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hmm.... if there isn't a flag, then assuming there is a decent hack available of a mask(any mask really) with one in it, i could port the code... i imagine you're refering to the cable-driven speedometer that has a little optical generator/sensor connected to it for the ECM to determine vehicle speed, usually called the VSS buffer? i do know the 7730 C1 pin is actually a 2K PPM output, but i haven't played with the inputs as much... any reason you prefer to run a cable-driven setup, Dave?
or actually, any other application that used a 7730/7727 with a 2K PPM optical signal, whatever has the most documented code should work the best. would it be possible to hook that signal up to the normal VSS high line and program the road speed constant to 2000 PPM and set the I/P divider to 1?
also, for anybody running the single-fire stuff, ever feel a "bump" when getting near the BPW limit for single-fire? it seems that GM never implimented a check to see if the previous engine cycle was a fire or no-fire cycle, so when entering into double-fire, there is a 50% chance of getting a large single-fire pulse of fuel one revolution, then the next rev enters into double fire and instead of a cycle of air, there is a shot from double-fire as well, stumbles the hell out of a LH0 when throttle is open pretty far with the TCC locked... and when entering back into single-fire, the stock settings only deliver a 62.5% BPW value...
i have a testing version in the car right now, should have results in a few hours or so and will post BINs then, since it can be quite a shock and is certainly worthy of an immediate release.
EDIT: took a closer look, it seems the internal VSS buffering is handled by the U10 chip in the 7730/7727 types, and when the magnetic signal is used, it can either block or combine with an optical input.... what this means is that even though it connects to a different pin on the connector, the only difference is the math involved, since now instead of converting a high PPM signal into a MPH value and then outputting that into a 4K PPM signal for the instrument cluster, now it just needs to convert a 2K PPM signal(or whatever number really, i think i can handle a pretty wide variety of values here depending on the pulse generator) into a MPH value for internal functions, no kind of outputting. granted, it will still output a value on the 4K PPM circuit, but it won't be correct, just need to keep that in mind for the optical setups.
this should please the fiero crowd as well, now that i think about it.... they all use cable-driven clusters/transaxles from the factory IIRC. no more need for a dakota digital buffer box or one of the later switch-type buffer boxes from the ~93-95 trucks(DRACs)
or actually, any other application that used a 7730/7727 with a 2K PPM optical signal, whatever has the most documented code should work the best. would it be possible to hook that signal up to the normal VSS high line and program the road speed constant to 2000 PPM and set the I/P divider to 1?
also, for anybody running the single-fire stuff, ever feel a "bump" when getting near the BPW limit for single-fire? it seems that GM never implimented a check to see if the previous engine cycle was a fire or no-fire cycle, so when entering into double-fire, there is a 50% chance of getting a large single-fire pulse of fuel one revolution, then the next rev enters into double fire and instead of a cycle of air, there is a shot from double-fire as well, stumbles the hell out of a LH0 when throttle is open pretty far with the TCC locked... and when entering back into single-fire, the stock settings only deliver a 62.5% BPW value...
i have a testing version in the car right now, should have results in a few hours or so and will post BINs then, since it can be quite a shock and is certainly worthy of an immediate release.
EDIT: took a closer look, it seems the internal VSS buffering is handled by the U10 chip in the 7730/7727 types, and when the magnetic signal is used, it can either block or combine with an optical input.... what this means is that even though it connects to a different pin on the connector, the only difference is the math involved, since now instead of converting a high PPM signal into a MPH value and then outputting that into a 4K PPM signal for the instrument cluster, now it just needs to convert a 2K PPM signal(or whatever number really, i think i can handle a pretty wide variety of values here depending on the pulse generator) into a MPH value for internal functions, no kind of outputting. granted, it will still output a value on the 4K PPM circuit, but it won't be correct, just need to keep that in mind for the optical setups.
this should please the fiero crowd as well, now that i think about it.... they all use cable-driven clusters/transaxles from the factory IIRC. no more need for a dakota digital buffer box or one of the later switch-type buffer boxes from the ~93-95 trucks(DRACs)
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