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EEC Hacking 

 

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 Post subject: EEC Hacking
Posted: Wed Oct 08, 2008 12:35 am 
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Ive decided to start a new thread in conjunction with Jason's (galapogos01) Tuning with Moates F3, however this one will be totally for the purpose of EEC editing, and not so much about the hardware side of things. Jason and I have written a couple of docco's that should give the average guy the info necessary to start tuning thier EEC.

So what are you waiting for???? GET TUNING PEOPLE!

 

 

Attachments:
EEC Definition creation - Part 2.pdf [706.37 KiB]
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EEC Definition creation - Part 1.pdf [1.37 MiB]
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Posted: Thu Oct 09, 2008 4:32 pm 
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*subscribes to thread*

Is this just for tuning? Not much of EEC hacking without atleast posting some disassemblers, discussing the processors/architecture, eec hardware, software?

That and I have nothing to add on the tuning side of things :(

 

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Posted: Fri Oct 10, 2008 12:07 am 
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feel free to talk disassembly, although there hasnt been much in the way of discussion yet :lol:

 

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Posted: Fri Oct 10, 2008 8:40 am 
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Disassembly. I don't even know where to start.

The 8065 differed from the 8069 in a couple of ways, one of which was additional instructions, registers, i/os, etc... One of the instructions that was added was the RETI instruction (as opposed to the bog normal RET instruction, which was also included).

Anyone on here know the exact operation of the RETI instruction on the 8065?

 

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Posted: Fri Oct 10, 2008 8:58 am 
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Subscribes to get an understanding of whats happening. I may just need some of this.. don't expect any input from me though.

 

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Posted: Fri Oct 10, 2008 10:37 am 
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I came across this accidentally. The site has no context for it though... http://www.pcmx.net/disasm/EEC_PE.asm Anyone struck Kevin Timmerman before?

 

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To be updated... soon!

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Posted: Fri Oct 10, 2008 10:38 am 
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Nice find!

That's awesome.

 

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Posted: Fri Oct 10, 2008 10:41 am 
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Ah - it was by Kevin Timmerman. Would've spent a while on that!

I knew the name rung a bell.

If you don't know the guy - he was responsible for the PCM explorer - check:

http://www.austincc.edu/cloud/tc_eec.htm
&
http://www.pcmx.net/pcmx/

 

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Posted: Fri Oct 10, 2008 4:08 pm 
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BTW I found that looking for an answer to
justfordima wrote:
Anyone on here know the exact operation of the RETI instruction on the 8065?

I checked eectch98.pdf first, noted that it's RETI on the 8061 but RETEI on the 8065. Then I just Googled RETI 8061. I usually get s**t when I try something as simple as that, but this was the 3rd result returned.

So anyway RETI is used about half a dozen times... the comments suggest it's something to do with interrupts... RETturn on Interrupt perhaps? Maybe the 8065 RETEI cound be RETurn on External Interrupt?

I'm starting from a very low base as far as ASM goes, I studied some Motorola 68K assembler nearly 20 years ago but never touched it since.

 

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To be updated... soon!

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Posted: Fri Oct 10, 2008 4:14 pm 
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8065 RETEI would be the return from interrupt, but it's an extended instruction. So RETEI. 8061 didn't have an extended instruction for returning from an interrupt.

I was more after how it works in comparison to the normal RET (which returns from a subroutine).

Good point with the searching hehe - I'm just too lazy.

And as far as the Motorola 68K assembler goes - that was quite an impressive processor for it's time, and alot of the logic can be applied to the 8065 (apart from the high speed i/o, and custom registers, and locations).

Did you do any ASM for the Z80? Just curious, cos that seemed to be the natural progression from the 68K.



Cheers

 

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Posted: Fri Oct 10, 2008 4:21 pm 
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Nah, I had an unnatural career progression in 1992 and ended up doing network admin and user support stuff alongside accounting. I was interested in finding out about 80x86 assembler for a while but time never permitted. I have an almost unopened "Zen of Assembly Language" put away somewhere safe...

 

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AU1.5 Wagon, Raptor ProStreet kit, Pacemaker 4499's with 3" collector, 3" metal cat, 3" pipe, Pex BSO660 & BSO439, BA brakes, Sprintgas mixer LPG system, Airod variable-venturi mixer... stealth FTW Sniper tuned!

To be updated... soon!

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Posted: Fri Oct 10, 2008 4:22 pm 
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Good stuff!

Are you writing chips for the EEC? What car have you got?

EDIT - just read your signature... that would've helped.

Are you modding the EEC in the AU?

 

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Posted: Fri Oct 10, 2008 5:28 pm 
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Not quite up to modding the EEC yet. I'm on a personal quest to fit a 2 bar MAP to the AU. It's theoretically possible given that the AU TMAP is an analogue 0-5v device. But I've been told by people who know the SCT and Sniper software that the MAP transfer function can't be rescaled. I thought the Moates hardware looked to have some potential to make this possible. It's just going to take a bit of work :-). So be it, if I help others along the way, that's a bonus.

 

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AU1.5 Wagon, Raptor ProStreet kit, Pacemaker 4499's with 3" collector, 3" metal cat, 3" pipe, Pex BSO660 & BSO439, BA brakes, Sprintgas mixer LPG system, Airod variable-venturi mixer... stealth FTW Sniper tuned!

To be updated... soon!

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Posted: Sat Oct 11, 2008 11:14 am 
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Return from Interupt is different on all ECU's. When the ECU gets an interupt, it drops everything on the stack, and then goes off and performs your interupt routine (I can think of a few in the EEC - Smartlock, Auto Trans Control, Ignition Timing, Fueling etc)

RETI is different from Ret in that it automatically picks up the registers etc from the stack, and continues on processing from where the main code was "at" (as long as youve been good with your stack processing).

RET just returns from your routine, without correcting the registers etc.

Now... thats just normal ECU theory. I have no practical skills on EEC at the moment.
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Posted: Sun Oct 12, 2008 12:46 am 
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Nigel, your input has been appreciated, as anything to do with the decoding of the EEC is helpfull. Finding parameters is low level stuff, but disassembly is what we really need to achieve, then the EEC with its enormous amounts of HSI/HSO could be made to run anything you like

 

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