When dealing with the 1Mb EPROMs you have 2 distinct, yet different types: JEDEC (27c010, etc.) and non-JEDEC (27c301) types. If it fails 1/2 way through the write then you are using the wrong type. When dealing with 27C1000 and 27C1001 you may find yourself scratching your head as to which type it is. Consult the data sheets to see: The difference between the two is that address line A16 and one of the enable pins are swapped. Raymond Thanks for the information Raymond! I did get the 1/2 way through error when I tried to program them the first time. I have read through the document and it is way over my head on so many levels!:) The one thing that I have noticed several times in the document and in various other Google searches is the Vpp setting. I also see a programming voltage of 12.75V but my programmer is only 5V. I can only assume I don't understand what programming voltage is. I will continue to read through it but it's very confusing to an amateur like myself. I know I can have them programmed by several people here but sometimes getting it done on your own (with the help and advice of many KLOV'rs) feels like an accomplishment in some way. Willem EPROM Programmer PCB5.0M. Launch X431 IV Master Version 100% Original Auto Diagnostic tool Rp 18.500.000. AK500 Plus AK500+ Key Programmer with EIS SKC Calculator with lastest software For Mercedes Benz Rp 6.900.000; Autel MaxiDiag Elite MD802 For All System + DS model Rp 6.500.000. I will attach the datasheet for the EPROM's in question in case somebody is familiar with them. They are SGS-Thompson M27C1000's https://dl.dropboxusercontent.com/u/12273640/Pinout.png. Don't worry about programming voltages. The EPROM programmer generates the necessary voltages internally from the 5V supply. Can you post a pic of the EPROM you're trying to program? What software are you using? What device (exactly) are you selecting in the software? Thanks for the response! I am trying to replace the two on the left with the two on the right or just reprogram the ones on the right with the new data. I bought the two on the right because they were erased and for some reason I couldn't get the ones on the left to erase. I'm now learning that they may have been erased but my programmer showed them as not empty. I can't find a datasheet for the NEC D27C1000 (or NEC D27C1000D), so I'm not sure if it's the JEDEC (27C010-like) or non-JEDEC (27C301-like) pinout. However, the right two (ST parts) are non-JECEC (27C301-like) pinout devices. It looks like what you have selected in your programmer is the JEDEC (27C010-like) pinout, as it says '27C010/1000/1001'. Is 27C301 in the device list? One other observation, your originals (the ones on the left) are 150ns speed (the -15 suffix) and your replacement EPROMs (the STs on the right) are 200ns speed (the -20 suffix). Depending on the application, the 200ns ones may not be fast enough. They look like they were on a Sega board. You doing resurrection ROMs for a System 16 game? I can't find a datasheet for the NEC D27C1000 (or NEC D27C1000D), so I'm not sure if it's the JEDEC (27C010-like) or non-JEDEC (27C301-like) pinout. However, the right two (ST parts) are non-JECEC (27C301-like) pinout devices. It looks like what you have selected in your programmer is the JEDEC (27C010-like) pinout, as it says '27C010/1000/1001'. Is 27C301 in the device list? ![]() One other observation, your originals (the ones on the left) are 150ns speed (the -15 suffix) and your replacement EPROMs (the STs on the right) are 200ns speed (the -20 suffix). Depending on the application, the 200ns ones may not be fast enough. They look like they were on a Sega board. Download mac os for windows 7. You doing resurrection ROMs for a System 16 game? Hey Darren these are the only options I see in my programmer and yes I am trying to resurrect a System X Thunder Blade upright. I ordered the eproms from ebay so I'm probably I ordered the wrong ones. Hey guys, Before I destroy any more eproms in the process. Do you guys know if these are the proper ones for a Sega resurrection? I've ordered some new eproms that M27C1000-12FI. Will these be too fast now or is that not a thing, with only too slow being a problem? I don't see 27C301 option in any of the software I've tried. Is there an 27C301 equivalent that would work or will I need a different programmer?
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