Stuart Posted May 23, 2012 Share Posted May 23, 2012 Does anyone have, or know anything about, TMS9900 chips with the additional marking "MP9514". It will probably be a ceramic chip with a gold top. I've been contacted by a chap who's after one to repair some equipment. Apparently it's not interchangeable with the standard TMS9900 chip (although its still 64-pin, 0.6" wide). I seem to recall that the MP number relates to a mask number so its probably different internally somehow. Stuart. Quote Link to comment Share on other sites More sharing options...
matthew180 Posted May 23, 2012 Share Posted May 23, 2012 If Google does not turn up something, good luck finding any "offline" info. Someone would have to have the old datasheet or something. I have to imagine sourcing one will be even harder. If the differences were known, it might be possible to modify a standard 9900 to work? Quote Link to comment Share on other sites More sharing options...
+FarmerPotato Posted October 4 Share Posted October 4 Found it! (12 years?) The MP9514 is the Logic Processor in TI's PM550 PLC (Programmable Logic Controller). It is mentioned as one of two 16-bit processors, in the Program Master 550 Intelligent Programmable Control System Programming Manual. MP9514 The MP9514 Logic Processor continuously scans all steps of a Relay Ladder Logic (RLL) program in non-volatile RAM. Separately, the TMS9900 Controller runs an Executive OS which handles functions such as PID loops and math. The MP9514 and TMS9900 share a common memory bus. The MP9514 interrupts the TMS9900 when it reaches a Step that represents a subroutine call. The Executive queues the request. When the request is completed, the Executive updates a memory location. The MP9514 sees it on its next scan. @Stuart, @matthew180 I'm excited to learn that both processors are TMS9900. Texas Instruments PLCs I've been writing about these on our sub-forum. Your post here, Stuart, was the only Google result for MP9514! TI-PM-550-programming-manual.pdf 5 Quote Link to comment Share on other sites More sharing options...
Stuart Posted October 4 Author Share Posted October 4 Good job I wasn't holding my breath! 3 Quote Link to comment Share on other sites More sharing options...
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