Sega genesis eprom. Akira (Prototype) From .

Sega genesis eprom Sonic the Hedgehog 2. Furthermore, these sizes generally are UVPROM and so if you This page is dedicated to Sega Genesis and Super Nintendo development. would it also be possible to write to an Mega Man: The Wily Wars (Europe uses EEPROM, Japanese release uses SRAM) Micro Machines '96 (Europe exclusive title) (EEPROM) Micro Machines 2 (Europe exclusive This is pretty how eeprom’s access are emulated in Genesis Plus (see eeprom. Note: EEPROM saving may not work for non-SEGA games because Sega Genesis ; Extract ROMs from AtGames Genesis Classic IGNORED Extract ROMs from AtGames Genesis Classic. 95 (15% off) Add to Favorites Test Cart PCB for Vincent from Canada created a website with EPROM contents of Vintage synthesizer. Sonic and Knuckles & Sonic 3 » Sonic the Hedgehog 3 » Streets of Rage » Ultimate Mortal Kombat 3 » Mortal If you're replacing chips on old sports carts then you'll need to make sure that whichever EPROM writer you select can support 40 pin and 42 pin memories. 01 $ 12. patreon I was reading threw threads here on the classic gaming board, and came across a battery back up thread. There are three buttons, A, B and C, which are #hack #megadrive #makeyourown #howto #retrogamingIf you're tired of searching the internet for information on making roms and find you are piecing things tog YM2612 Instrument editor lets you control the Sega Genesis FM sound chip in real time, access the main parameters of the Channel 1 and select which note to play. 0 and up cant be make into a obviously, games that need sram won't be able to save on these. 95: Report It: 2024-03-03: Time Warp shows photos of completed sales. Could I copy a small game on it and put the Eprom instead of the original ROM on the sonic cartridge? I know in the Sega Genesis world, raphnet created a tool call smd2bin I have a dead Lost Generations Sega Genesis Cartridge, its a Tengen and it dont work Sacrifice a Sonic 2 Cartridge (Get it for free by a friend) I wont get sure both Cards have the same megabit size (8mb) Trade the Eprom Chip form Lost We set out to design the definitive way to explore Sega's 16-bit and 8-bit era. This is a complete suite of functions for Sega Genesis/32X/Mega Drive. Hello, I'm a old time reader of racketboy but never posted anything. Sign in Product Actions. 01 $ 11. you just need an eprom type 27c400/27c800/27c160/27c322 and bride the correct pad at back In this video I will show you how to assemble your own SEGA MegaDrive/Genesis cartridge, using an erasable programmable ROM chip, a so called EPROM. Trade Count: Full Member; Offline; Posts and others I picked up this Steam Sega console with the sole purpose of officially speedrunning Genesis games. 4 forks. Readme License. 6M Sega Genesis/Megadrive Controls: Press the 1 key to start games. 6. This made me think, what games have battery back up saving for the SEGA GENESIS CARTRIDGE ID TABLE STANDARD FORMAT FOR SEGA OF AMERICA NOV 26 1990 SEGA OF AMERICA ;***** check_sum egu $0000 ORG $0100 , dc. Navigation Menu Toggle navigation. Write "SEGA GENESIS" Mega Drive "SEGA 32X" Mega Drive + 32X "SEGA EVERDRIVE" Mega Drive (Everdrive extensions) "SEGA SSF" Mega If the game has EEPROM instead, the field Welcome to the Sega Genesis Community on Reddit! Talk about the Sega Genesis/Megadrive, games, peripherals, and upcoming projects! Please stay on topic, and enjoy! Or dump the This board uses the common 27C322 EPROM. Those ca Hi all, I am not sure if I am doing something wrong or this feature of the Sega Genesis is not quite active yet, but Genesis/Megadrive games that utilized the EEPROM to MY ETSY SHOP : https://www. 0; An old controller to use the cable or DB9 connector (you’ll have to cut the right corner Download section for Sega Genesis / Megadrive ROMs. Hello Everyone SO i just started to play with Sega Cartridges Turned out really easy . 4. Furthermore, What's involved in making a Sega Genesis reproduction game cartridge? We'll look at the full start-up cost for both basic cartridges and SRAM battery backup In this video I will show you how to assemble your own SEGA MegaDrive/Genesis cartridge, using an erasable programmable ROM chip, a so called EPROM. I bought a Willem Eprom programmer I know in the Sega Genesis world, raphnet created a tool call smd2bin for his It supports up to 16Mbit ROMs and up to 32KB of save RAM in either battery-backed SRAM or FRAM. For those of you wanting to restore vintage synths this could be a very valuable Compilation of BIOSes for various emulation platforms - retroarch_system/Sega - Mega Drive - Genesis/rom. Sega Genesis/Megadrive Controls: Press the 1 key to start games. Supports ROM sizes 16mbit - 32mbit, using 27c160 and 27c322 chips. Newer Post Older Post Home. This should be all the licensed commercial Compilation of BIOSes for various emulation platforms - retroarch_system/Sega - Mega Drive - Genesis/rom. Genny in depth. A prototype of the unreleased Ninja Gaiden for the Sega EPROM Support: M27C160 (2MB/16Mb) M27C322 (4MB/32Mb) Capacitor (C1): 47uF, 16v; Capacitor (C2): 1uF, 50v; Supported Systems: Sega Genesis/Mega Drive/32x Consoles; Since the release of the Mega Everdrive Pro (and MegaSD) SegaCD/MegaCD games can be played on the console without actual CD addon hardware being attached straight from the flashcart. Report repository A Mega Drive/Sega Genesis with cartridge slot or SD card slot and with two controller ports; You need a intermediate to advanced knowledge in C and C++, regarding the use of SGDK and Posts about Genesis Reproductions written by Bucket Mouse. also engaged in some business with Dyer back in 1996 or 1997 when he traded a Vectrex 3D imager box for five Genesis and three SEGA CD prototypes, Nightmare Circus The factory chip is called a Mask ROM not an EPROM. Use Arrow EPROM Cartridge: Lot: Old Scene (BBS) Files: SONIC2. This is the fixed revision that works fine One PCB contained an EPROM that had one part of the game burnt twice but is otherwise the same exact build as the other functioning one. Sega Mega Converter Schematic - Here are schematics so you First, the Genesis version has a little promoted and used mode to test hardware, which includes Z80 RAM, a memory viewer, a controller test, Sega CD RAM (Work and Program), Sega CD communication registers and a Sega CD BIOS If you aren’t planning to do much EPROM programming in the future, just those two carts, you’ll be money ahead if you go with an EPROM vendor that can program them for you. I think 32X games are identified by having a different system signature in the cartridge header, something like SEGA GENESIS 32X rather than SEGA MEGA DRIVE or AFS ROM Suite MD - New program for working with EPROM/FLASH and others. who support 4mo max rom size with 32kb of FRAM. Sega Contribute to Vakon84/Genesis-FeRAM-Cart development by creating an account on GitHub. Quote. Eprom Saves - The Mega SG core supports Eprom saves on the carts which had this which we don't currently have in the Genesis core. c for more details). I think the max A open Sega Genesis cartridge PCB. Originally intended to "beat" the Nintendo Entertainment System (NES), it ended up competing against Soul Blade is a bootleg port of the Playstation game of the same name by an unknown developer in 1997. net forums who initially give me indications about ROM Cartridge for Sega MegaDrive (Genesis) Topics. This is the cheapest most cost-effective SEGA Genesis Classics ROM Packer. MPL-2. Sega Genesis Prototyping Cartridge (32Mbit, 4Mbit, 16Mbit) Homebrew 40pin Sega Genesis Cart (made from Taz: (SNES/Genesis) Willem Enhanched EPROM Sega Genesis / Sega CD / SNES / Master System / Game Gear emulator - jsgroth/jgenesis. Sonicology Contains many useful Sonic ROM hacking guides. Sega Genesis/Megadrive Controls: Re: Sharing my project: A Sega Genesis Cartridge PCB with FeRAM support Post by Markfrizb » Tue Oct 20, 2020 3:22 pm lidnariq wrote: ↑ Tue Oct 20, 2020 2:41 am I don't Author Topic: Making SEGA Genesis cartridges (Read 56916 times) 0 Members and 1 Guest are viewing this topic. IC1 EPROM (“1”) IC2 EPROM (“0”) IC3 EPROM (“3”) IC4 EPROM (“2”) IC5 Pin 1 on the ROM is running to B7. 0 license Activity. The total size is 256K, you can hook up larger eproms if you wish. Files Sonic the Hedgehog 3 (EPROM prototype) External links. work too for 32x game , without save feature for all. Forks. db at libretro · Abdess/retroarch_system Sega Megadrive/Genesis development. If you'd like to get into genesis development, I think the genesis This PCB fits both SEGA OEM and Electronic Arts styled cartridge shells. 20 stars. Because $200000 addresses directly to the EPROM would return sixteen bits, not 8, implying $200000 is the start of the The date of this ROM has been confirmed to be accurate by comparing the date written on an EPROM copy of the same revision. 1031 games available, browse by popularity and rating. 4 . bobbyb13. The cost is quite low (if you have a programmed Labels: chipmusic, chiptech, sega mega drive / genesis. the other 42 non ninja, gaiden, sega, mega, drive, genesis, eprom, rom, prototype, unreleased Language Japanese Item Size 1. b 'SEGA Notes. . spike in price? 2 posts, worms, prototype, genesis, sega, mega, drive, eprom, rom Language English Item Size 2. db at libretro · Abdess/retroarch_system Official Sega Megadrive games use One Time Programmable EPROM you can't even erase them it works only on read mode. No video signal. plus-circle Add Review. Reflashing options is for Third party cartridge based on This is basically a mod on the game Phantasy Star. bin file The Sega cd does use an ML style rechargeable battery for its saves though, so playing it for an hour here and there will recharge it, though they are old and the batteries are losing capacity. The board also accepts the commonly used 27C160 as well. With the prices of genesis games going up high like Cheech and Chong, to the Mega Everdrive X3 is that it It’s just a mixture of EPROM/diode logic and a digital gate array. ROMs are burned to the carts by using a standard TL866CS A Sega Genesis repro PCB with FeRAM support. Note: EEPROM saving may not work for non-SEGA games because Finally, the last weakness of the Mega Everdrive v1 and the Everdrive MD is that it does not support games which save to EEPROM. 2b Repro Sega Genesis 32X Video Game Cartridge Homebrew Wileytronics 5 out of 5 stars. Trade Count: Full Member; Offline; Posts Yep, remove Converting Genesis EEPROM games to Battery Save 02-13-2013, 11:10 PM. Does A viewer sent me a mystery Sega Genesis Cart. Subscribe to: Post Comments (Atom) About Me. the respective address line Top 25 Sega Genesis ROMs. [1][2][3] Genesis: List of Genesis The original Sega controllers came with a 3 button layout as well as the gamepad and the center keys. Contribute to GMMan/PscdPack development by creating an account on GitHub. Pin 42 is being pulled high to 5V. A reimagining of the underdog that led a 16-bit revolution. This Sega Genesis/Mega Drive 68k assembler demo. pak files and to make your own for use with the emulator. This is a tribute to the classic game "Frog Bog". However, to my moderate surprise, Summer A simple and cheap cartridge to eprom adapter for SEGA Megadrive and Genesis. Sega Genesis 4 MB Game Save Cartridge Pinout. 1080p. Here’s a quick guide on how to populate my custom designed Genesis/Mega Drive reproduction PCBs. 95 Original Price $12. comment. By arpruss September 3, 2022 in There is also an If you open a BIOS image in a text editor and can read text like "SEGA MEGA CD" (or something like that), then it needs to be byteswapped so it reads something like "ESAGM SEGA Genesis Mini; Is there a way to save your game/make save states? Topic Archived; More Topics from this Board. Open the cart and use a pink pencil eraser to really clean the contacts on the cart. As part of that I’ve been looking at building a tool For Genesis on the Genesis, If there is no battery, and it is eeprom sram, don't give up hope. It supports most Genesis games. Works with a variety of M27Cxxx EPROMs, just solder the respective jumper on the back of the PCB Pcb for UV eprom for make homemade repros for genesis / megadrive. Engineered with an FPGA. By contrast, the Sega Genesis was released late in the 80s (1988/89) and no success in the far east. Sega Genesis/Megadrive Controls: Press It's a PCB for making Genesis / Megadrive games, with on-board save or without. etsy. Here's a quick guide on how to populate my custom designed Genesis/Mega Drive reproduction PCBs. During my testing, I listed those EPROM Cartridge - Basic schematic to show how to hook up two 128K eproms to a Sega Genesis cartridge. (NES), it MaarioS wrote:I get sick of using 27C322 (4MB) EPROMs and erasing them all the time when I want to program something else, not to mention they mostly fail to erase All games on the Sega/Mega CD are region locked. I use a Megadrive 1 because it has a convenient headphone output. Trade Count: Full Member; Offline; Posts I This is a brief video to go over the steps involved in building your own reproduction Sega Genesis/Mega Drive carts. The first two is how Sega opted to We did a live trial of video games in Columbia, South Carolina. This project was born as way to use 3. EPROMs are Erasable programmable ROMs. Trade Count: Full Member; Offline; Posts Introduction This tutorial is a step-by-step guide on how to make your very own 32KB Sega Master System cartridge. It uses a The Sega CD 2 has three BIOS versions and you’ve got to match the BIOS to the system BIOS version that's currently installed or else some features will not work correctly; an I bought this flash cart for my model 1 sega genesis 2 weeks ago. EPROMs for the genesis will Sega Genesis rom/sram address mapping. Those ca A open Sega Genesis cartridge PCB with save feature. io has the largest selection of SG ROMs and SEGA Genesis Emulators. How to Program: Use an EPROM programmer and load the ROM file; be sure it is Many things can be done with such a cartridge: You can develop your own applications or games and try them on real hardware instead of using an emulator. Mask ROMs are set in factory and cannot be changed. DownloadROMs. . I have spent the last hour or so working on getting the rom lobo, prototype, eprom, rom, sega, mega, drive, genesis Language English Item Size 3. An NTSC prototype of the Worms port for the Sega Mega Drive. In this episode we analyze it, dump it and learn of its origins. Skip to This will create a bin/main. Post by Soniccd123 » Fri Jul 31, 2020 5:31 pm. As an aside, my Sega cd on original battery still EPROM cartridge: EPROMs: 4x MJ: Labels: PRE-PRODUCTION SAMPLE Michael Jackson's Moonwalker PROPERTY OF SEGA OF AMERICA, INC. So there are Different types of In this 2nd part of the Sega Genesis Eprom video, I will show you how I got Sonic & Knuckles working on my JAMMA Genesis in my Arcade Cab. LZH: Game: Ren & Stimpy: Stimpy's Invention: System: Sega Mega Drive: Genre: Platformer: Final Features many cut levels. Sonic the Hedgehog. need use an 27c400/800/160/322 eprom , and solder JP1 Basically, you need something that can program the EPROM (27C160 or 27C322 depending on the game size, you could even go with 27C800 or 400 for smaller games), and you need to This program allows you to extract ROMs from SEGA Genesis Classics . For this no need Welcome to the Sega Genesis Community on Reddit! Talk about the Sega Genesis/Megadrive, games, peripherals, find a compatible eeprom chip, find an eeprom burner, soldier the Jim Power: The Lost Dimension in 3-D (Genesis prototype) John Madden Football (Nov 7, 1990 prototype) Jungle Strike (prototype) Junker's High (Prototype B) Jurassic Park The only limit is usually the cost of an EPROM programmer, If you don’t have an SNES lying around, it’s possible to perform a similar end-around on a Sega Genesis as well. Contribute to SifuF/mega-drive-demo development by creating an account on GitHub. Works on Windows. Unlike the original Master System or SG-1000 systems, SEGA provided third party developers with some tools to make Mega Drive development easier. Quick links. Comment: Includes 1 Sega Genesis Model 1 Console, 1 6 or 3 Button Original Sega Genesis Controller (Depending on what I have avaliable), an AV or RV Cable, and an original power SEGA GENESIS II MEGA DRIVE PALBIG RGB NO 001 JUNE 1993 PAL PAL-B-I-G; If you have any question about repairing write your question to the Message board. S2B A sited devoted to research on Sonic 2 Beta. To The EPROMs that make up the working prototype were dumped individually with an EPROM programmer to ensure that the EPROMs had no issue. patreon. We partnered with Sega, and had 10 Blockbuster stores carry single blank videogame SKU (a re-writable EPROM cartridge: Game: Sega Channel: System: Sega Mega Drive: Genre: Service: Release date: JP May 1994 US Jun 1, 1994 EU Jul 1, 1996: Notes. Teensy (ATmega32u4 USB dev board) 2. e. but I also have a wonderboy IV cart that was made from a FIFA cart with sram, which plays and saves great. 2 posts, 1/22/2023. This will allow you to use the Mega CD with Test Cart PCB for Sega Genesis / Mega Drive w/ 42 pin EPROM Socket [eBay] $12. pbj. The ones marked EEPROM are Sega Genesis Hardware Internals - Revised: 04/07/1993 An up-to-date version of this file can be gotten by anonymous ftp to read it with a EPROM programmer, there may be situations And finally, you have Sega CD audio tests that allow you to play back sine wave on teh PCM chip and also test the Sega CD drive for CD-DA playback, tray operation and also It was the first console released in the 16-bit era, albeit still utilizing a 8-bit CPU. Skip to content. Your simplest fix is going to be cutting the trace on the back of the board for pin 42, and running a Robert S. No emulation. a PAL Sega Genesis MegaDrive Mini ROMs are out! Resource The original game didn't use SRAM (one of the few to use EEPROM saving) and M2 definitely modified it for release on the Mini Sega Mega Drive / Genesis. The Genesis version was released under the name, "Soul Blade Super", which the U1 EPROM (“MO 1” / “6/25 56” / “CE41” ) U2 EPROM (“Real Monsters 7/7/95”) U3 U5 18412 / MM74HC139N / MC74HC139N 16 MEGABIT REV A; More information on BlastEm is an open source, higly accurate emulator for the Genesis/Megadrive that runs on modest hardware. Use Arrow Keys to move up, left, right and down. The X7 Author Topic: Making SEGA Genesis cartridges (Read 56537 times) 0 Members and 1 Guest are viewing this topic. This is the All of Sega's program ROMs have a string that looks like this: <type>-<number> The ROM type can be the following: EPR - EPROM MPR - Mask ROM OPR - One-time Re: Making SEGA Genesis cartridges « Reply #157 on: February 03, 2023, 11:06:49 pm » Well, Xiaou2, you’ve either been a bad or good influence but you were an I know some Accolade games do have batteries, though; the Genesis Hardball games that save have batteries onboard. Reviews Reviewer: aiedyn - favorite favorite favorite Author Topic: Making SEGA Genesis cartridges (Read 55216 times) 0 Members and 2 Guests are viewing this topic. Sega Genesis/Megadrive Controls: Press the 1 key to start EEPROM support is one of those things that no one is motivated to do or if you request a feature you are met with a response of "If you want it so much do it yourself", ↳ Author Topic: Making SEGA Genesis cartridges (Read 53838 times) 0 Members and 1 Guest are viewing this topic. This page is about some of the hardware I've acquired for development and testing on the real hardware (not just Emulators), also this is an Sega Megadrive/Genesis , 4Mo FRAM save repro PCB. it EPROM cartridge: Lot: Old Scene (BBS) Files: PR-RENST. 0 comments: Post a Comment. Consider supporting me - https://www. In addition, the vast majority of CD units will only function on Genesis/Mega Drive consoles that match their region (i. It is the first emulator to properly run Titan's impressive Overdrive 2 demo 32X Doom Resurrection v2. FAQ; Feed; Logout; Register; SpritesMind. Just wondering what would be involved in this? I know each game is different EEPROM saving-wise but it would be An early prototype of the unreleased Akira for the Sega Mega Drive. Forum. Contribute to soniccd123/Genesis-FeRAM-Cart development by creating an account on GitHub. need use an I was wondering if anyone could please let me know the proper way to wire a 27c160 (dip42) to a 40pin GENESIS PCB? long time ago i uses many times 27C160 and Sega Megadrive/Genesis development. srg320 very nice to find this! i've been programming last few day for the sega genesis and like to make a cartridge containing my program. It's great to test homebrews,games ,to test eprom prior to solder it for cart mo Added Mega Casanova 3 for SEGA Genesis / Mega Drive since the game is planned to be released in 2022. 0M . It was developed in KiCAD and tested in real hardware. 3V parts safely for repro carts but, with the use o Flash memory, the read/write potencial of the ROM made me develop it to another direction: A Download and play SEGA Genesis ROMs for free in the highest quality available. DATE CODE 4-24-90: Sega Genesis/Megadrive Controls: Press the 1 In-game menu supported for Genesis and Master System modes; Full EEPROM saves support; Real time clock for logging date and time of saves; Best and only cartridge you'll ever need Sega Mega Drive (Genesis) SDK. 100% fast downloads! You'll need to desolder the original BIOS, solder a 40-pin socket in its place and then program a 27C1024 EPROM with the region-free BIOS ROM. 3 watching. cartridge sega-mega-drive sega-genesis flashcart Resources. Stars. com/ie/shop/olonguetPATREON : http://www. The cartridge has been modified Gold for the SEGA Genesis was a heavily rewritten port of the third-generation Amiga version with updated art. Trade Count: Full Member; Offline; Posts Yep, remove those chips above your eprom and then add HD Retrovision Test ROM (with source) for Sega Genesis- v1. LZH: Game: Sonic the Hedgehog 2: System: Sega Mega Drive: Genre: Action Platformer: Final build: Sep 29, 1992 I am pleased to annouce that Frog Feast is released on the Sega Genesis/MegaDrive consoles. This list was compiled with corrections from multiple lists. From a technical view there are 2 main A working Sega Megadrive (Genesis). This projects uses a 27C322 4MB EPROM Chip and a FM1808 32KB FeRAM as save storage. Sega Genesis/Megadrive Test Cart PCB for Sega Genesis / Mega Drive w/ 42 pin EPROM Socket Reproduction (221) Sale Price $11. Create your own game reproductions or homebrew games with this programmable Sega Genesis/Mega Drive cartridge (bare PCB) by Electronic Arts. Arrives soon! (v3. For ROMs that came from cartridges with built-in SRAM or If you have a sega cd I can give you instructions on how to make it run on the sega cd. ROM, rom hack, sega. Akira (Prototype) From it was discovered that one of the later EPROMs on the non working one was a duplicate burn of cylums-sega-genesis-rom-collection Scanner Internet Archive HTML5 Uploader 1. If you use the ever popular TL866 or TL866ii Plus an Sega Megadrive/Genesis , 4Mo FRAM save repro PCB . >Subscribe The below list of Genesis and 32X games use a save battery in the cartridge to retain save data. all parts are DIP , easy to assemble yourself. Or if you want, you can send me a ROM file and I will try to test it on my console for you. Watchers. In the actual state, this If you're replacing chips on old sports carts then you'll need to make sure that whichever EPROM writer you select can support 40 pin and 42 pin memories. Zero EPROM cartridge: Labels: STONE PROTECTORS Vic Tokai Inc. Automate any Sega Genesis ; Everdrive-MD info and questions IGNORED Everdrive-MD info and questions. Run it in any emulator (we test using higan), put it on a flash cartridge (like the Super Everdrive), or burn it to an EPROM and I’ve recently been getting into collecting for the Sega Megadrive/Genesis, it’s the one console I had most contact with as a kid. 5M . If you want to save your created sounds or use them into YM2612 You may also like these Sega Genesis ROMs Shinobi III - Return of the Ninja Master: Teenage Mutant Hero Turtles - The Hyperstone Heist: Earthworm Jim: Revenge of Shinobior these Sega Genesis Fighting/Beat 'Em Up ROMs! A friend of mine made and gave me some sega genesis carts with unlicensed roms and hacked games inside; Also the eprom sandwich trick is a very cool way to SEGA Genesis Classics ROM Packer. By Yurkie October 17, 2011 in Sega Genesis. Sign in Product GitHub Copilot. Dump method: Retrode: Game: Stone Protectors: System: Sega Mega Drive: Genre: Action: Release date: Regen is an accuracy focused emulator which can emulate the following Sega console and computer systems with very high degree of accuracy: Genesis/MegaDrive; Master System; There are about two dozen Sega Genesis/ Mega Drive games that do not use the typical SRAM or similar methods to save games, instead they use serial EEPROM. In the new episode, This comes from an original out of the 39 SEGA GENESIS games on this console, only 1 of them is worth playing: SHADOW DANCER, the other Sega Genesis games are junk. As for games, the Sega Genesis had a huge number of games that you can play on it. com/msxmansionChannel Musics available at : Author Topic: Making SEGA Genesis cartridges (Read 57027 times) 0 Members and 3 Guests are viewing this topic. Thanks a lot to 8bitwizard from spriteminds. I had to modify th Real Monsters for the SEGA Genesis and the Super Nintendo at E3 in 1995, U4 EPROM (“MO 2” / “6/25 56” / “FD68”) U5 18412 / MM74HC139N / MC74HC139N 16 MEGABIT REV A.