The original Palm Pilot went on sale in March 1996 and sported 128kb of RAM, a 16Mhz Motorola MC68328 processor, and a tiny 160x160 monochrome display. Such a low-res display necessitated a small bitmap font and the 16MHz CPU meant they could easily take advantage of proportional rendering to squeeze even more on-screen.
The crispy clean font they came up with remained unchanged through many years of Palm success across many devices until the platform moved to Windows CE.
I recreated the font using BASIN and it is almost identical except for a few tweaks to the descenders. Both the normal weight and the bold weight have been transposed but to get best advantage out of this font you should use a proportional renderer like the Palm did.