Hot rodding a 27C128 dinosaur
- krusty
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Hot rodding a 27C128 dinosaur
I am trying to put together a smarter type of RT and need to swap the EPROM to an EEPROM with 512k or better to allow $12P to operate.
What's the way to go?
What's the way to go?
- antus
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Re: Hot rodding a 27C128 dinosaur
You need nvram for RT (real time). 256kbit is 32kb which is enough for $12p. the 27cXXX chips (eprom) are pin compatible with 29cXXX (eeprom) so you can just swap one right in. You'll need to pull it out and either use an adaptor on the whole memcal, or put the chip in a socket so you can pull the chip out the memcal, then you'll be able to erase and write without bothering with the uv erase cycle. Its a step up, but it wont give you realtime.
Have you read the FAQ? For lots of information and links to significant threads see here: http://pcmhacking.net/forums/viewtopic.php?f=7&t=1396
- krusty
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Re: Hot rodding a 27C128 dinosaur
I already have RT but it's not my car so I want to have a dedicated tuning memcal with the capacity to run $12P and also make a 512k standard but EEPROM memcal to run in the car between tuning sessions which will only be fortnightlyantus wrote:You need nvram for RT (real time). 256kbit is 32kb which is enough for $12p. the 27cXXX chips (eprom) are pin compatible with 29cXXX (eeprom) so you can just swap one right in. You'll need to pull it out and either use an adaptor on the whole memcal, or put the chip in a socket so you can pull the chip out the memcal, then you'll be able to erase and write without bothering with the uv erase cycle. Its a step up, but it wont give you realtime.
Re: Hot rodding a 27C128 dinosaur
Use a 27sf512 ,its a direct drop in.
- krusty
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Re: Hot rodding a 27C128 dinosaur
I have a 27C256B soldered in place of the old 128 pos. Still can't get my head around offsets dammit.
I know I need to write the 32k bin to the end of the eprom but am not sure where to start it.
Tried multi filling it from 0-7fff, 8000-10000, 10000-18000 etc but no luck.
What am I doing wrong?
I know I need to write the 32k bin to the end of the eprom but am not sure where to start it.
Tried multi filling it from 0-7fff, 8000-10000, 10000-18000 etc but no luck.
What am I doing wrong?
- delcowizzid
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Re: Hot rodding a 27C128 dinosaur
a 27c256 will take only one 12p bin just program from 0000 onwards LOL
If Its Got Gas Or Ass Count Me In.if it cant be fixed with a hammer you have an electrical problem
- delcowizzid
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Re: Hot rodding a 27C128 dinosaur
by didnt work you mean the car wont run on it or it wont program
If Its Got Gas Or Ass Count Me In.if it cant be fixed with a hammer you have an electrical problem
- krusty
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Re: Hot rodding a 27C128 dinosaur
Won't program. That's why I was clutching at straws loldelcowizzid wrote:by didnt work you mean the car wont run on it or it wont program
It's a brand new EEPROM too.
- delcowizzid
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Re: Hot rodding a 27C128 dinosaur
did you erase it for 5-6 minutes in the uv eraiser
If Its Got Gas Or Ass Count Me In.if it cant be fixed with a hammer you have an electrical problem