Rom
`27SF256`
This is supposed to be an electricallyerasable replacement for 27 C256. SST Datasheet (PDF) These can be purchased dirt...
`74HC373`
The 74HC373 is an octal Latch chip. It Latches 8 bits of data, and is usally used when adding an external rom to a MCU
5128XRAM
5128 XRAM explanation : The 5128 chip present in OBD0 ECUs is a 2K byte(?) SRAM chip. It is mapped into memory space at...
515X High Side Switch
Honda uses a 5 pin high side switch in a lot of their OBD1 and OBD2 ECUs to control solenoids like auto trans and VTEC s...
66k Resources
Documentation 66k Assembler Docs factory documentation on the Oki 66xxx processors used in most OBD1 and OBD2 implemenat...
91PM7 Target Idle
Author: HRED Date: 010303 17:27 You can alter idle target : search "09c4" value you find for example in PM7FOR6121502.
Adding 1-Wire VTEC Control to OBD0 ECUs (PM6)
Hardware modification guide to adding 1-wire VTEC control to OBD0 Honda ECUs by populating unused automatic transmission...
Adding Pages
This wiki is not actually editable. It is maintained by Sanimalp for Reference Only. He can be contacted via PM on Honda...
Bin File
A "bin" file is a binary file. It is a file filled with 8bit binary data.
Blue Loctite
Blue LocTite is like a girlfriend... your stuck with her, but you can get rid of her if you want to. Unlike Red Loctite.
Boost
"Boost" refers to when the pressure inside an engine's intake manifold is greater than Atmospheric Pressure.
Boost Controller
A boost controller is a device that allows the levels of boost generated by a turbo to be controlled.
Boost Cut
Boost Cut refers to a Fuel Cut or Spark Cut that is triggered to prevent the motor from damage from too much Boost.
check8 Checksum Utility
An 8-bit ROM checksum verification utility by Keil.
Chipping 1988-1989 OBD0 ECUs
Archived socketing and chipping methods for early 1988-1989 Honda and Acura OBD0 ECUs.
Chipping OBD2 Honda ECUs (OKI `66507` / `66P507`)
Hardware guide for chipping OBD2 Honda ECUs by replacing the OKI 66507 processor with a programmed 66P507 OTP microcontr...
Chipping the JDM OBD1 P30 ECU
Hardware modification guide for socketing, chipping, and converting JDM square-case OBD1 P30 ECUs to manual transmission...
Chipping the OBD0 PM6 ECU (1988–1991 Civic/CRX Si)
Step-by-step hardware guide to chipping the OBD0 PM6 ECU (1988–1991 Civic/CRX Si) to accept external EPROMs and custom t...
Chipping With Pictures
Visual guides for chipping OBD0 and OBD1 Honda ECUs, including PM6, big-case, small-case, and 1988-1989 ECU variants.
Clamping Diode
This is a diode to prevent a spike from an engine component (ike a solenoid) from damaging circuitry.
Column Multiplier
The column multiplier is a number used in a formula for calculating one column of the fuel map. This multiplier is found...
Crome JavaScript scripting API
Reference for the legacy Crome ROM editor JavaScript API used by scripts, ROM handlers, and plug-ins.
Crome ROM Editor
Crome is ROMEditor that John Cui wrote. Its main feature that differentiates itself from other ROMEditors is that it sup...
Crome ROM Tuning FAQ
Frequently asked questions about Crome, a popular ROM editing and tuning software for OBD1 Honda ECUs.
DAC
Digital to Analog Converter. the process of taking a digital value and converting it to an analog signal of some variety...
Dec At Addy
Dec At Addy is the decimal equivalent of the hex value at the specified address or location. So if the address was 1094h...
Disable VTEC VSS Check P28
Author: Gimpy Accord Date: 081403 03:42 1286 C5 22 19 : SB 22.1 1289 C5 F3 C0 32 : CMPB F3, 32 128D CA 1B : JLT 12AA 128...
DIY Easy-RTP v1.0 build and installation guide
Archived assembly guide and partial OBD0/OBD1 installation notes for the DIY Easy-RTP v1.0 board.
Dual Maps
see Dual Roms
Dual Runner Manifold
A dual runner manifold like on the F22/B18C1/H22A has two passages for air to flow. When in a low rpm range the long run...
Dual Tables
Dual tables simply refers to there being two sets of fuel/timing information in a single ROM. VTEC is an example of this...
EA
EA (EA Prime) is a pin on the MCU that controls whether the MCU runs off Internal ROM or an external ROM chip.
Easy-RTP v1.0 OBD1 installation
Preliminary archived installation procedure for connecting Easy-RTP v1.0 to OBD1 ECUs.
ECU Boost Controller
The Boost Controller feature is a DEVELOPMENTAL feature where the ECU controls boost by sending a PWM signal to a bleed...
ECU Nitrous Control
ppl are working on a ROM where the ECU activates the nitrous solenoid instead of the usual WOT switch.
Edit Text
All pages (except search results) have an Edit Text link at the bottom. You can edit the page you are reading by clickin...
Electronic Boost Controller
An Electronic Boost Controller is an electronic device usually composed of a solenoid on one of the wastegate lines and...
Electronic Part Supplier
a handful of major electronic part suppliers: Digikey good instock availability, great catalog, good website.
Engine Sim
Research an engine simulator that mimics a running engine for Honda ECU development and bench testing.
EPROM
Learn which EPROM types are pin-compatible with common OBD0 and OBD1 Honda ECUs and ROM burners.
FLASH
FLASHROM is very much like EEPROM except that it is erased / written in sectors
Fuel Cut
A Fuel Cut is when fuel to the motor is shut off completely. This is usually done as part of a Rev Limiter, Launch Contr...
Fuel Pressure
You can increase the amount of fuel delivered by increasing your static Fuel Pressure. High Fuel Pressure may however sl...
Full Recent Changes
Here's a list of all recently changed pages on this wiki, not just the most recent ones found in Recent Changes.
Ghetto Dyne
see http://web.archive.org/web/20110128180504/http://ghettodyne.com/ for more info. Turbo Edit can do everything Ghetto...
Good Style
"Young writers often suppose that style is a garnish for the meat of prose, a sauce by which a dull dish is made palatab...
Guide to Honda ECU Hardware Modifications
An index of hardware modifications for Honda OBD0 and OBD1 ECUs, including VTEC conversions, IAB additions, wideband inp...
Hex2 Bin
You can convert Hex Files to Bin Files using hex2bin (also available as an attachment to this page) Attachment: Modify:...
High-Resolution (Hi-Res) P72 ROM Specifications
Technical reference and memory map offset guide for the John Cui High-Resolution (Hi-Res) P72 custom ROM modification.
How to Install the "Add Extra Features" Plugin in Crome
Software guide for downloading, installing, and applying the Add Extra Features plugin in the Crome OBD1 ROM editor to e...
Ideal Gas Law
the Ideal Gas Law is an equation you may or may not remember from high school chemistry. PV = nRT P = Pressure (must be...
Intel8051
for all you could want to know and a great tutorial, go to http://www.8052.comAny 8051 assembler will work fine for codi...
Inter Wiki
This wiki supports Inter Wiki links in a style copied from Use Mod: wiki. Links to pages in other wikis can be made with...
Internal ROM
Internal ROM is memory stored inside the MCU
Introduction To ECU Chipping
A practical introduction to socketing and chipping OBD0/OBD1 Honda ECUs.
Introduction to TurboEdit (OBD0 Honda Tuning)
An introduction to TurboEdit, the free open-source ROM editing and tuning software for OBD0 Honda ECUs (PM6/PM7 codebase...
Java Script
Java Script is a scripting language commonly used on the world wide web. It is also used to write scripts to control Cro...
Latch
to latch something is to hold or preserve its state latches, like the 74 HC373 are logic gates that hold the state of IO...
Launch Control
Launch control refers to a "twostep" revlimiter. The way this works operationally is fairly simple there is a lower Rev...
Map Sensor Equation
Modeling the Map Sensor voltage output into a usable number. (From the Helm Manual:) !hondastockmapvolt.