TRS-80 character set

The TRS-80 computer manufacturered by Tandy / Radio Shack contains an 8-bit character set.[1] It is partially derived from ASCII, and shares the code points from 32 - 95 on the standard model. Code points 96 - 127 are supported on models that have been fitted with a lower-case upgrade.[2]

The character set consists of letters, various numeric and special characters[1] as well as 64 semigraphics called squots (square dots) from a 2×3 matrix.[3] These were located at code points 128 to 191 with bits 5-0 following their binary representation,[3] similar to alpha-mosaic characters in World System Teletext.[4] These characters were used for graphics in games, such as Android Nim.[5]

Character set

The following table shows the TRS-80 model I character set. Each character is shown with a potential Unicode equivalent. Space and control characters are represented by the abbreviations for their names.

TRS-80 model I character set[6][3][7][8]
_0 _1 _2 _3 _4 _5 _6 _7 _8 _9 _A _B _C _D _E _F
0_
0
 
 
 
 
 
 
 
 		 BS[lower-alpha 1]
0008
 		 LF
000A
 
 		 CR
000D		 con[lower-alpha 2]
 		 coff[lower-alpha 3]
 
1_
16
 
 
 
 
 
 
 		 32[lower-alpha 4]
 		 ←[lower-alpha 5]
 		 →[lower-alpha 6]
 		 ↓[lower-alpha 7]
 		 ↑[lower-alpha 8]
 		 home[lower-alpha 9]
 		 sol[lower-alpha 10]
 		 ceol[lower-alpha 11]
 		 ceof[lower-alpha 12]
 
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		 ↑
 		 ↓
 		 ←
 		 →
 		 _
005F
6_
96
 		 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		 ±
00B1
8_
128		 NBSP
00A0
1FB00
1FB01
1FB02
1FB03
1FB04
1FB05
1FB06
1FB07
1FB08
1FB09
1FB0A
1FB0B
1FB0C
1FB0D
1FB0E
9_
144
1FB0F
1FB10
1FB11
1FB12
1FB13
258C
1FB14
1FB15
1FB16
1FB17
1FB18
1FB19
1FB1A
1FB1B
1FB1C
1FB1D
A_
160
1FB1E
1FB1F
1FB20
1FB21
1FB22
1FB23
1FB24
1FB25
1FB26
1FB27
2590
1FB28
1FB29
1FB2A
1FB2B
1FB2C
B_
176
1FB2D
1FB2E
1FB2F
1FB30
1FB31
1FB32
1FB33
1FB34
1FB35
1FB36
1FB37
1FB38
1FB39
1FB3A
1FB3B
2588
C_
192		 [lower-alpha 13]
 		 tab
 		 tab
 		 tab
 		 tab
 		 tab
 		 tab
 		 tab
 		 tab
 		 tab
 		 tab
 		 tab
 		 tab
 		 tab
 		 tab
 		 tab
 
D_
208		 tab
 		 tab
 		 tab
 		 tab
 		 tab
 		 tab
 		 tab
 		 tab
 		 tab
 		 tab
 		 tab
 		 tab
 		 tab
 		 tab
 		 tab
 		 tab
 
E_
224		 tab
 		 tab
 		 tab
 		 tab
 		 tab
 		 tab
 		 tab
 		 tab
 		 tab
 		 tab
 		 tab
 		 tab
 		 tab
 		 tab
 		 tab
 		 tab
 
F_
240		 tab
 		 tab
 		 tab
 		 tab
 		 tab
 		 tab
 		 tab
 		 tab
 		 tab
 		 tab
 		 tab
 		 tab
 		 tab
 		 tab
 		 tab
 		 tab
 

  Letter   Number   Punctuation   Symbol   Other   Undefined

  1. Backspace and erase current character
  2. Cursor on
  3. Cursor off
  4. Converts to wide 32 column mode
  5. Backspace ← Cursor
  6. Advance → Cursor
  7. Downward ↓ linefeed
  8. Upward ↑ linefeed
  9. Move cursor to (0,0), also turns off 32 column mode
  10. Move to start of line
  11. Erase to end of line
  12. Erase to end of frame
  13. 192 to 255 are "Space Compression Codes", tabs for 0 to 63 spaces

References

Citations

  1. Fylstra, Dan (April 1978). "Radio Shack TRS-80: An Owner's Report" (PDF). BYTE. Boston, MA, USA: BYTE Publications Inc.: 49–59. Archived (PDF) from the original on 2017-07-29. Retrieved 2017-07-29.
  2. Heiserman 1983, p. 15.
  3. Goldklang, Ira (2015). "Graphic Tips & Tricks". Archived from the original on 2017-07-29. Retrieved 2017-07-29.
  4. Wiels. "TeleText - Het Protocol" (in Dutch). Mosaic characters. Archived from the original on 2017-12-21. Retrieved 2017-12-21.
  5. Crawford 2003, p. 202.
  6. Level II Basic Manual. Tandy / Radio Shack. 1978. pp. C1/C2.
  7. "TRSM1ICH.TXT", L2/19-025: Proposal to add characters from legacy computers and teletext to the UCS (PDF), 2019-01-04
  8. Heiserman 1983, p. 243.

Sources

Further reading
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