The following is a proposal half-width Katakana encoding for the DCPU-16, fitting into the system's limited 7-bit address space for characters. The characters replaced are mostly box-drawing characters and a few punctuation marks. The Latin alphabet remains intact.
Characters above 0x3E and below 0x7F are the same as the default font glyphs
0x00 A
0x01 I
0x02 U
0x03 E
0x04 O
0x05 KA
0x06 KI
0x07 KU
0x08 KE
0x09 KO
0x0A SA
0x0B SHI
0x0C SU
0x0D SE
0x0E SO
0x0F TA
0x10 CHI
0x11 TSU
0x12 TE
0x13 TO
0x14 NA
0x15 NI
0x16 NU
0x17 NE
0x18 NO
0x19 HA
0x1A HI
0x1B FU
0x1C HE
0x1D HO
0x1E MA
0x1F MI
0x20 MU
0x21 ME
0x22 MO
0x23 YA
0x24 SMALL YA
0x25 YU
0x26 SMALL YU
0x27 YO
0x28 SMALL YO
0x29 RA
0x2A RI
0x2B RU
0x2C RE
0x2D RO
0x2E WA
0x2F WI
0x30 WE
0x31 WO
0x32 DAKUTEN
0x33 HANDAKUTEN
0x34 DECIMAL 0
0x35 DECIMAL 1
0x36 DECIMAL 2
0x37 DECIMAL 3
0x38 DECIMAL 4
0x39 DECIMAL 5
0x3A DECIMAL 6
0x3B DECIMAL 7
0x3C DECIMAL 8
0x3D DECIMAL 9
0x3E EQUALS SIGN
0x7F YEN SIGN