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=RB30ET= [[image:Vlt-dev-ecu2.jpg|thumb|VLT ECU]][[image:Vlt-dev-ecu3.jpg|thumb|VLT ECU]] [[image:Vlt-dev-ecu.jpg|VLT ECU]] *Commodore VL Turbo Development ECU *[[Nissan]] Motor Company (NMC) Part # 23710-35252 (7) *Japan Electronic Control Systems (JECS) Part # B18 000 653 (4869) Knock sensor 6.94KHz ;Main board JECS A19-001 611 :40 Pin CPU HD6802 (Motorola 6802 Clone) :42 pin IO HD46510P (46510 Interface chip) :24 pin NEC D449C(A)-1 (2K RAM chip) :28 pin socket connecting to daughterboard (Program contained on four separate EPROMs) :Large custom JECS chip A10-248 002 replaced with Fujitsu MB113T111 (8429 - K13) This ECU uses spare socket with MB7132E chip which contains a 1K PROM chip ;Daughterboard JECS B19-051 529 :Contains 4 EPROMS 8x8k :Knock sensor circutry (as in the Z31 ECU) :30 pin M59203P - Mitsubishi chip for knock sensing :16 pin TDS2501P - Toshiba chip :8 pin - NEC - C125 chip ---- '''Notes''' *[[Nissan]] ECU Numbering *23710 - Part type (ECU) *__X - First Nissan model *__ - Specifcs to the part number The HD46510P in the Hitachi/JECS ECUs was superceded by the HD63140CP chip in the [[R32]] ECU.We know that this is a universal pulse processor chip and contains Data direction, port data, watch dog timer, A/D data register, I/O assignment register, Interupt enable register 1024 byte SRAM. The code must interact with the registers on this chip to perform A/D and timing operations. The A19 JECS chip is also seen labeled as Fujistu custom number chips which are suspected to complement or perform similar function Knock sensing in all boards for import vehicles (Hitachi) appear to consist of the same components. The knock must be tuned to the correct frequencies of the engine to function properly
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