CHA256

C ROMs
Up to 8 * 32Mbit ROMs (27C322) can be used for a maximum of 256Mbit. 27C800/27C160 can also be used depending on jumper configuration.

The size of largest ROM is selected using a pair of jumpers. The rest should be left unconnected.

These jumpers seem to apply only to those two ROMs, if the ROMs are not present, simply leave both jumpers unconnected.

A NEO-273 and a LS74 are used to address C ROM. The LS74 provides the 2 most significant bits. The LS139 enables one of four pairs of C ROMs using 2 address inputs depending on which 2 jumpers are connected.


 * Max 256Mbit C ROM (8x 32Mbit)


 * NEO-273
 * NEO-ZMC
 * LS139,LS74