stupid_fast Posted July 2, 2018 Share Posted July 2, 2018 (edited) Edit for latest information; See posts further down for full details on modifying 1982/83 ECCS for re-mapping and live tuning. All information related to reproducing this project can be found on Github. https://github.com/eccs-reengineering/280ZX-Turbo-ECCS Datasheets and other files can also be found on my public google drive. https://drive.google.com/drive/folders/1mRNbCs317YusVA-wutB3DW7AYV1MVt2l?usp=sharing Original post; Thought someone here might get a kick out of this. I just dumped the ROM chips from my 1982 L28ET Manual & Automatic ECCS ECUs. The only data I was able to identify was the timing and fuel maps. The Ignition and Fueling map were identical between Auto and Manual ECUs. There were a few other bits of data that were different but I have not identified what they are. I've attached the .bin file to this post if anyone wants to have a look. 1982 Manual Transmission ECU A18-601-042 2603 1982 Automatic Transmission ECU A18-602-043 2111 Here's some information I've learned about each component while figuring out how to read the ROMs. The 1982 ECCS ECU; (note, 1982 and 1983 ECCS ECM's are interchangeable) Hitachi HD46802P Motorola 6802 CPU varient Motorola 6800 series was fairly common in the late 70's and 80s, disassembles are available although I have not had luck interpreting the code. 6800-series disassembler DASMx, http://myweb.tiscali.co.uk/pclare/DASMx/ Hitachi HD46506 ADU (Analog Data Acquisition Unit) I haven't been able to find any information about this chip other than what it is. 1K-byte 2708-type ROM 1024-word x 8-bits Hitachi HN25089 DIP-24 Contains ignition&fuel map data similar to the design of the dual-chip Z31 & R31 ECCS units, the data is redundant and also contained in the main 8K-byte chip. For more information, see 'The R31 Complication' at https://wiki.r31skylineclub.com/index.php/ECU_Chipping This 1K ROM can be removed, and the ECU will function with the single 8K ROM as long as the IC-3 HD47LS20P quad-NAND chip is moved from the daughter board to the main board. 8k-byte 2364-type ROM 8192-word x 8-bits Hitachi HN48364P DIP-24 Contains all microcode, fuel and ignition maps are on the last 1K of address space. I was able to rewire the 2364 ROM to read as a 2764-type ROM on a TL866 II+ programmer. The adapter diagrams were found on Commedore 64 forums, they also use a DIP-24 2364-type ROM. I have a 28C256 ROM functioning as a replacement with a C64 2364 adapter from Retro Innovations. Attached to this post you'll find two dumps of 8KB bin files from the Manual and Automatic 1982 ECCS ECU's, as well as some representations of the ignition and fueling maps in LiveEdit as well as RomScan utilities. 1982MT_S130_A18-601-042.BIN 1982AT_S130_A18-602-043.BIN Edited February 24, 2020 by stupid_fast Quote Link to comment Share on other sites More sharing options...
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