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Re: A1C XDF Additions
Posted: 2024 May 22, 20:26
by efloth
Awesome, thanks! This looks great. Curious if you know if there's any KAM addresses that I could store a calculated stoich afr value in. If that's simple enough, it'd be cool to have flex fuel control vs manually updating it
Re: A1C XDF Additions
Posted: 2024 May 22, 20:53
by decipha
dont know of any off the top of my head
Re: A1C XDF Additions
Posted: 2024 May 23, 06:32
by jsa
IIRC the EEC hardware manual gives address ranges that are KAM, that's not to say there's a spare in the range.
Re: A1C XDF Additions
Posted: 2024 May 23, 11:46
by wwhite
There is a KAM checksum algorithm that happens, be aware KAM may be reset to defaults if it detects an error.
Adding to KAM may not be that simple.
Re: A1C XDF Additions
Posted: 2024 May 23, 12:00
by wwhite
I think kam is located at 0x7B7 up to 0x821 for a total of 106 entries. That is in the code, not the reference manual.
Re: A1C XDF Additions
Posted: 2024 May 24, 14:02
by jsa
Hardware Manual wrote:
^ Electronics Division PECE DepartmentINTRODUCTION TABLE 1-4. REFERENCE PUBLICATIONS
*Functional and Electrical Specification for a 128-Byte Custom Keep-Alive Read/Write Memory (KAM) ES-N7700010FBCADA
* Functional and Electrical Engineering Specification for a 2K-Byte Keep-Alive RAM with parallel I/O (RAM1/0) ES-N7500030FSCAGA
*Functional and Electrical Engineering Specification for a 2K-Byte Keep-Alive RAM with Serial and Parallel I/O (RAM/CART) ES-N7500120FSCAGA
...
MEMORY (on-board 81C61, 81C62, 81C65, & 81C66)
The 81061, 81062, 81065, and 81066 all have the same memory size and type, and memory addressing circuits. Memory on-board these devices consists of 2,048 bytes of read/write static RAM. This RAM was specifically designed to provide keep-alive storage for user data in battery powered systems. The RAM can store data while consuming less than 100 microamps of current under a wide input voltage operating range (+2.0 VDO to +5.5 VDO) when non-active. The 81065 and the 81066 provide a special keep-alive power input for their RAM.
106 bytes used of 128 leaves some possible spare for 128kb kam hardware.
Later chips apparently keep RAM alive as well according to the above snips.
Re: A1C XDF Additions
Posted: 2024 May 25, 00:32
by efloth
Great information. Thank you guys. Play around with reading/writing some values. Looks like like my qh is loosing kams each power off so I'll have to figure that out first.
Re: A1C XDF Additions
Posted: 2024 Jun 12, 15:28
by efloth
need some help confirming these are TV ramp timers for upshifts. I am specifically trying to locate:
TMTVRMP_12 = TV ramp time for 1-2 shift.
TMTVRMP_23 = TV ramp time for 2-3 shift.
TMTVRMP_34 = TV ramp time for 3-4 shift.
Code: Select all
84fa: 26,f4,01 timer 26, 1f4,
84fd: 26,f6,01 timer 26, 1f6,
8500: 22,f8,01 timer 22, 1f8,