Shenske - I need to get my writer working first to test my roms, I put the master system bios at the start of the sg-1000 games, it works on emulator just need to test it on carts, where did you get your eproms from? the 27C256 chip im using for sms, are $15NZD each locally at electronics stores, and bout $8 each from hong kong, need to find a cheap source, but then again need to make new sms pcbs

.........and cartridge cases........and clamshells.........lol too much work.
But buying eproms for that price isn't really worth trying to sell them on as repros, unless you can get all parts cheap enough.