[Gimp-user] Monochrome 1-bit export?

[John Coppens <john jcoppens com>]

Hi guys.

I used to save images in 1-bit PCX format, as required by several label
(thermal transfer) printers. I can't find any way to do that anymore.

Export to PCX does not give any options, and exports 24bit color.

Even after changing the image format to indexed, and selecting 1-bit B/W,
export to PCX is still 

8-bit colour, 300 x 300 dpi, RLE compressed

Any way to accomplish 

 1-bit colour, 72 x 72 dpi, RLE compressed

John
Note that another accepted format is monochrome BMP, but this does not
seem to work either in GIMP. The only options offered are RGB.