PROG board

Cartridge PCB which holds the P and V ROMs.

List from [MAME's source].

MVS

Name	Test	Max P ROM	Max V ROM
NPS-PRG1	[[UPD4990], BR4090, PCM
PROG-8MB
PROG-EP
PROG-G2	PCM,SNK-9201	512*2(+/?)1024
PROG-HERO
PROG-NAM
PROG16
PROG4096	PCM	2*512+1024+2048	3*2048
PROG4096B
PROG42G
PROG42G-1	PCM	128+1024	4*1024
PROG42G-COM
PROG8M42
PROGBK1
PROGBK2
PROGBK2R
PROGBK2S
PROGBK3R
PROGBK3S
PROGEOP
PROGGSC
PROGLBA
PROGTOP
PROGV
PROGMC2	PCM	8192	8192

NPS-PRG1

Neo Print cartridge. Has an UPD4990 and a BR4090 serial EEPROM.

PROG-EP

J1/J2: ROMWAIT (B25) on cart edge.

PROGBK1

The only non-protected board that can bankswitch and use all V ROM space. Really common and very useful for homebrew stuff or converts.

P ROM

The P1 ROM can be 4Mbit, 8Mbit or 16Mbit (27C400/27C800/27C160).

• If P1 is 16Mbit then some jumper must be set (JB3? didn't look into it. see kof95) and P2 should be empty. First half of P1 is mapped to 0x200000-0x2FFFFF and second half is mapped to 0x000000-0x0FFFFFF.
• If P1 is 4Mbit or 8Mbit, then P2 can contain a bankswitched ROM (same type as P1 plus 27C322). P1 appears at 0x000000-0x0FFFFF. P2 banked rom appears in 0x200000-0x2FFFFF.

Bankswitching is done with the LS74. It's not needed if the game isn't banked. Any write to an odd address in the 0x200000~0x2FFFFF range will set the bank. 512KiB banks ?

Cart edge	LS74	P2
A5(68k D0)	2(D1)	N/A
A6(68k D1)	12(D2)	N/A
A28(PORTWEL)	3(CLK1)	N/A
A28(PORTWEL)	11(CLK2)	N/A
N/A	5(Q1)	42(A19)
N/A	9(Q2)	32(A20)

V ROM

There is a maximum of 4 V ROMs which can be 8Mbit, 16Mbit or 32Mbit (27C800/27C160/27C322) for a maximum total size of 4 * 4MiB = 16MiB.

A 4Mbit ROM can also be used, but only if there's one and only if it's in the last used slot.

The size of the largest V ROM is selected with a pair of jumpers on 6 spots (3 possible choices).

Largest V ROM	Jumper set
8Mbit (1MiB)	JV1+JV2
16Mbit (2MiB)	JV3+JV4
32Mbit (4MiB)	JV5+JV6

This pair of V ROM jumpers effectively choose a set of 2 of the PCM chip address outputs to input to the LS139, which will enable one out of the 4 V ROMs at a time.

The JV7 to JV14 jumpers need to be set according to the ROM types. If it's less than 32Mbit, the JV7/JV8/JV9/JV10 jumper needs to be set (ground). If it's 32Mbit, the JV11/JV12/JV13/JV14 needs to be set (A20). This is because 32Mbit chips have their /BYTE pin replaced by A20.

Other

The LS08 is used to AND the /PORTOEU and /PORTOEL signals to get a /PORTOE.

• 4x 1/2/4MiB V ROMs
• 1/2MiB P1 ROM
• 1/2/4MiB P2 ROM
• 2x 512KiB EP1/EP2 ROM
• PCM chip
• LS139,LS08,LS74

PROGBK2

Looks identical to PROGBK1 in terms of ROM layout but uses a NEO-PCM2 for encryption plus all other logic that was done with discrete chips on PROGBK1.

PROGV (Brezzasoft)

Same board manufacturer as SNK ?

• 42pin V1 and P1 ROMs (DIP or TSOP)
• 64KiB Battery-backed RAM (Mapped to $200000~?)
• External I/O port (8 ?)
• Room for 2x8DIP switchs

PROGMC2(Prototype Board)

[Billy Pit's Neo-Geo Proto Page] or [[1]]