CHA board

List from [MAME's source].

MVS

Name	Chips	Max C ROM	Max S ROM	Max M ROM
CHA-32
CHA-8M
CHA-HERO
CHA256
CHA256B
CHA42G-1
CHA42G-2
CHA42G-3?
CHA42G-3B
CHA512Y
CHA64-C
CHAFIO

CHA boards

CHA-32

CHA256

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.

ROM size	Jumper A	Jumper B
8Mbit	J5	J6
16Mbit	J7	J8
32Mbit	J9	J10

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.

Jumper	LS139	LS74	NEO-273
J5	2(1A)	N/A	45(A19)
J6	3(1B)	N/A	46(A20)
J7	2(1A)	N/A	46(A20)
J8	3(1B)	9(Q2)	N/A
J9	2(1A)	9(Q2)	N/A
J10	3(1B)	5(Q1)	N/A

• 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