The following information is provided as is, and the authors take no responsibility for the correctness.

This is used by the Lexmark c500n.

SLX printers are raster printers which happen to use a very efficient wire protocol which was developed by Zenographics and cloned by Software Imaging K.K.

$ foo2slx-wrapper testpage.ps | slxdecode
SLX_MAGIC, 0x584c53a5 (SLX)
SLT_START_DOC, 12 items
        SLI_PAGECOUNT, 4294967295 (0xffffffff)
        SLI_DMDUPLEX, 0 (0x0)
        SLI_DMCOLLATE, 0 (0x0)
        SLI_0x3, 0 (0x0)
        SLI_DISPLAY, 0 (0x0)
        SLI_0x5, 0 (0x0)
        SLI_0x6, 0 (0x0)
        SLI_0x7, 1 (0x1)
        SLI_0x8, 0 (0x0)
        SLI_0x9, 0 (0x0)
        SLI_COUNT, 1 (0x1)
        SLI_DMCOLLATE, 0 (0x0)
SLT_START_PAGE, 16 items [Page 1]
        SLI_DMPAPER, 6 (0x6)
        SLI_CUSTOM_X, 0 (0x0)
        SLI_CUSTOM_Y, 0 (0x0)
        SLI_DMCOPIES, 1 (0x1)
        SLI_DMDEFAULTSOURCE, 0 (0x0)
        SLI_DMMEDIATYPE, 0 (0x0)
        SLI_NBIE, 0 (0x0)
        SLI_RESOLUTION_X, 600 (0x258)
        SLI_RESOLUTION_Y, 600 (0x258)
        SLI_OFFSET_X, 102 (0x66)
        SLI_OFFSET_Y, 102 (0x66)
        SLI_RASTER_X, 4896 (0x1320)
        SLI_RASTER_Y, 6392 (0x18f8)
        SLI_0x10d, 4896 (0x1320)
        SLI_0x10e, 6392 (0x18f8)
        SLI_0x10f, 1 (0x1)
SLT_JBIG_BIH, 0 items [black]
        Data: 20 bytes
                DL = 0, D = 0, P = 1, - = 0, XY = 4896 x 6392
                L0 = 128, MX = 0, MY = 0
                Order   = 0
                Options = 8  TPBON
                50 stripes, 0 layers, 1 planes
SLT_JBIG_BID, 0 items
        Data: 86428 bytes
SLT_END_JBIG, 0 items
SLT_END_PAGE, 0 items
SLT_END_DOC, 0 items
Total size: 86448 bytes

http://foo2slx.rkkda.com