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pier
06-15-2020, 10:08 AM
Hello, i don't have any 27c800 but i have a spare 27c160, i was interested to know if it is possible to flash a 1mbit rom file into a 2mbit eprom.

HMG
06-15-2020, 07:47 PM
You could just expand the rom file to 16Mbit with FFs and burn the resulting file.

EDIT: With a hex editor I mean

skate323k137
06-15-2020, 08:23 PM
You could just expand the rom file to 16Mbit with FFs and burn the resulting file.

EDIT: With a hex editor I mean

I prefer to simply copy the file 2x. I use 27c160 in place of 27c800 all the time. In windows copy /b I think can be used, but I double using Linux:

#cat romfile romfile > 27c160_romfile.bin

I double the rom in case the unused highest address line is toggled low or high. The rom will work with that pin high, low, or floating if you double the rom.

pier
06-16-2020, 12:55 AM
i am using the tl8766 plus with the 27c322/160/800/400 adapter usually i cut the rom files in 512k chunks and i flash it once per time switching banks. in that case can i flash only the first 2 banks and left the other 2 banks empty or i can flash them twice in the 3rd and 4th banks?

SpamYouToDeath
06-17-2020, 03:02 AM
i am using the tl8766 plus with the 27c322/160/800/400 adapter usually i cut the rom files in 512k chunks and i flash it once per time switching banks. in that case can i flash only the first 2 banks and left the other 2 banks empty or i can flash them twice in the 3rd and 4th banks?

If you connect the high address pin to ground, you should be able to use the low-half only. But... it's more convenient if you just burn the image twice, so the high address bit doesn't matter.

pier
06-18-2020, 09:47 AM
If you connect the high address pin to ground, you should be able to use the low-half only. But... it's more convenient if you just burn the image twice, so the high address bit doesn't matter.
it is what i have done but i had to cut to 512 to flash them with the tl866 plus adapter