Kickstart 3.1 v40.70 Mask ROMs

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Please note that I would prefer NOT to use a Willem as these are rather low cost and their reliability is sometimes questionnable.

Thank you.

Willem are not bad at all, I use older version of it (parallel port, iirc its 3.x).

what you should be worried is quality of second hand 27c400...  those EPROMs turn out to be some kind of analog devices. they have limited amount of write/erase cycles. and erasing for too long time can kill them.

http://wiki.xtronics.com/index.php/How_EPROMS_Work#Why_do_I_need_an_EPROM_eraser.2C_can.27t_I_leave_them_out_in_the_sun.3F