(Topic ID: 315868)

Anyone using a tl866ii plus programmer to flash AT27C040

By Ashram56

1 year ago

Topic Stats

6 posts
5 Pinsiders participating
Latest reply 1 year ago by Tuukka
No one calls this topic a favorite

You

You are not signed in!

Find in topic

Linked Games

Bram Stoker's Dracula Williams, 1993

You're currently viewing posts by Pinsider Ashram56.
Click here to go back to viewing the entire thread.

I'm trying to flash an updated ROM for a Dracula (no ghost rom created using a rom patcher).

I can read the content of the flash, but whenever I try to erase or program, I get an error (which is not very verbose... : Programming Error, and that's it)

Oddly enough
- if I read the content of the flash, and program it back, it does go through the programming procedure just fine (flash and verify)
- If I read the content of the flash, modify just ONE byte and attempt to flash, I get an error programming
- and of course, if I use a completely different binary, I get an error programming

Unfortunately, I don't have an alternate 27C040 EEPROM available, so can't figure out if it's a SW issue or a HW issue.

Thanks

Quoted from slochar:
If that's the part # you're using, it's a one time programmable one. So no changing. It's not electrically erasable, nor via UV lamp.
Get a blank one.
EDIT: You might need to just erase it with the UV lamp depending on what variant it is. Ones with the window are UV erasable.
The reason is you can reprogram it with the exact same code is that you're not changing anything. You would run into an issue with anything that would remove more bits though, when the eprom is blanked, all the bytes are $FF, and you remove bits via the burning process to get for instance $8F. If the game needs $8F there and you subsequently burn say $80, it should do it.
Back in the day (70s-early 80s) there were people that would progressively burn code onto eproms and have a vector table at the end that grew with each burn to point the code to the "correct" newest block. Eproms that held 2k were $70 each then. Ouch.

Thanks foe the clarification, reached the same conclusion.

Is there any erasable compatible eeprom I could use on wpc machines?

Promoted items from Pinside Marketplace and Pinside Shops!

You're currently viewing posts by Pinsider Ashram56.
Click here to go back to viewing the entire thread.

Reply

Wanna join the discussion? Please sign in to reply to this topic.

Hey there! Welcome to Pinside!

Donate to Pinside

Great to see you're enjoying Pinside! Did you know Pinside is able to run without any 3rd-party banners or ads, thanks to the support from our visitors? Please consider a donation to Pinside and get anext to your username to show for it! Or better yet, subscribe to Pinside+!

Help – Contact – About Pinside – Support Pinside – Top