1227747 TBI trucks generally from '87 to '91 /gmecm/papers/prog 101.html Programming 101 (focuses on GM 1227747 ECM) /gmecm/papers/tunetip.html Tuning ...

1227749 Info This is link to the '749 info on the GMECM web site. http://www.diy efi.org/gmecm/ecm info/1227749/ Ludis's '749 schematics. http://www.cruzers.com/~ludis ...

How to use the subroutine TODO create a table how to call it Explanation of the Code TODO AlexHarford 30 Jun 2006

Since people are getting interested in assembly, I thought I'd post up some topics on assembly basics. I'm not an assembly expert but I've done some assembly on different ...

Branching in the 68HC11 Branching controls the flow of a program. It allows you to take different paths depending on what is going on with the engine. Branches ...

Checksum calculation This example is based on the hac. The checksum routine is used in several places: to verify that the processor can read every location ...

Differences from stock 68HC11 This applies to the 1227730, 749: From: Ludis Langens Date: Mon, 15 Feb 1999 04:37:26 0800 Subject: GMP4 MPU information The architecture ...

Interrupts Interrupts are used, like the word says, to interrupt the processor from it's regular work to do something that is time critical. When interrupts happen ...

Memory Map A memory map is how the processor sees the world. When you design a system with a microcontroller, it uses address lines to control where it reads data ...

To start off with understanding how registers work, you need to know what happens at the electrical level. There are several types of 'memory', meaning it can store ...

Stacks The stack is used like a stack of trays in a cafeteria. The last one put on is the first one taken off. Here are some general tutorials on stacks in assembly ...

Subroutines A subroutine is a commonly used section of code that is used many times in a program. There is a list of common subroutines between the 8D hac and the ...

Corresponding Subroutines: 8D: 60: B204 C9C2 '''IRQ 1''' Is it similar? ???? CAA2 RX DAT TEG full EB93 CA14 TX Data reg empty (not the same, but ...

Converting an analog voltage like a MAP sensor reading to a binary number requires an analog to digital convertor. There are a bunch of analog lines that come into ...

Binary Math Number Types Multiplication and Division Never, ever do multiplication or division. Ok, you can sometimes, but you need to be careful ...

Chip Extender 28 pin Remote Chip Mounting Solution This device uses a 28 pin ribbon mounted dip header, 28 pin ribbon cable (18 24"), 34 pin IDC header, Phillips NC7SZ32M5X ...

ECM Proportional Control Robert Rauscher 7/9/2000 Copyright 2000, Robert Rauscher, All Rights Reserved. This is specific to the 747 ecm. However, the methods and madness ...

This is covered in PWM AlexHarford 30 Jun 2006

I've attached a calibration (2pt2 dis.bin) which I wonder if you'd be kind enough to forward to the list ftp site, along with a general post to the list. This calibration ...

ECM Test Bench This is a test bench I built a while ago for the GM 1227749. It has an ALDL connector, an AKM RS 232 converter, 2 injectors, an IAC, a Stim board ...

Information pertaining to specific ECMs 1227747 1227749 C3 information ALDL datastream formats P4 information /gmecm/ecm info/p4 registers ...

Ignition Control and the '747 ecm Robert Rauscher, 5/26/99, Updated 4/9/00 Areas preceded with a ' ' (vertical bar), are updated. The spk747al.bin file is also updated ...

TWikiGuest 28 Apr 2007 Prior to the advent of megasquirt I was a regular here on GM DIY, but I was frustrated with the need to burn eproms and when megasquirt came ...

I am trying to gain access to my gauge cluster in my 2006 Pontiac GTO so that i can edit/change my startup/shutdown displays and to turn on the factory shift light ...

GMECM FAQ here SteveRavet 30 Jun 2006

From Shannen Durphey converting between DIS and distributor From Robert Rauscher /gmecm/papers/747spark.txt 1227747 used for spark only /gmecm ...

GMECM related projects UsbVpw A USB to VPW (GM OBD2 protocol) converter that will allow scan tool functionality as well as reflashing. ChipExtender28 ...

This is a scratch area for uploading pictures and other files of a temporary nature. Since the list rejects attachments, this is the place to put those attachments ...

AbdulRauf 18 Nov 2006 Hi All, My Daewoo Racer 1.5i A/C compressor has gone bad and replaced with normal Denso A/C compressor (Original not available). The original ...

68HC11 Assembly Discussion 68HC11Addressing 68HC11Branching 68HC11Interrupts 68HC11MemoryMap 68HC11Registers ...

PID stands for proportional, integral, derivative. (For those of you that took calculus in school :) ) A PID controller uses feedback to try and keep a sensor reading ...

PWM stands for pulse width modulation. PWM is used by a processor to do two things: produce square wave with a certain frequency and duty cycle, and also provide a ...

Remote mounting solution for 28 pin DIP chips See ChipExtender28 CraigMoates 25 Dec 2006

TWikiGuest 03 Oct 2006 have been trying with 1227808 using 2 6cyl dis coils for v12 the only option was as previously mentioned ,run two ecu's reason is you ...

SPI stands for serial peripheral interface. Here is a description. This is used to offload some of the processing from the main processor to other chips on the circuit ...

The 16045148 is an interesting chip. It offloads a lot of processing from the main CPU. '''TODO''' Is it a GM specific chip or available from someone like TI??? ...

USBVPW An VPW to USB converter that will allow connecting any USB equipped PC to a GM OBD2 PCM This project is released under the GPL license. You can read it if ...

Virtual COM VPW Interface This project isn't designed to displace or compete with the UsbVpw but is instead intended to be an alternative and supplemental effort. ...

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Prior to the advent of megasquirt I was a regular here on GM DIY, but I was frustrated with the need to burn eproms and when megasquirt came out I jumped. I have recently ...