine the >> pattern. Use this info to track down the fault i.e. which data >> line is sticking hi or low. Also, is it a screen ram or general >> ram issue, you can test for that. >> >> On Thu, Dec 15, 2022, 10:35 AM <didier_at_aida.org> wrote: >> >> on my 8032 motherboard, I have a strange cursor >> >> blinking 2x2 checker board... >> >> when I replace the ram and rom (except $E000) with tynemouth >> ram/rom I get the same result >> >> the $E000 is brand new and made with a 28c16 containing >> Steve's NTSC editor... >> >> >> I'm convinced the problem comes from the crtc or the >> circuitry producing the video signal >> >> any idea ? >> >> >> thanks >>Received on 2022-12-17 14:00:03
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