Hi, I have a macintosh 512k that has some modifications (an 1mb+scsi+rom upgrade board) that works fine
at least the logic board does, as the analog board is currently broken, it makes noises and squeaks and the image on the crt is way off centered, distorted and out of focus
also, the keyboard is not working right, most keys doesn't work
the possibility of getting these parts replaced is null, i'm from Argentina and there are a lot of issues for importing stuff
so i'm wondering in which ways one can replace or bypass the crt and analog board and use it with an external, standard vga monitor
i've got the logic board up and running by the modification of a standard atx psu, but the image thing is a lot trickier
i've found out that the signals used are very similar to a true EGA signal with some signals inverted and so on
managed to buy a gbs8800 board (without modifications) that should take that signal and feed it into a standard vga crt/lcd monitor, but it doesn't sync correctly
also i've tried to make a vga adapter thing with some resistors and a logic gate. this fared better as the signal does show up in one of my lcd but off centered and it loses sync sometimes
in one crt that I have lying around it shows full screen but the image is all messed up, like it needs to correct the horizontal sync, which is not capable of as it's a pure vga monitor (with knobs in front and no multisync)
sorry by all that text but, what are my options? thanks.
at least the logic board does, as the analog board is currently broken, it makes noises and squeaks and the image on the crt is way off centered, distorted and out of focus
also, the keyboard is not working right, most keys doesn't work
the possibility of getting these parts replaced is null, i'm from Argentina and there are a lot of issues for importing stuff
so i'm wondering in which ways one can replace or bypass the crt and analog board and use it with an external, standard vga monitor
i've got the logic board up and running by the modification of a standard atx psu, but the image thing is a lot trickier
i've found out that the signals used are very similar to a true EGA signal with some signals inverted and so on
managed to buy a gbs8800 board (without modifications) that should take that signal and feed it into a standard vga crt/lcd monitor, but it doesn't sync correctly
also i've tried to make a vga adapter thing with some resistors and a logic gate. this fared better as the signal does show up in one of my lcd but off centered and it loses sync sometimes
in one crt that I have lying around it shows full screen but the image is all messed up, like it needs to correct the horizontal sync, which is not capable of as it's a pure vga monitor (with knobs in front and no multisync)
sorry by all that text but, what are my options? thanks.