iNeogeo2nd 发表于 2013-3-20 05:52 2 _/ {; g7 A: M$ j) A) b
回复 xunxun 的帖子
( a' S5 X3 k9 U
/ y# Q# e# v* {) j6 x嗯,继续提问。想知道在其中的一个PCB上为什么还有一个小的PCB在那里,这卡看的好高科 ...
q! J; ^0 W5 {3 y0 L
5 M( d9 h B7 X+ T c
2 m2 \9 C) Z0 L* K8 w j' P
0 x$ a9 f# X% f; S1 p0 A- @6 Q5 p# F' o0 V( v2 O% x' j0 e, r( O
. b m+ V# u- w( c( L r# n1 X5 a6 G9 F
7 N/ p8 v8 b8 D1 c5 v3 D
搜到老外的帖子,好像有加密和编程之类用的。: k; H; H4 B" |; Z9 }3 \# V# f9 b: ]
% z3 c! `6 Q, m5 Vhttp://www.neo-geo.com/forums/sh ... tal-Slug-3-Hardware' D5 K* I0 [! \" S
: t2 s6 l1 m7 O" [ k
it´s a mvs subboard based on ngp knowhow. It enables SNK to program/reprogram the P roms with snk´s ngp cart programmer., ^: W9 f) a3 T0 P
, y5 ]: j. A' l$ AIn case there is a big glitch that passed on beta testing, this enables SNK to service the 1st batch run of carts with ease.
6 \ G8 ^, [8 @3 [7 C" ~4 j& w4 I: L y0 w1 ^( h4 Y
I think SNK also rolled carts into production while debugging the game and then added the P roms by hand on the 1st MVS run.
, w( K2 j: ]( i+ g9 m" S
9 I: Z/ I8 S& L. `! V& S3 r/ K8 J4 d7 n9 i4 f3 n' g
------------------------------------------------------ q, F/ a e; G1 R, u
& `- r6 E) l1 W+ ^: IFrom what I can tell in the pictures, the daughter board has 64mbit of flash memory (4 16mbit chips). The NGPC programming hardware would only have been able to address half (2 of these 4) chips. To program this board, a developer would plug it in to the programmer, program 2 of the chips, turn the board over and replug it, and program the other 2 chips. Notice that there is an edge connector on both sides (where a normal NGPC PCB would only have fingers on one side).
& U% f* |0 u: V1 A6 `7 c
" a7 r# c7 e4 ~; ^) l; NSo, yeah, I can only imagine that they used this as a simple way to modify the "ROM" contents (for debugging/upgrading/etc.). I would think there'd be other easy ways to write the flash chips, but maybe they wanted to piggyback on this system for some reason.& X" N% n }5 h
1 x4 |+ L' A D# M* E2 `6 ]
It's also worth noting that, at least in the NGPC case, the system itself could write to the flash chips. Is there any possibility that the MS3 cart would store data on the flash chips? 6 I/ M! S; G+ X
7 t: f3 E! ~+ D" L* U; c
4 J; Z4 G: ?0 H, WMVS合金3各种版本的PCB) q6 M/ L% ~# r& i" A: c
http://mvs.gotwalls.com/index.php/Metal_Slug_3 |