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ebases: MAME ROM Information.


Extra Bases [Upright model] (c) 1980 Midway.

An old baseball game.


Bally Midway Astrocade hardware.

[Game No. 761]

Main CPU : Z80 (@ 1.789773 Mhz)

Sound Chips : Astrocade (@ 1.789773 Mhz)

Screen orientation : Horizontal

Video resolution : 320 x 204 pixels

Screen refresh : 60.00 Hz

Palette colors : 256

Players : 2

Control : trackball

Buttons : 1


Released in April 1980.

Also released as "Extra Bases [Cocktail Table model]".


1. Tornado Baseball (1976)

2. Extra Inning (1978)

3. Extra Bases (1980)


Game's rom.

Machine's picture.

MAME Info:

0.31 [Alex Judd]

Artwork available


- 0.145u4: hap fixed trackball in Extra Bases.

- 23rd October 2009: Mr. Do - Kiltron did a nice cleanup job on Extra Bases, which was on loan from Vintage Arcade. Backdrop to come at a later date (hopefully).

- 0.115u2: Changed visible area to 352x240.

- 0.115u1: Changed Z80 CPU and Astrocade clock speeds to 1789772 Hz and VSync to 60.054442 Hz. Added 'Cabinet' dipswitch.

- 0.37b6: Added 'Monitor' dipswitch.

- 0.37b1: Changed visible area to 320x204.

- 29th March 2000: Nicola Salmoria added better emulation of Astrocade hardware palette registers, affecting Extra Bases, Seawolf 2 and Robby Roto.

- 0.36b10: Changed 4-way Joystick to Trackball and 3 players.

- 0.35RC2: Changed visible area to 320x192.

- 17th November 1999: Zsolt Vasvari fixed Extra Bases, which is now playable.

- 0.34b4: Emulation of the Astrocade sound chip (Extra Bases, Gorf, Robby Roto, Space Zap and Wizard of Wor) [Frank Palazzolo]. Added 1x Astrocade sound.

- 0.31: Alex Judd added Extra Bases (Midway 1980), not playable.

- 4th April 1998: Dumped Extra Bases.

LEVELS: 1 (endless)


- Press PITCH button to start pitch

- Rollerball controls pitch and moves outfielders

- Press BAT button to swing bat

- Hold button down to advance runners

Recommended Games (Baseball):


Tornado Baseball / Ball Park

Double Play

Extra Inning

Atari Baseball

Extra Bases

Chance Kun

Barroom Baseball

Champion Baseball

Champion Base Ball Part-2

Baseball (PlayChoice-10)

FamicomBox (Baseball)

Vs. BaseBall

Curve Ball

Victorious Nine

The Koukouyakyuh


Major League

Super Major League

Super Major League '99

World Series Baseball / Super Major League

Pro Baseball Skill Tryout

World Series: The Season

Baseball The Season II

Vs. Atari R.B.I. Baseball

Super Baseball Double Play Home Run Derby

Super League

Excite League

Moero Pro Yakyuu Homerun

Stadium Hero

Stadium Hero 96

Strike Zone Baseball

World Stadium

Baseball Stars: Be a Champ! (PlayChoice-10)

Bottom of the Ninth

Capcom Baseball


Jitsuryoku!! Pro Yakyuu


Super Champion Baseball

Tommy Lasorda Baseball (Mega-Tech)

Ah Eikou no Koshien

Baseball Stars Professional

Baseball Stars 2

Dynamite League

Kyuukai Douchuuki

2020 Super Baseball

Clutch Hitter

Power League IV (Tourvision PCE bootleg)

Relief Pitcher

Super World Stadium

Super World Stadium '92

Super World Stadium '93

Super World Stadium '95

Super World Stadium '96

Super World Stadium '97

Super World Stadium '98

Super World Stadium '99

Super World Stadium 2000

Great Sluggers

Great Sluggers '94

Super Major League

Wonder League Star

Dynamite Baseball

Dynamite Baseball 97

Dynamite Baseball '99

Dynamite Baseball NAOMI

Wonder League '96

Powerful Baseball '96

Powerful Pro Baseball EX

Home Run Classic




Ninja Baseball Batman

Funcube 3

Romset: 16 kb / 4 files / 11.8 zip

MAME XML Output:

       <game name="ebases" sourcefile="astrocde.c">
              <description>Extra Bases</description>
              <rom name="m761a" size="4096" crc="34422147" sha1="6483ca1359b675b0dd739605db2a1dbd4b7fb8cb" region="maincpu" offset="0"/>
              <rom name="m761b" size="4096" crc="4f28dfd6" sha1="52e571e671fa61b0f9ab397a5947094c24f6c388" region="maincpu" offset="1000"/>
              <rom name="m761c" size="4096" crc="bff6c97e" sha1="e41fb9db919039c8a48b4caebf80821a066d7ccf" region="maincpu" offset="2000"/>
              <rom name="m761d" size="4096" crc="5173781a" sha1="e60c3f4b075f8b811ff6a8637c4aa0b089847a82" region="maincpu" offset="3000"/>
              <chip type="cpu" tag="maincpu" name="Z80" clock="1789772"/>
              <chip type="audio" tag="mono" name="Speaker"/>
              <chip type="audio" tag="astrocade1" name="Astrocade" clock="1789772"/>
              <display tag="screen" type="raster" rotate="0" width="352" height="240" refresh="60.054442" pixclock="7159090" htotal="455" hbend="0" hbstart="352" vtotal="262" vbend="0" vbstart="240" />
              <sound channels="1"/>
              <input players="2" buttons="1" coins="2" tilt="yes">
                     <control type="trackball" minimum="0" maximum="255" sensitivity="50" keydelta="10"/>
              <dipswitch name="Monitor" tag="P2HANDLE" mask="16">
                     <dipvalue name="Color" value="0" default="yes"/>
                     <dipvalue name="B/W" value="16"/>
              <dipswitch name="Cabinet" tag="P2HANDLE" mask="64">
                     <dipvalue name="Upright" value="0" default="yes"/>
                     <dipvalue name="Cocktail" value="64"/>
              <dipswitch name="2 Players Game" tag="P3HANDLE" mask="1">
                     <dipvalue name="1 Credit" value="0" default="yes"/>
                     <dipvalue name="2 Credits" value="1"/>
              <dipswitch name="Unused" tag="P3HANDLE" mask="2">
                     <dipvalue name="Off" value="0" default="yes"/>
                     <dipvalue name="On" value="2"/>
              <dipswitch name="Unused" tag="P3HANDLE" mask="4">
                     <dipvalue name="Off" value="0" default="yes"/>
                     <dipvalue name="On" value="4"/>
              <dipswitch name="Unused" tag="P3HANDLE" mask="8">
                     <dipvalue name="Off" value="0" default="yes"/>
                     <dipvalue name="On" value="8"/>
              <dipswitch name="Unused" tag="P3HANDLE" mask="16">
                     <dipvalue name="Off" value="0" default="yes"/>
                     <dipvalue name="On" value="16"/>
              <dipswitch name="Unused" tag="P3HANDLE" mask="32">
                     <dipvalue name="Off" value="0" default="yes"/>
                     <dipvalue name="On" value="32"/>
              <dipswitch name="Unused" tag="P3HANDLE" mask="64">
                     <dipvalue name="Off" value="0" default="yes"/>
                     <dipvalue name="On" value="64"/>
              <dipswitch name="Unused" tag="P3HANDLE" mask="128">
                     <dipvalue name="Off" value="0" default="yes"/>
                     <dipvalue name="On" value="128"/>
              <driver status="good" emulation="good" color="good" sound="good" graphic="good" savestate="supported" palettesize="512"/>

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