Microprocessor Services, Inc., 516-499-4461 advertises such a thing.
$500 or so (PL/M can be -80,-51 or -86). That's all I know.
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Gideon Yuval, yuval at taux01.nsc.com, +972-2-690992 (home) ,-52-522255(work)
Paper-mail: National Semiconductor, 6 Maskit St., Herzliyah, Israel
TWX: 33691, fax: +972-52-558322