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Author Topic: Starblade vs Galaxian≥ : System comparison  (Read 9607 times)
DarthNuno
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« on: October 30, 2009, 07:05:25 PM »




Because I want *so badly* to help as much as I can the understanding of the Galaxian3 hardware, here's the comparison between the Starblade boards (Namco System 21) and Galaxian3 (Namco System 21 'custom'?).

Fortunately, I own all the boards from both games  Tongue

Let's start with few of them first (I don't want to have a room full of boards  Roll Eyes)...



Note : you can click on all pictures from this post for a 'big size' picture  Wink

1. DSP board :



UP      : Starblade DSP board
DOWN : Galaxian3 board

Hey, they seem to be ... the same board  Tongue

Yes, the board is exactly the same... see the reference on it :

For Starblade  arrow



For Galaxian3 arrow



Now, the differences, regarding the settings :

For Starblade no EPROM at position 1F, 1K1, 1N arrow



For Galaxian3 there are EPROMs at position 1F, 1K1, 1N arrow




Now, see the difference between the jumpers position :

         Starblade            Galaxian3

JP3       VCC                    GND
JP4       GND                    VCC

all the jumpers are set in the same position.

 arrow 100% the same board, but not populated the same (*) Cool

(*) : Well, because it's a 'spare' Starblade board, maybe the EPROMs have been removed. I'll check on the DPS board *inside* my working Starblade game.

« Last Edit: October 30, 2009, 08:00:50 PM by DarthNuno » Logged

Naibo
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« Reply #1 on: November 12, 2009, 05:01:58 AM »

yes, they are the same board. starblade should have EPROMs.

However, I noticed that the OBJ board between these 2 games are different. Could you take some pictures of them?
 Wink
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DarthNuno
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« Reply #2 on: November 12, 2009, 06:20:53 PM »

OK Naibo, let's compare the OBJ boards :

2. OBJ board :

Left : Starblade [named :  8623961803 OBJ(B)]             Right : Galaxian3 [named :  8623962002 OBJ(C)]



Examine the OBJ board from Starblade (the Galaxian3 board details are available in this post) :






COMPONENT SIDE :



[click on the pictures for the full 600 DPI size picture (approx 14MB)]

SOLDERING SIDE :



[click on the pictures for the full 600 DPI size picture (approx 12MB)]

As you can see, the OBJ board are very similar for both games.

Let me know if you need more details (jumpers position, better pictures, ...)
« Last Edit: November 12, 2009, 06:25:11 PM by DarthNuno » Logged

Naibo
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« Reply #3 on: November 13, 2009, 05:21:36 PM »

Yes, I saw some difference between the 2 obj boards.
Actually, there are also some different in software side I've noticed, the palette structure, for example.

I'm submitting my galaxian3td driver to MAME soon. I'll update the 3D Model Viewer as well, since its own palette has recently been extracted , we needn't borrow it from starblade anymore.  Cool

BTW, for those PCB pictures for galaxian3td, could you send me their original scans, before photoshop's joining? Since there are some tiny mis-matches in the joined border, although not a lot, a few important signals are affected.

Let me send you my email address by message?
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DarthNuno
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« Reply #4 on: November 14, 2009, 06:14:38 PM »

I've sent you all the files I've used for the pictures via PM  Wink

But I didn't have the CPU one left. I've done new scan today, here the component side :

CPU part 1
CPU part 2
CPU part 3

13MB per file  Wink

Let me know if you need other pictures  Kiss

Many thanks for giving us feed back on your 'historical' work, relative to this 'historical' game  Kiss Kiss Kiss
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DarthNuno
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« Reply #5 on: January 16, 2010, 11:49:12 AM »

3. PGN board :

Now let's see the difference between the PGN boards.

UP : Starblade
DOWN : Galaxian≥



Wow... these two boards are exactly the same  Shocked ...except the name, see :

Starblade  arrow





Galaxian≥  arrow





No difference at all! But why Namco named it differently?

- STARBLADE : 2252961301 SYS21 PGN(C)

- GALAXIAN≥ : 8623961600 PGN

Well, because the original hardware has been done for Galaxian≥ first, when Namco decided to use this part of hardware (PGN board in that case) for others games like Starblade, they probably decided to name that system 'SYS21'.
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uncletom
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« Reply #6 on: February 16, 2010, 04:58:51 PM »

Oh man damn! This forum is interesting! I keep running into bigger and better surprises each time I come here! I don't want to go to work, but instead sit and read every thread in this forum. I have to get back to this later...
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Etienne MacGyver
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« Reply #7 on: February 16, 2010, 07:01:06 PM »

Oh man damn! This forum is interesting! I keep running into bigger and better surprises each time I come here! I don't want to go to work, but instead sit and read every thread in this forum. I have to get back to this later...
thats what i thought when i entered, i spend the whole weekend  Cool
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uncletom
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« Reply #8 on: February 16, 2010, 11:46:45 PM »

haha..well ofcourse you did. I normally hang on our swedish forum 'arkadtorget.se' where we discuss various things from arcade games, repairs, to whatever at all between heaven and earth. But I feel that there's nobody like me in Sweden with whom I can identify regarding my game preferences. On dragonslairfans, I feel that here are lots of me, that's people like me.

You know, I was, and still am the only guy in Sweden who imported the Starblade, my Starblade was the only one in this country. I leased it out to an operater in town, together with my then newly bought STUN Runner. So my Starblade was sharing the arcade with Sega Rally, Indy 500 and some billiards. Although I think that the clients were somewhat not exactly Starblade players, still the game had gone about 5000 games in a month which is about 50.000 SEK counting 1 credit for 10kr.
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uncletom
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« Reply #9 on: February 17, 2010, 07:49:29 PM »

Ehm, I may have been wrong about the 5000 games in a month. I have a very bad memory. 50k SEK sounds alot. It could have been a 1000 games in one month. Sorry.
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