https://forums.tomshardware.com/threads/trade-galaga-07xx-or-04xx-for-08xx-custom-chip.148558/
Trade: Galaga 07xx or 04xx for 08xx custom chip | Tom's Hardware Forum
Archived from groups: rec.games.video.arcade.collecting (More info?) Hi all. I need a 08xx IC for a Galaga board. I have 2 working 07xx and one 04xx if...