![27c801 eprom programmer 27c801 eprom programmer](https://i.ytimg.com/vi/BGQn01sFs5w/maxresdefault.jpg)
It is possible that adding some capacitors may get it work. So if anyone out there can look at the schematics and try to find out any mistakes, it would be Great!. Problem is, that I don't understand the mapper-logic or the memory adressing of Z80 CPU, so I don't know ho to repair it. I have also redrawn the schematics by hand (tried much PCB software, but it is simpler to draw by hand for me). No "software error" screen, built in games work as if nothing is inserted in the cartridge connector. Tried with different bioses and SMS I and II. I have built the cartridge according to it, double- and triple-checked the wiring, but there is no response from the console. Unfortunatelly, the schematics turned out to be wrong. He had no idea if it would work, so I tried to build it. Okay its time to summarize last few months of my work on the 8mbit mapper:ĭuring my research I was contacted by TmEE who was kind enough to provide me with his mapper schematics. Last edited by jpx072 on Wed 7:03 pm edited 1 time in total Just one point that doesn't match, but i think that's the way it wrote the rom that the SMS didn't recognized. sms file with Uniflash on a 256KB Atmel flash-rom. I tried to make a Golden Axe cart into a Alex Kidd The Lost Stars. Now i really know why it didn't work, i have to burn it with a programmer, not the Uniflash software. I have measured which pins of the eprom and mapper are connected - check the picture.Īlso look at THIS VERY INTERESTING PAGE: ĮDIT made some small correction in the wired pic! (pin24Eprom->28Mapper, 23Eprom->40Mapper) It works without any rewiring, so I assume the original chip has the same pinout as the 512KB "27C****" eprom (27C4001, 27C040 and simillar).
![27c801 eprom programmer 27c801 eprom programmer](http://www.next.gr/uploads/65/sch.gif)
I did nothing to the rom, no editation, no conversion, no nothing. I simply desoldered the original chip and soldered to it's place Eprom ST M27C4001 burned using normal eprom programmer (Elnec Preprom-02aLV) with the 512KB *.sms rom. The rom "Afterburner.sms" (from internet) is 512KB, so I assumed the original chip on this cartridge is also 512KB. The mapper 315-5235 supports maximum 512KB.
#27c801 eprom programmer series#
Last edited by jpx072 on Fri 6:46 am edited 1 time in totalįirst look at - this is for the 512KB flash memory 29F040 (basically it is electronically erasable eprom, I am using UV light erasable eproms from series 27C****). I have bought a Game gear Sonic Blast which is also 8Mbit large, and there IS a mapper - 315-5912 !!! Is it the same as on the SMS ?ĭoes anybody know which other (cheaper) cartridges can be remade for accepting 27C801?Īny suggestion would be helpfull! THANKS! So I am asking you, when you have a copy of the original SonicBlast (or other SMS 8Mbit cartridge - like Street fighter): Can you post PCB scans of those cartridges? Is there any mapper? Or just one Rom-and-mapper-in-one chip? My next step was to find out what mapper uses the original Sonic Blast cartridge, with NO LUCK :( so far. So I´m guessing there is no way to make it work.
![27c801 eprom programmer 27c801 eprom programmer](https://m.media-amazon.com/images/I/51+mgKbOLQL._AC_SX355_.jpg)
It is because not all adress pins are correctly connected. I have tried to insert 27C801 8Mbit 8x1024 32-pin Eprom on the cartridge with the Sonic Blast rom inside, but all I got was the flashy emerald intro and then black screen.
![27c801 eprom programmer 27c801 eprom programmer](https://www.batronix.com/images/products/chips/DIP28-250-166.gif)
Can the After Burner's 315-5235 mapper handle bigger roms than 512KB? Just by replacing the 32-pin rom with 27C040 (27C4001) 512x8 32pin Eprom.īut I want to build a cartridge to accept SONIC BLAST ROM which is 1024KB in size. I have succesfully made a 4Mbit (512KB) cartridge from old After-Burner cart Master System 8Mbit Eprom Cart for Sonic Blast Posted: Fri 4:07 pmĬan anybody help me with building an 8Mbit (1024KB) eprom cartridge?