![]() (Note: some surface mount dual inline versions of the 27C160 are 44-pin, having 2 additional pins added to the left side that are not found on the DIP version - these 2 pins have no connection). These pins are extra address pins - you could probably just ground them to make it backwards compatible with the other versions. If you can't find these chips, Jameco has a 27C160, which has the same pinout, except that it's a 42-pin chip instead of a 40-pin chip, so it has 2 additional pins on the left side (the side with the "U" indention). They are different from the 27C2048 and the 27C4096 because the 272048/274096 are strictly 16-bit, while the 27C2100 and the 27C4100 can be switched between 8-bit and 16-bit (there's a BYTE' line that selects Words if HIGH and Bytes if low - when in 8-bit mode, bits 8-14 on the data bus go to high-impedance and bit 15 allows you to choose the upper or lower byte of the address to be spit out of bits 0-7). These EPROMs should be available through some distributors. I believe the 27C200 to be equivalent to the 27C2100 (and the 27C400 equivalent to the 27C4100). ![]()
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