FOCAL character set

In computing FOCAL character set refers to a group of 8-bit single byte character sets introduced by Hewlett-Packard since 1979. It was used in several RPN calculators supporting the FOCAL programming language, like the HP-41C/CV/CX as well as the later HP-42S,[1][2] which was introduced in 1988[1][2] and produced up to 1995. As such, it is also used by SwissMicros' DM41/L, both introduced in 2015, and is implicitly supported by the DM42, introduced in 2017 (although the later calculator utilizes Free42, which is based on Unicode internally).

Character set

The character set is derived from ASCII, but with the control code range and some high bit characters replaced by various special characters.

FOCAL character set (HP-41C/CV/CX / HP 82143A)[3][4]
_0 _1 _2 _3 _4 _5 _6 _7 _8 _9 _A _B _C _D _E _F
0_
0		 ‾/♦
203E/2666		 ∝?
221D?		 x̅/ā
0078 0305/0101		 ←
2190		 α
03B1		 β
03B2		 Γ
0393		 ↓
2193		 Δ
0394		 σ
03C3		 ♦
2666		 λ
03BB		 µ/μ
00B5/03BC		 ∡/∠
2221/2220		 τ
03C4		 Φ
03A6
1_
16		 θ
03B8		 Ω
03A9		 &?
0026?		 Å
00C5		 å
00E5		 Ä
00C4		 ä
00E4		 Ö
00D6		 ö
00F6		 Ü
00DC		 ü
00FC		 Æ
00C6		 æ
00E6		 ≠
2260		 £/₤
00A3/20A4		 ▒
2592
2_
32		 SP
0020		 !
0021		 "
0022		 #
0023		 $
0024		 %
0025		 &
0026		 '
0027		 (
0028		 )
0029		 *
002A		 +
002B		 ,
002C		 -
002D		 .
002E		 /
002F
3_
48		 0
0030		 1
0031		 2
0032		 3
0033		 4
0034		 5
0035		 6
0036		 7
0037		 8
0038		 9
0039		 :
003A		 ;
003B		 <
003C		 =
003D		 >
003E		 ?
003F
4_
64		 @
0040		 A
0041		 B
0042		 C
0043		 D
0044		 E
0045		 F
0046		 G
0047		 H
0048		 I
0049		 J
004A		 K
004B		 L
004C		 M
004D		 N
004E		 O
004F
5_
80		 P
0050		 Q
0051		 R
0052		 S
0053		 T
0054		 U
0055		 V
0056		 W
0057		 X
0058		 Y
0059		 Z
005A		 [
005B		 \
005C		 ]
005D		 ↑/^
2191/005E		 _
005F
6_
96		 `/⊤
0060/22A4		 a
0061		 b
0062		 c
0063		 d
0064		 e
0065		 f
0066		 g
0067		 h
0068		 i
0069		 j
006A		 k
006B		 l
006C		 m
006D		 n
006E		 o
006F
7_
112		 p
0070		 q
0071		 r
0072		 s
0073		 t
0074		 u
0075		 v
0076		 w
0077		 x
0078		 y
0079		 z
007A		 π
03C0		 |
007C		 →
2192		 Σ
03A3		 ⊦[nb 1]
22A6?
8–F_ ...

  Letter   Number   Punctuation   Symbol   Other   Undefined   Characters not in all versions

When Hewlett-Packard introduced the HP-42S in 1988, the FOCAL character set was revised to include more characters, including a number of characters already provided by the HP 82240A infrared thermo printer, which had been introduced in 1986,[5] as part of its extended variant of the 1985 revision of the HP Roman-8 character set,[6][7] although at completely different code points.

There is no code point definition for the euro sign in this character set.

Revised FOCAL character set (HP-42S)[1]
_0 _1 _2 _3 _4 _5 _6 _7 _8 _9 _A _B _C _D _E _F
0_
0		 ÷
00F7		 ×
00D7		 √
221A		 ∫
222B		 ░
2591		 Σ
03A3		 ▶[nb 2]
25B6		 π
03C0		 ¿
00BF		 ≤
2264		 LF/EOT
000A/0004		 ≥
2265		 ≠
2260		 ↵
21B5		 ↓
2193		 →
2192
1_
16		 ←
2190		 µ/μ
00B5/03BC		 £/₤
00A3/20A4		 °
00B0		 Å
00C5		 Ñ
00D1		 Ä
00C4		 ∡/∠
2221/2220		 ᴇ/⏨
1D07/23E8		 Æ
00C6		 …/‥
2026/2025		 ␛
241B		 Ö
00D6		 Ü
00DC		 ▒
2592		 ■/·
25A0/00B7
2_
32		 SP
0020		 !
0021		 "
0022		 #
0023		 $
0024		 %
0025		 &
0026		 '
0027		 (
0028		 )
0029		 *
002A		 +
002B		 ,
002C		 -
002D		 .
002E		 /
002F
3_
48		 0
0030		 1
0031		 2
0032		 3
0033		 4
0034		 5
0035		 6
0036		 7
0037		 8
0038		 9
0039		 :
003A		 ;
003B		 <
003C		 =
003D		 >
003E		 ?
003F
4_
64		 @
0040		 A
0041		 B
0042		 C
0043		 D
0044		 E
0045		 F
0046		 G
0047		 H
0048		 I
0049		 J
004A		 K
004B		 L
004C		 M
004D		 N
004E		 O
004F
5_
80		 P
0050		 Q
0051		 R
0052		 S
0053		 T
0054		 U
0055		 V
0056		 W
0057		 X
0058		 Y
0059		 Z
005A		 [
005B		 \
005C		 ]
005D		 ↑/^
2191/005E		 _
005F
6_
96		 `
0060		 a
0061		 b
0062		 c
0063		 d
0064		 e
0065		 f
0066		 g
0067		 h
0068		 i
0069		 j
006A		 k
006B		 l
006C		 m
006D		 n
006E		 o
006F
7_
112		 p
0070		 q
0071		 r
0072		 s
0073		 t
0074		 u
0075		 v
0076		 w
0077		 x
0078		 y
0079		 z
007A		 {
007B		 |
007C		 }
007D		 ~
007E		 ⊦[nb 1]
22A6?
8_
128		 ¦?
00A6?		 ¥?
00A5?		 ▓?
2593?		  
 		  
 		  
 		  
 		  
 		  
 		  
 		 ␊
240A		  
 		  
 		  
 		  
 		  
 
9–F_ ...

Translation from HP-42S character set to the modified HP Roman-8 (supported by HP 82240A etc.) character set:

HP translation vector
_0 _1 _2 _3 _4 _5 _6 _7 _8 _9 _A _B _C _D _E _F
0_ 0x81 0x82 0x83 0x84 0x04 0x85 0x86 0x87 0x08 0x89 0x04 0x8A 0x8B 0x0D 0x0E 0x8D
1_ 0x8E 0x8F 0xAF 0xB3 0xA2 0xB6 0xD8 0xA0 0x18 0xD3 0x9B 0x1B 0xDA 0xDB 0x7F 0xF2
2_ 0x20 0x21 0x22 0x23 0x24 0x25 0x26 0x27 0x28 0x29 0x2A 0x2B 0x2C 0x2D 0x2E 0x2F
3-6_ ...
7_ 0x70 0x71 0x72 0x73 0x74 0x75 0x76 0x77 0x78 0x79 0x7A 0x7B 0x7C 0x7D 0x7E 0x94
8_ 0x80 0x81 0x82 0x83 0x84 0x85 0x86 0x87 0x88 0x89 0x90 0x8B 0x8C 0x8D 0x8E 0x8F
9-F_ ...

See also
  • Hewlett-Packard calculator character sets

Notes
  1. The glyph at code point 127 (⊦) is called APPEND character in Hewlett-Packard terminology. In the HP-41C/CV/CX and HP-42S series of calculators, it is used to indicate that the following characters will be appended to the alpha register rather than replacing the existing contents of the register.
  2. The glyph at code point 6 is called GOOSE character in Hewlett-Packard terminology. While U+25B6 (▶) is the preferred Unicode character for maximum cross-compatibility with established RPL character set mappings, Free42 since release 2.0.1 (2017-04-23) maps to U+25B8 (▸) instead.

References
  1. RPN Scientific Calculator - Owner's Manual - HP-42S (PDF) (1 ed.). Hewlett-Packard. June 1988. pp. 288–291. 00042-90001, 00042-90002. Archived (PDF) from the original on 2018-01-04. Retrieved 2018-01-04.
  2. HP-42S RPN Scientific - Programming Examples and Techniques (PDF) (1 ed.). Corvallis, OR, USA: Hewlett-Packard Company, Corvallis Division. July 1988. 00042-90020, 00042-90019. Archived (PDF) from the original on 2018-01-04. Retrieved 2018-01-04.
  3. Hicks, David G. (2017) [1998]. "HP-41C Synthetic Programming". The Museum of HP Calculators (MoHPC). Archived from the original on 2018-01-06. Retrieved 2018-01-06.
  4. Hicks, David G. (1997). "Graphic byte code table". The Museum of HP Calculators (MoHPC). Archived from the original on 2018-01-06. Retrieved 2018-01-06.
  5. Nelson, Richard J. (May 2010). "HP 82240B IR Printer" (PDF). HP Solve (18). Archived from the original (PDF) on 2016-09-21. Retrieved 2016-09-21.
  6. HP 82240A Infrared Printer (PDF) (2 ed.). Corvallis, OR, USA: Hewlett Packard, Portable Computer Division. October 1986. HP reorder number 82240-90001 (82240-90008). Archived (PDF) from the original on 2016-08-06. Retrieved 2016-08-06.
  7. HP 82240B Infrared Printer (1 ed.). Corvallis, OR, USA: Hewlett Packard. August 1989. pp. 17–18. HP reorder number 82240-90014. Archived from the original on 2016-08-14. Retrieved 2016-08-01.

Further reading
  • HP-41C Operating Manual - A Guide for the Experienced User (PDF). Hewlett-Packard Company. June 1980. 00041-90259. Archived (PDF) from the original on 2018-01-04. Retrieved 2018-01-04.
  • Oerttel, Burkhard; Hümpfner, Reinhold; Meier, Bernhard; Schilli, Michael; Weber, Andreas; Leissner, Frank; Kaiser, Axel; Strewinski, Reinhard; von Borries, Sebastian; Dalkowski, Heinz; Fegert, Stefan (2014) [1989]. Fegert, Stefan; Dalkowski, Heinz (eds.). Programmsammlung für den HP-41 (PDF) (in German). Berlin, Germany: Heldermann Verlag. ISBN 3-88538-809-X. Archived (PDF) from the original on 2018-01-04. Retrieved 2018-01-04.
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