Epson 1500 - Manual (Page 113)

You assign the memory using a value from 0 to 9 for each
channel. The factory setting is S:0 P:1 O:0. For example: if you
have an ActionLaser 1500 and you are using PostScript in the S
channel, HP 3/P/Si in the P channel, and nothing in the O
channel, you might assign the proportion as S:3 P:1 O:0 because
PostScript requires approximately three times as much memory
as HP 3/P/Si.
After choosing INDIVIDUAL, press to move to the following
display:
Menu/submenu Available options
0.5M P:1 O:0 SET P: 0-9
S: 0-9 (ActionLaser 1500 only)
O: 0-9
The number on the left is the total number of megabytes
available (ActionLaser 1000 has 0.5M and the ActionLaser 1500
has 1.0M standard), and the number to the right of each
channel is the proportion of memory allocated to that channel.
Use the arrow buttons to assign a new value from 0 to 9 to one
or more channels.
After you finish the memory allocation, press . The display
shows the following:
Menu/submenu Available options
C A N INITIALIZE E X E (cancel) or (execute)
Press to save the settings and restart the printer or press to
cancel the settings.
Note:
You can also save the settings by pressing EXIT to exit Level 2 and
then initializing the printer as explained in Chapter 1.
SelecType 4-29