File this along with the advice about resignation letters to state nothing but
"I am writing to give notice of my resignation from <company> on <today's date>. According to the terms of my employment contract my final day will be <leaving date >. -- Sincerely, <name>"
The amazing thing about MAME is that it almost doesn't matter if there aren't new machines to emulate, because it so perfectly preserves the past. It really is almost perfected.
(OpenEmu and Retro Virtual Machine are also worth the time; the latter particularly if you have fond memories of the very underrated Amstrad CPC)