Hi, I have finally made an adapter to read the 2564 ROM from my Microwriter on my EPROM programmer (which can only read the 2764). There were about 5 pins to rewire, I'll write some notes later on the differences. I've upload the ROM image to: http://www.vintagecomputers.btinternet.co.uk/mw4/mw4.zip The file looks OK, but there are a lot of FF bytes on the ROM, which hopefully implies that the whole 8K bytes weren't needed rather than the ROM is faulty. Hopefully Tony can compare this with his ROM and come back with any further tips or questions. If anyone else has a fully working MW4 please make contact. I haven't tried to disassemble the ROM yet (thanks Phil for the link to DASMx), maybe one day. Regards, John ================================================================== John S john_a_s2004 at hotmail.com Wed Sep 8 15:40:20 CDT 2010 Tony wrote: My one can generate all the letters, numbers and punctuation marks so fingers crossed the EPROM is OK. OK, I'll try and read the EPROM. This might take me some time, but I am keen to do it as there is very little technical stuff about the MW4 on line. I might try and disassemble the code too (but I don't think IDA has a 1802 option!) Regards, John