Rom Maps#

An area to collaborate on all the memory addresses found in ROMs - Rom Maps - OBD1 Civic and Integra ECUs - Memory Locations - Programming Resources - Other OBD1 - Memory Locations - OBD0 VTEC ECUs - Memory Locations - OBD0 Multi-Point Fuel-Injected - Memory Locations - Programming Resources - External Resources

OBD1 Civic and Integra ECUs#

OBD1 Civic Integra ECUs share a lot of features#### Memory Locations

• P28 - ROMs based on the USDM 304 P28 (92-95 Civic D16Z6 SOHC VTEC)
• P30 - ROMs based on the JDM 203 P30 (Civic B16A DOHC VTEC)
• P72 - ROMs based on the USDM 273 P72 (Integra B18C1-3 DOHC VTEC)
• Uber P72 - ROMs based on Blakes Uber Data ERM code
• Hi Res P72 - ROMs based on John Cui's custom high resolution P72 code

Programming Resources#

• ASM662 - can be used to assemble and disassemble these ROMs.
• OBD1 Conversion Formulae - can be used to convert values found in these ROMs to real-world values.
• OBD1 Code Compatibility - describes the various ways you can run code in an ECU other than what was intended.
• Some 66k Assembler Routines - have been commented, and you can look at the commented OBD1 Civ Teg Routines.
• Auto Or Manual - There is an interaction between hardware and software to determine transmission behavior.

Other OBD1#

Everything else OBD1 - usually 66207 based MCUs#### Memory Locations

• P13 - The JDM/USDM H22 (92-95 Prelude DOHC VTEC).

OBD0 VTEC ECUs#

OBD0 VTEC ECUs ECUs share a lot of features#### Memory Locations

• PW0 - ROMs based on the PW0 JDM (89-91 CRX/Civic EF8/9 B16A) but also included is some of the Euro PW0 locations.
• PR3 - ROMs based on the PR3 JDM (89-91 Integra XSi B16A)
• ASM662 - can be used to assemble and disassemble these ROMs.
• OBD0 VTEC Routines - have yet to be written.

OBD0 Multi-Point Fuel-Injected#

OBD0 MPFI ECUs share a lot of features#### Memory Locations

• 91 PM6 - ROMs based on the 91 PM6 (USDM CRX/Civic Si w/ SOHC D16A6)
• 91 PR4_PA - ROMs based on the USDM 90-91 PR4 with internal PA sensor
• 90 PR4_no_PA - ROMs based on the USDM 90-91 PR4 w/ external PA sensor
• 91 PM7 - Although very similar to the 91 PM6, George Ricketts and others have done a lot of development with the PM7

Programming Resources#

• OBD0 PM6 PM7 RAM_Locations - the PM6 and PM7 code seems to store important values in really similar RAM locations.
• OBD0 Conversion Formula - can be used to convert values found in these ROMs to real world values.
• OBD0 Code Compatibility - details what code can be swapped into which ECUs.
• OBD0 MPFIRoutines - are often shared between ECUs.
• Intel8051 - assembler/disassemblers can be used with these ROMs.

External Resources#

• A webpage with some of the ROM locations and formulas is here.