UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - A Simple Programmer for TESLA "MH74S-" bipolar PROMs

SiriusHardware · 16th Nov 2019, 12:44 pm

I would advise you not to try to programme an SN... as though it were a DM.. based on what I said in post #18. The DM programming regime will fire 10.5V pulses at the data pins, when the SN device - which reportedly uses the same regime as the MH devcies - expects the programming current to be drawn out of (sunk from) the data pins. You may just end up damaging your SN.. device.

Given the information / code / circuit which circuitryboy posted in the thread earlier it should actually be possible to use his revised (MH specific) hardware in conjunction with a more generic controller like a PIC or Arduino to program the MH... SN...devices. I might have tried this already but I don't have any of the MH devices myself.

I'd be interested to hear whether circuitryboy ever got the chance to try out his Tesla-modified version of the SOC PROM burner code.

16th Nov 2019, 12:44 pm	#20
SiriusHardware Dekatron Join Date: Aug 2011 Location: Newcastle, Tyne and Wear, UK. Posts: 11,556	Re: A Simple Programmer for TESLA "MH74S-" bipolar PROMs I would advise you not to try to programme an SN... as though it were a DM.. based on what I said in post #18. The DM programming regime will fire 10.5V pulses at the data pins, when the SN device - which reportedly uses the same regime as the MH devcies - expects the programming current to be drawn out of (sunk from) the data pins. You may just end up damaging your SN.. device. Given the information / code / circuit which circuitryboy posted in the thread earlier it should actually be possible to use his revised (MH specific) hardware in conjunction with a more generic controller like a PIC or Arduino to program the MH... SN...devices. I might have tried this already but I don't have any of the MH devices myself. I'd be interested to hear whether circuitryboy ever got the chance to try out his Tesla-modified version of the SOC PROM burner code.