Ordered 15 IV-6 VFD tubes for a next-gen retro calculator. Need a new display board, reuse old keyboard part and CPU.

See ​https://github.com/eshazen/retro-25/tree/master/notes/VFD-Display

Other observations. Looking at Japanese IV-6 breakout board and Eagle design from Osh Park, looks like 32 mil holes on a 0.3-0.34 diameter circle are good. Front-face is either between pins 8 and 9 or pin 9 depending on who you believe. Spacing is around 0.538 (13.7mm) (Japan). Data sheet says tubes are 13mm max diameter.

Driver options:

Chip	Package	No Req'd	Notes	Price
UDN2891A or UDN2892A	DIP	12+	Parallel 8 inputs	$3.95 (Jameco)
MAX6920	SOT	8	Serial interface 12 outputs	$4.82 (DigiKey)
HV518P	DIP40	3	32-output serial interface	$6.42 (DigiKey)
HV5812	DIP28	5	20-output serial interface	$2.42 (DigiKey)