Quote:
Originally Posted by SiriusHardware
My objection was to Tesla giving their device almost the same device number as the original National Semiconductor device thereby strongly suggesting (intentionally or otherwise) that their device is a direct electrical / electronic substitute for the DM (Nat Semi) device, but then not adopting the same programming regime.
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I think there was a Texas Instruments PROM with the number SN74S571. It would be compatible in read mode, but not for programming. I don't think Tesla have done anything 'wrong' here.
The manufacturer (and thus the prefix letters) ARE important when you are programming the device. Once programmed, the Nat Semi, Texas and Tesla chips all read the same way and could be used in the same application circuit.