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#11 |
![]() Join Date: Jan 2024
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Any idea what type of processor these were these based on back in the day? I could try to lean on some of my professional contacts if I can give them a hint of what they're disassembling.
Last edited by scorp508; 05-09-2024 at 10:55 AM. |
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#12 |
Join Date: Aug 2005
Location: Fishers, IN
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Motorola 68HC11
if that's what you are asking.
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#13 |
Join Date: Aug 2005
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Many many years ago I made a complete, fully commented disassembly of BFXB, and BMCB. Had the others partially complete but moved on to other things. Had full access to the source code to add, delete, routines and reassemble. It worked, I added closed loop lambda control at one point. I had a lot more free time in my 30s I guess... LOL
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#14 | |
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1987: Z51 Coupe, Z51, 4+3, Yellow / Graphite 1994: ZR-1 #150, Admiral Blue / Black 2015: Z06 Coupe, Z07, M7, Arctic White / Red |
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#15 |
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For what it's worth it has been recommended I give Ghidra (https://ghidra-sre.org/) a try for disassembly. The NSA created it.... so who knows what else it'll install on my machine.
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1987: Z51 Coupe, Z51, 4+3, Yellow / Graphite 1994: ZR-1 #150, Admiral Blue / Black 2015: Z06 Coupe, Z07, M7, Arctic White / Red |
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#16 |
Join Date: Aug 2005
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I found an old presentation I did at the Gathering in 2004. Attached.
https://toddpepmeier.wixsite.com/pep...-presentations
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#17 |
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If I remember, the "ANHT" hac was more closely related to the LT5 code at the time. It almost seemed like the various operating code sections were pulled from a menu and inserted into whatever calibration they needed to create at the time. All the LT5 calibrations are similar, but you can tell over time where they added some tweaks and minor functionality here and there. The BMCB version strikes me as the most advanced. Makes sense since it was among the final releases.
Here's a snippet of the BFXB code, which determines the target air-fuel ratio in open loop, and then applies the richest of the calculated ratios to determine the final ratio. Code:
****************************************************** ** OPEN LOOP/CLOSED LOOP FUEL/AIR RATIO CALCULATION ****************************************************** OLCLAIRF CLRA LDAB FATI TIMEOUT A/F RATIO ADDB KFABIAS OPEN LOOP F/A BIAS USED TO SET UP LEAN LIMIT ADCA #0 ADDB FATC COOL TEMP F/A RATIO OFFSET ADCA #0 PSHB PSHA BRSET MWFA1;BIT7,FAADDVAP 1=CLOSED LOOP MODE (BOTH SENSORS CL) ****************************************************** *** ADD MAP BASED TERM (VAPORIZATION FACTOR) IF IN OPEN LOOP ****************************************************** LDAA NMAPLD NORMALIZED MAP VALUE LDX #F50H OPEN LOOP FUEL/AIR % CHANGE V. MAP JSR P4LKUPQ 2D TABLE LOOKUP, NO OFFSET, SPACED 16 STAA FAVAPF FUEL/AIR VAPORIZATION FACTOR FAADDVAP PULA PULB ADDB FAVAPF FUEL/AIR VAPORIZATION FACTOR ADCA #0 ****************************************************** *** APPLY ALL FUEL/AIR MODIFICATION TERMS TO STOCHIOMETRIC ****************************************************** MULFAST LDX KFASTCN STOCHIOMETRIC A/F RATIO JSR P4M1616C 16X16 MULTIPLY RETURN W/ MIDDLE 2 BYTES STD FAVALNPE NON-PWR ENRICH F/A VALUE ****************************************************** ** PE FUEL-AIR RATIO CALCULATION ****************************************************** BRCLR MWFA;BIT5,PEAIRFLX 1=POWER ENRICHMENT ACTIVE LDX #F68E POWER ENRICH FUEL/AIR % CHG V. RPM LDAA NTRPMX RPM/25 CMPA #160 BHI PEAF001 SUBA #16 BCC PEAF002 CLRA BRA PEAF002 PEAF001 LDAA NTRPMZ RPM/31.25 ADDA #16 BCC *+4 LDAA #255 PEAF002 JSR P4LKUPQ 2D TABLE LOOKUP, NO OFFSET, SPACED 16 TAB LDX #128 ABX LDAB LKUPF67 F67 LOOKUP IN 100 MSEC COOLVAR ABX LDD KFASTCN STOCHIOMETRIC A/F RATIO JSR P4M1616C 16X16 MULTIPLY RETURN W/ MIDDLE 2 BYTES STD FAVALPE PWR ENRICH F/A VALUE PEAIRFLX EQU * ****************************************************** * RICHEST FUEL/AIR RATIO (P.E. OR NON-P.E.) DETERMINATION LOGIC ****************************************************** FAVALUPD LDX FAVALPE PWR ENRICH F/A VALUE CPX FAVALNPE NON-PWR ENRICH F/A VALUE BHI *+5 LDX FAVALNPE NON-PWR ENRICH F/A VALUE LCB36 STX FAVAL FINAL TOTAL F/A VALUE
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#18 | |
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#19 |
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Interesting stuff going on in those old ECUs. More complicated than I realized.
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