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gstream: MAME ROM Information.


G-Stream G 2020 (c) 2002 Oriental Soft Japan.

Shooter from Oriental soft, heavy influence from "XII Stag" as well as "Trizeal". Three weapons may be carried and their power controlled by picking up capsules of a specific colour.

Three capsule types:

Red - Vulcan

Green - Missiles

Blue - Laser

Points are awarded by picking up medals which are released from shot down enemies. The medal value and appearance is increased as long as you don't miss any.

When enough medals have been picked up a 'void' bomb becomes available which when released (hold down main shot) will create a circular void. Enemy bullets which hit this void are transformed into medals. If you place your ship inside this void it becomes invulnerable.


CPU: Hyperstone E1-32XT

Sound: OKI 6295 x2 (rebaged as AD-65)

OSC: 54 MHz, 27 MHz, 16 MHz & 1 MHz

Other: Sigma Xilinx XC95255 x2

Players : 2

Control : 8-way joystick

Buttons : 2

=> [A] Shoot, [B] Bomb


Released in March 2002.

The game was sold by a Korean company, Oriental Soft. But was developed by the Japanese division, who are principaly formers from Psikyo and Seibu staffs.

This was the last game made by them because after the developement, the development staff didn't got they money because Oriental Soft in Korea suddenly disappeared. So, they established their own company, 'Triangle Service'.


Game's rom.

MAME Info:

0.115u3 [David Haywood]


- 0.138u2: David Haywood added default NVRAM to G-Stream.

- 0.135u3: Fabio Priuli added driver data struct and save states to G-Stream G2020.

- 0.133u2: Brian Troha added remaining PCB "U" locations to roms that didn't have for G-Stream G2020.

- 0.133u1: Brian Troha added basic PCB layout and added "U" locations to as many rom names as he could identify in a hi-res pic of the PCB for G-Stream G2020.

- 0.129u2: Mamesick restored previous cycle eating behavior in G-Stream.

- 0.129: Mamesick converted the G-Stream driver to use scanline interrupts, partial updates and raw video parameters.

- 0.125u7: Couriersud fixed duplicated inputs.

- 0.122u6: David Haywood removed speedups in the G-Stream driver which were breaking the game.

- 0.121u1: Aaron Giles optimized the hyperstone core, gaining ~50% speed improvement in most games. Implemented clock prescaling and corrected interrupt priority handling. Then fixed the clock speeds on the most of the games and killed most of the speed gains in quite a number of them (Sorry!). Changed E1-32XT CPU1 clock speed from 16MHz to 64MHz.

- 0.119u3: G-Stream driver update [Pierpaolo Prazzoli]: Changed to use a default NVRAM handler. Checked the inputs. Aligned the sprites. Added some comments about oki banking. Fixed sound1 rom loading. Removed 'Unknown' dipswitches.

- 0.115u3: David Haywood added G-Stream G2020 (Oriental Soft Japan 2002).

- 28th May 2007: David Haywood - G-Stream G2020 Part 2 at 4:37 PM: The video should now be fully emulated, however, there are still problems with the sound (some sample banking is not understood yet) There also seems to be a general problem with the game speed, it runs at 100% speed, but seems to spend most of the time polling the sound status register causing the game to run very very slowly. Not sure why it's doing that yet because the sound status register seems to be acting as expected, could be related to the banking problem tho. Thanks to Tormod for the PCB of this one in any case. It should be supported in the next update for any side-by-side comparisons. As pretty as it looks it's just a very generic Raiden Fighters wannabe.

- 28th May 2007: David Haywood - 2:03 AM: Streaming... Streaming...


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Romset: 33288 kb / 21 files / 11.2 zip

MAME XML Output:

       <game name="gstream" sourcefile="gstream.c">
              <description>G-Stream G2020</description>
              <manufacturer>Oriental Soft</manufacturer>
              <rom name="gs_prg_01.u56" size="524288" crc="0d0c6a38" sha1="a810bfc1c9158cccc37710d0ea7268e26e520cc2" region="user1" offset="0"/>
              <rom name="gs_prg_02.u197" size="2097152" crc="2f8a6bea" sha1="c0a32838f4bd8599f09002139f87562db625c1c5" region="user2" offset="0"/>
              <rom name="gs_gr_07.u107" size="2097152" crc="84e66fe1" sha1="73d828714f9ed9baffdc06998f5bf3298396fe9c" region="gfx1" offset="0"/>
              <rom name="gs_gr_11.u108" size="2097152" crc="946d71d1" sha1="516bd3f4d7f5bce59f0593ed6565114dbd5a4ef0" region="gfx1" offset="2"/>
              <rom name="gs_gr_08.u109" size="2097152" crc="abd0d6aa" sha1="dd294bbdda05697df84247257f735ab51bc26ca3" region="gfx1" offset="400000"/>
              <rom name="gs_gr_12.u110" size="2097152" crc="94b56e4e" sha1="7c3877f993e575326dbd4c2e5d7570747277b20d" region="gfx1" offset="400002"/>
              <rom name="gs_gr_09.u180" size="2097152" crc="f2c4fd77" sha1="284c850688e3c0fd292a91a53e24fe3436dc4076" region="gfx1" offset="800000"/>
              <rom name="gs_gr_13.u181" size="2097152" crc="7daaeff0" sha1="5766d9a3a8c0931305424e0089108ce8df7dfe41" region="gfx1" offset="800002"/>
              <rom name="gs_gr_10.u182" size="2097152" crc="d696d15d" sha1="85aaa5cdb35f3a8d3266bb8debec0558c860cb53" region="gfx1" offset="c00000"/>
              <rom name="gs_gr_14.u183" size="2097152" crc="6bd2a1e1" sha1="aedca91643f14ececc101a7708255ce9b1d70f68" region="gfx1" offset="c00002"/>
              <rom name="gs_gr_01.u120" size="2097152" crc="b82cfab8" sha1="08f0eaef5c927fb056c6cc9342e39f445aae9062" region="gfx2" offset="0"/>
              <rom name="gs_gr_02.u121" size="2097152" crc="37e19cbd" sha1="490ebb037fce09100ec4bba3f73ecdf101526641" region="gfx2" offset="200000"/>
              <rom name="gs_gr_03.u125" size="2097152" crc="1a3b2b11" sha1="a4b1dc1a9709f8f8f2ab2190d7badc246caa540f" region="gfx2" offset="400000"/>
              <rom name="gs_gr_04.u126" size="2097152" crc="a4e8906c" sha1="b285d7697cdaa62014cf65d09a19fcbd6a95bb98" region="gfx2" offset="600000"/>
              <rom name="gs_gr_05.u174" size="2097152" crc="ef283a73" sha1="8b598facb344eac33138611abc141a2acb375983" region="gfx2" offset="800000"/>
              <rom name="gs_gr_06.u175" size="2097152" crc="d4e3a2b2" sha1="4577c007172c718bf7ca55a8ccee5455c281026c" region="gfx2" offset="a00000"/>
              <rom name="gs_snd_01.u192" size="524288" crc="79b64d3f" sha1="b2166210d3a3b85b9ace90749a444c881f69d551" region="oki1" offset="0"/>
              <rom name="gs_snd_02.u194" size="524288" crc="e49ed92c" sha1="a3d7b3fe93a786a246acf2657d9056398c793078" region="oki1" offset="80000"/>
              <rom name="gs_snd_03.u191" size="524288" crc="2bfff4ac" sha1="cce1bb3c78b86722c926854c737f9589806012ba" region="oki1" offset="100000"/>
              <rom name="gs_snd_04.u193" size="524288" crc="b259de3b" sha1="1a64f41d4344fefad5832332f1a7655e23f6b017" region="oki1" offset="180000"/>
              <rom name="gstream.nv" size="8192" crc="895d724b" sha1="97941102f94923220d9beb270939f0ad9a40fe0e" region="nvram" offset="0"/>
              <chip type="cpu" tag="maincpu" name="E1-32XT" clock="64000000"/>
              <chip type="audio" tag="mono" name="Speaker"/>
              <chip type="audio" tag="oki1" name="OKI6295" clock="1000000"/>
              <chip type="audio" tag="oki2" name="OKI6295" clock="1000000"/>
              <display tag="screen" type="raster" rotate="270" width="320" height="240" refresh="60.000000" />
              <sound channels="1"/>
              <input players="2" buttons="4" coins="2" service="yes">
                     <control type="joy" ways="8"/>
              <driver status="imperfect" emulation="good" color="good" sound="imperfect" graphic="good" savestate="supported" palettesize="7168"/>

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