The Atari STcharacter set is the character set of the Atari ST personal computer family including the Atari STE, TT and Falcon. It is based on code page 437, the original character set of the IBM PC, and like that set includes ASCII codes 32–126, extended codes for accented letters, and other symbols. It differs from code page 437 in using other dingbats at code points 0–31, in exchanging the box-drawing characters 176–223 for the Hebrew alphabet and other symbols, and exchanging code points 158, 236 and 254–255 with the symbols for sharp S, line integral, cubed and macron. The Atari ST family of computers contained this font stored in ROM in three sizes; as an 8×16 pixels-per-character font used in the high-resolution graphics modes, as an 8×8 pixels-per-character font used in the low- and medium-resolution graphics modes, and as a 6×6 pixels-per-character font used for icon labels in any graphics mode. All 256 codes were assigned a graphical character in ROM, including the codes from 0 to 31 that in ASCII were reserved for non-graphical control characters. Digital Research's Intel-based original GEM for IBM compatible PCs utilized the similar GEM character set. It has swapped ¢ and ø and has also swapped ¥ and Ø. It also has the currency sign at codepoint 158, “ at codepoint 169, ” at codepoint 170, ‹ at codepoint 171, › at codepoint 172, section sign at codepoint 184, double dagger at codepoint 185, „ at codepoint 192, horizontal ellipsis codepoint 193, per mille sign at codepoint 194, bullet at codepoint 195, en dash at codepoint 196, em dash at codepoint 197, degree sign at code point 198, the S with caron and various uppercase Latin accented letters at codepoints 199-216, sharp s at codepoint 217, various spaces at codepoints 218-223, bullet operator at codepoint 249, black square at codepoint 254, empty set at code point 255, GEM-specific characters at codepoints 5, 6, and 7, various black triangles at codepoints 12-17, ⧓ at codepoint 18, ▂ at codepoint 19, ¶ at codepoint 20, § at codepoint 21, ↕ at codepoint 22, ↨ at code point 23, and codepoints 24-31 match code page 437.
Character set
The following table shows the Atari ST character set. Each character is shown with a potential Unicode equivalent if available. Differences from code page 437 are shown boxed. Although the ROM provides a graphic for all 256 different possible 8-bit codes, some APIs will not print some of these code points, in particular the range 0–31 and the code at 127. Instead they will interpret them as control characters.
Alt codes
Utilizing the Alt Numpad input method, users can enter a character by holding down the Alt key and entering the three-digit decimal code point on the Numpad. This provides a way to enter special characters not provided directly on the keyboard.
Euro variants
The Atari ST character set long pre-dates the introduction of the euro currency and thus does not provide a code point for the euro sign. However, some software utilized code point 238 for this purpose. This code point is normally assigned to the mathematical element-of sign, and to the Greek lowercase epsilonin code page 437. Alternatively, the rarely used logical conjunction sign at code point 222 could be replaced by the euro sign.
