In message <7.0.0.16.2.20090813095645.04e84460@interlog.com>, Spehro Pefhany writes >Just to make it clear, these old things with house numbers are almost >always MASK PROGRAMMED, meaning that the original buyer had to ante up >a mask charge and order a minimum quantity with at least 3 digits (4-1/2 >from Japanese suppliers). Especially 4-bitters. I've never been clear on this, I understand that *some* chips can be supplied truly mask programmed but the majority I've played with, when I've managed to identify them, were just OTP devices in plastic or non windowed ceramic packages. Perhaps mask programming is a hangover from a *long* time ago? > >Even a small PIC should be able to handle this easily, add a regulator Why bother, what about one of the HV PICS? 16HV616 or 16HV785 perhaps.. >and if necessary clock on a little daughterboard. Suggest you not underprice >it in relation to alternatives so it is worth your while. > A useful skill is the ability to avoid the feeling of guilt caused by charging a realistic price. -- Clint Sharp -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist