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Sega G-80 Multigame Instruction Manual
Version 1.0
Copyright © 1998, Clay Cowgill
clayc@diamondmm.com
Copyright © 1998, Clay Cowgill Multigame, Version 1.0 Sega G-80
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Notice Regarding this Upgrade Warning! • • • Credits and Thanks: multi- Al MarkJ, JoeW, Introduction: Copyright © 1998, Clay Cowgill Multigame, Version 1.0 Sega G-80 around and generally keep me motivated. vectorlist” people that helped bounce ideas PaulK, and the rest of the “ ZonnM, RayG, G-80 simulator program so I could use it to modify the original games as needed. handy reference guide. Al also provided me full source code to his Macintosh Sega G-80 system into a Al has been compil
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PROM. When installed on the CPU board of Getting Started: Remove the CPU and EPROM card: Make SURE you mark or somehow identify where the cables need to re-connect to the cards! Copyright © 1998, Clay Cowgill Multigame, Version 1.0 Sega G-80 the most cables attached to it). cards inside the card-cage. You will need to remove the cables connected to the CPU board (the one with “card cage”. Depending on the machine, you might need to remove a metal cover to gain access to the Start with the
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Copyright © 1998, Clay Cowgill Multigame, Version 1.0 Sega G-80 Put the EPROM card somewhere safe. You won’t need it in your game anymore. have different numbers of chips on it. It will look something like this: release levers on the EPROM card and remove it as well. The EPROM card for different games will Locate the EPROM card (it should be the only card without any cables attached to the end). Press the the card hasn’t been removed in 15 years…) The CPU card looks like this: Press the “r
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Upgrading the CPU card: • U15 – a 16 pin PROM • • U25 – a 24 pin 2K EPROM • U22 U15 U25 U21 Copyright © 1998, Clay Cowgill Multigame, Version 1.0 Sega G-80 all the pins line up and go into the socket. text should be “right-side up” as you look at it. Press it firmly into the empty socket at U21. Make sure Daughtercard. (The Multigame Security Plug” and orient it so the “notch” is facing the Take the “G80 all the pins line up and go into the socket. should seat with a “chunk” sound. The c
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Put it back together and test: Copyright © 1998, Clay Cowgill Multigame, Version 1.0 Sega G-80 before shipping, so there shouldn’t be any surprises. and check your work. Look for bent pins and pins that are out of the sockets. The kit is hand-tested start as normal. If you don’t get a picture after a few moments, turn the game off, remove the CPU card intro-screen should to set to allow the machine to run with the door open. Turn the machine on. A game power to the machine on. Depending
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Try it out: Game Spinner “Warp” “Photon” “Thrust” “Fire” photon thrust Eliminator - thrust - thrust - - - - thrust Option Notes Eliminator (Table continued on next page) Copyright © 1998, Clay Cowgill Multigame, Version 1.0 Sega G-80 know why. Your mileage may vary. Note—this seems to work fine on some machines, but hangs on others. I don’t Eliminator control panel and control adapter to play 4-player games of Eliminator. 4 player Eliminator, with no control changes. You can use this with a
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Adding a “menu” button: A note about sound: Sound Card Type Games that use it Eliminator Eliminator, . Copyright © 1998, Clay Cowgill Multigame, Version 1.0 Sega G-80 technical know-how. in” support for switching speech, but there’s nothing stopping you from doing it yourself if you have the Zektor, Star Trek, and Space Fury. Once again, there’s no “built Speech boards are compatible between with either living with one sound card or making your own switching-system. soundcard, but for now yo
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Technical information: This pinout is as follows: D0 D1 D2 D3 D4 D5 D6 D7 snd_map: ; D7654 3210 . db h'10 ; star trek 0001 0000 (USB) . db h'21 ; eliminator 0010 0001 ( elim/ zek) . db h'42 ; space fury 0100 0010 ( sf) . db h'13 ; tac/scan 0001 0011 (USB) . db h'24 ; zektor 0010 0100 ( elim/ zek) . db h'25 ; elim 2p 0010 0101 ( elim/ zek
