CHA board

List from [MAME's source].

CHA boards
=MVS=

C ROM
Up to 8x 32Mbit ROMs (27C322) can be used for a maximum of 256Mbit C ROM. 27C800/27C160 can also be used depending on jumper config. Size of largest ROM is selected using a pair of jumpers. The rest should be left unconnected.

Pinouts
A NEO-273 and a LS74 are used to address C ROM. LS74 provides the 2 most significant bits. 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

CHA512Y

 * Max 8 8MiB C ROMs
 * Max 128KiB M1 ROM
 * Max 128KiB S1 ROM
 * NEO-273
 * NEO-ZMC
 * LS139,LS174

CHAFIO

 * used with NEO-CMC 90G06C7042 or NEO-CMC 90G06C7050

CHAFIO

 * Max 8x 64Mbits (4Mb x 16) C ROMs
 * Max 1x 4Mbits (512Kb x8) M1 ROM
 * used only with NEO-CMC 90G06CF7042 and 90G06C7050