HP42S Up and Down arrow symbols on 82240B

[tcab]

The HP42S uses arrow symbols for moving around a matrix

←
↑
↓
→

I'm wondering how the ↑ and ↓ characters manage to get printed on the HP 82240 printer, since those characters seem to be missing from the Roman 8 character set, or more specifically the Modified HP Roman-8 (1986), variant II (HP 82240A/B & HP-28C/S). Those characters should be printed when embedded in program listings, or I think, when the HP42S/Free42 is in trace mode...


Notice the left and right arrows in the middle of line five. But I cannot see the up and down arrows, so how are they printed?

I don't have a HP42S (though I do have a DM42 which runs Free42), and my 82240B has broken, so I can't investigate this further myself.