HP QMS 1660 - Manual (Page 116)

Memory
QMS 1660 Print System Reference 5-16
specify the largest media size you plan to use for each resolution.
Memory is then automatically allocated to the clients that require it.
» Note: The printer does not allow you to choose features that do not
work with the amount of memory currently installed.
Using the Frame Buffer option does not change the media size. It just
ensures that you have enough memory allocated to the appropriate
clients to print on the requested media size.
Menu Administration/Memory/Frame Buffer/300 dpi
Choices 12x19
Default 12x19
Menu Administration/Memory/Frame Buffer/600 dpi
Choices 11x17, 12x19, A3, A4, A5, B4, B5, B6, executive, full ledger,
legal, letter, postcard, and universal
Default 11x17
Menu Administration/Memory/Frame Buffer/1200 dpi
Choices 11x17, 12x19, A3, A4, A5, B4, B5, B6, executive, full ledger,
legal, letter, postcard, and universal
Default letter