[Diy_efi] Lucas Digital-P

[bcroe at juno.com]

You won't be programing a 27C64 via a serial link.  
You need to erase it under a UV light, then rewrite it.

Its oganized 8K by 8, any emulator with that range 
ought to be adaptable to the job.  

Bruce Roe

9 Jul 03 joe bialy <joedella at yahoo.com> writes:
> My V-12 Jaguar has a Lucas 16CU Digital-P ECU. It is a NEC uPD78C10
> processor with a 27C64 memory chip and a NEC 7004(whatever that is-
> A/D?) tied into it. That processor has no internal ROM, so the 27C64
> has all of the program as well as the maps stored on it. Other than
> lacking idle control, it works very well with this motor.
> 
> The Lucas ECU does a very nice job of runing the car but it would be
> nice to be able to tweak it when other mods are made to the car, 
> like
> larger TB's or exhaust or whatever. Rather than replacing the entire
> ECU with a megasquirt or somesuch and recreating all of its I/O, I
> would like to experiment with remapping the 27C64.
>  
> Can the three pin serial port (Txd, Rxd, SCK) on the 78C10 
> be used to
> perform this, and if so, does anyone know how to talk to it?
> 
> I poked around gmecm last night looking for an eprom 
> emulator to pop in place of the 27C64 but did not find 
> anything concrete. Has anyone ever come up with a DIY
> eprom emulator or an eprom reader/programmer? It
> would be neat to monitor and reprogram on the fly.
> 
> Joe

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