Difference between revisions of "Keyboard"

Latest revision as of 01:20, 30 December 2020

The keyboard is attached to the slow bus and accessed by the system VIA. On the BBC there are 74 keys including BREAK, 93 including BREAK on the Master series. On the BBC 73 keys and 8 keyboard links are wired in a 10 × 8 matrix; on the Master 92 keys are a 13 × 8 matrix. The two SHIFT keys are connected to one cell and cannot be told apart. The BREAK key is on a separate circuit and resets the computer.

The Electron has a superficially similar keyboard, but with a reduced number of keys with many sharing functions. The Electron keyboard is accessed via hardware addressed in sideways ROM space.

All keys except CTRL and SHIFT cause an interrupt when pressed, which makes the BBC scan the keyboard to identify the key(s) that are held down.

The keyboard is an ECMA-23^[1] bit-paired layout^[2], previously common on programming-orientated computer systems, unlike the typewriter-paired layout that is standard on mechanical typewriters and modern PCs. Pressing SHIFT or CTRL neatly adds or subtracts a power of two from the ASCII value of the base character, except for the singleton keys space, 0, @ and DELETE; and the _ £ key. The layout is shown in Chapter 1 of the User Guide.

There is a circuit diagram of the keyboard on page 489 of The Advanced User Guide.

BBC Micro keyboard types
8bs.com Type^[3]	Seen on	Key legends	Key sound	PCB colour	Chassis plate	Key switches	Space bar support	DIP switch orientation
Type 1	B, ?	Large	Flat	Beige	Narrow margins, lip at front and rear	White, round body, square-edged shoulder, cross head	Plastic tabs and wire rod (concealed)	East-west (under DELETE)
Type 2	B, B+	Small	Echoing	Tawny brown	Wide margins, deep skirt	Black, square body, chamfered shoulder, cross head	Wire rod support	North-south
Type 3	?	Large	Flat	Tawny brown	Wide margins, shallow skirt	Dark grey, deep bevelled shoulder, square cup head	Plastic guides?	North-south
Type 4	?	Large	Echoing	Beige	Narrow margins, lip at front	Black, square body, chamfered shoulder, cross head	Wire rod support	East-west (between SHIFT and DELETE)

Keyboard Scan Codes

The number under each key is the scan code in hexadecimal.

f₀

&20

f₁

&71

f₂

&72

f₃

&73

f₄

&14

f₅

&74

f₆

&75

f₇

&16

f₈

&76

f₉

&77

BREAK

ESCAPE

&70

!
1

&30

"
2

&31

#
3

&11

$
4

&12

%
5

&13

&
6

&34

'
7

&24

(
8

&15

)
9

&26

Ø

&27

=
-

&17

~
^

&18

|
\

&78

←

&19

→

&79

TAB

&60

Q

&10

W

&21

E

&22

R

&33

T

&23

Y

&44

U

&35

I

&25

O

&36

P

&37

@

&47

{
[

&38

£
—

&28

↑

&39

↓

&29

CAPS LOCK

&40

CTRL

&01

A

&41

S

&51

D

&32

F

&43

G

&53

H

&54

J

&45

K

&46

L

&56

+
;

&57

*
:

&48

}
]

&58

RETURN

&49

SHIFT LOCK

&50

SHIFT

&00

Z

&61

X

&42

C

&52

V

&63

B

&64

N

&55

M

&65

<
,

&66

>
.

&67

?
/

&68

SHIFT

&00

DELETE

&59

COPY

&69

SPACE

&62

bit 7

&02

bit 6

&03

bit 5

&04

bit 4

&05

bit 3

&06

bit 2

&07

bit 1

&08

bit 0

&09

Scan Code Matrix

Columns 10 to 12 contain the Master keypad scan codes. Columns 12 to 15 with scan codes in (brackets) are keys on RISC OS/ Archimedes and other systems.^[4] Note that in the diagram rows 0 and 7 are swapped to be similar to the physical keyboard layout.

	C0	C1	C2	C3	C4	C5	C6	C7	C8	C9	C10	C11	C12	C13	C14	C15
R7	ESCAPE &70	f₁ &71	f₂ &72	f₃ &73	f₅ &74	f₆ &75	f₈ &76	f₉ &77	\| \ &78	→ &79	4 &7A	5 &7B	2 &7C	Win Left (&7D)	Win Right (&7E)	Win Menu (&7F)
R1	Q &10	# 3 &11	$ 4 &12	% 5 &13	f₄ &14	( 8 &15	f₇ &16	= - &17	~ ^ &18	← &19	6 &1A	7 &1B	f₁₁ (&1C)	f₁₂ (&1D)	f₁₀ (&1E)	Scroll Lock (&1F)
R2	f₀ &20*	W &21	E &22	T &23	' 7 &24	I &25	) 9 &26	Ø &27	£ _ &28	↓ &29	8 &2A	9 &2B	Pause Break (&2C)	~ ¬ ' ` (&2D)	¤ \| £ ¥ (&2E)	Back Space (&2F)
R3	! 1 &30	" 2 &31	D &32	R &33	& 6 &34	U &35	O &36	P &37	{ [ &38	↑ &39	+ &3A	- &3B	KEYPAD RETURN &3C	Insert (&3D)	Home (&3E)	Page Up (&3F)
R4	CAPS LOCK &40	A &41	X &42	F &43	Y &44	J &45	K &46	@ &47	* : &48	RETURN &49	/ &4A	KEYPAD DELETE &4B	. &4C	Num Lock (&4D)	Page Down (&4E)	" @ ' ' (&4F)
R5	SHIFT LOCK &50	S &51	C &52	G &53	H &54	N &55	L &56	+ ; &57	} ] &58	DELETE &59	# ~ # &5A	* &5B	, &5C	+ = (&5D)	\| \ (&5E)*	_ \ (&5F)*
R6	TAB &60	Z &61	SPACE &62	V &63	B &64	M &65	< , &66	> . &67	? / &68	COPY &69	Ø &6A	1 &6B	3 &6C	No Conv (&6D)	Conv (&6E)	Kana (&6F)
R0	SHIFT &00	CTRL &01	bit 7 &02	bit 6 &03	bit 5 &04	bit 4 &05	bit 3 &06	bit 2 &07	bit 1 &08	bit 0 &09
R0	SHIFT &00	CTRL &01	ALT &02	Left Shift &03	Left Ctrl &04	Left Alt &05	Right Shift &06	Right Ctrl &07	Right Alt &08	Mouse Select &09	Mouse Menu &0A	Mouse Adjust &0B

Notes:

&20: keyboards with 'Print' generate f0 keypress
&2D: key to the left of 1 on PC layout keyboard
&5E: key between left shift and Z on PC layout keyboard^[5]
&5F: key between ? and right shift on PC layout keyboard^[5]

References

beardo 00:01, 18 October 2007 (BST) jgharston 00:19, 30 December 2020 (GMT)

[1] Wikipedia: ECMA-23 Keyboard standard

[2] Wikipedia: Bit-paired keyboards

[3] Keyboard photos on mirror of 8bs.com.

[4] Keyboard scan codes.

[iyonix-5] 5.0 ^5.1 RISC OS Japanese Support Functional Specification

[1]

[2]

[3]

[4]

[5]

@@ Line 1: / Line 1: @@
 [[Category:Hardware]]
-The '''keyboard''' is attached to the [[slow bus]] and accessed by the [[system VIA]].  There are 74 keys including BREAK.  73 keys and 8 keyboard links are wired in a 10 &times; 8 matrix; the two SHIFT keys are connected to one cell and cannot be told apart.  The BREAK key is on a separate circuit and resets the computer.
+The '''keyboard''' is attached to the [[slow bus]] and accessed by the [[system VIA]]. On the BBC there are 74 keys including BREAK, 93 including BREAK on the Master series. On the BBC 73 keys and 8 keyboard links are wired in a 10 &times; 8 matrix; on the Master 92 keys are a 13 &times; 8 matrix. The two SHIFT keys are connected to one cell and cannot be told apart. The BREAK key is on a separate circuit and resets the computer.
+The Electron has a superficially similar keyboard, but with a reduced number of keys with many sharing functions. The Electron keyboard is accessed via hardware addressed in sideways ROM space.
 All keys except CTRL and SHIFT cause an interrupt when pressed, which makes the BBC scan the keyboard to identify the key(s) that are held down.
-The keyboard has an unusual ''bit-paired'' layout, unlike the ''typewriter-paired'' layout that is standard on British PCs.  Pressing SHIFT or CTRL neatly adds or subtracts a power of two from the [[ASCII]] value of the base character, except for the singleton characters space, 0, @, _, &pound; and [[VDU 127|DELETE]].  The layout is shown in Chapter 1 of the User Guide.
+The keyboard is an ECMA-23<ref>[https://en.wikipedia.org/wiki/ECMA-23 Wikipedia: ECMA-23 Keyboard standard]</ref> ''bit-paired'' layout<ref>[https://en.wikipedia.org/wiki/Bit-paired_keyboard Wikipedia: Bit-paired keyboards]</ref>, previously common on programming-orientated computer systems, unlike the ''typewriter-paired'' layout that is standard on mechanical typewriters and modern PCs. Pressing SHIFT or CTRL neatly adds or subtracts a power of two from the [[ASCII]] value of the base character, except for the singleton keys space, 0, @ and [[VDU 127|DELETE]]; and the _ &pound; key. The layout is shown in Chapter 1 of the User Guide.
 There is a circuit diagram of the keyboard on page 489 of ''The Advanced User Guide''.
@@ Line 64: / Line 66: @@
 The number under each key is the scan code in hexadecimal.
-<table style="font-family:sans-serif;text-align:center;">
+<table style="font-family:sans-serif;text-align:center;" class="mw-widebody">
 <tr><td style="border-spacing:0px;"><div style="display:table-cell;text-align:center;">
 <div style="display:inline-block;">
@@ Line 236: / Line 238: @@
 ===Scan Code Matrix===
-Columns 10 to 12 contain the Master keypad scan codes. Columns 12 to 15 with scan codes in (brackets) are keys on RISC OS/Archimedes and other systems.<ref>[http://mdfs.net/System/C/Lib/console.txt Keyboard scan codes.]</ref> Note that in the diagram rows 0 and 7 are swapped to be similar to the physical keyboard layout.
+Columns 10 to 12 contain the Master keypad scan codes. Columns 12 to 15 with scan codes in (brackets) are keys on RISC OS/ Archimedes and other systems.<ref>[http://mdfs.net/System/C/Lib/console.txt Keyboard scan codes.]</ref> Note that in the diagram rows 0 and 7 are swapped to be similar to the physical keyboard layout.
-<table style="font-family:sans-serif;text-align:center;">
+<table style="font-family:sans-serif;text-align:center;" class="mw-widebody" cellspacing="0">
 <tr><th><th>C0<th>C1<th>C2<th>C3<th>C4<th>C5<th>C6<th>C7<th>C8<th>C9<th>C10<th>C11<th>C12<th>C13<th>C14<th>C15<tr><th>R7
 <td><div style="display:inline-block;"><div style="width:3rem;height:3rem;border-style:solid;border-width:1px;text-align:center;display:table-cell;vertical-align:middle;color:white;background-color:#222222;border-color:#444444 #000000 #000000 #444444;font-size:x-small;">ESCAPE</div></div><br><span style="font-size:x-small">&amp;70</span>
@@ Line 338: / Line 340: @@
 <td><div style="display:inline-block;"><div style="width:3rem;height:3rem;border-style:solid;border-width:1px;text-align:center;display:table-cell;vertical-align:middle;color:white;background-color:#222222;border-color:#444444 #000000 #000000 #444444;font-size:large;">*</div></div><br><span style="font-size:x-small">&amp;5B</span>
 <td><div style="display:inline-block;"><div style="width:3rem;height:3rem;border-style:solid;border-width:1px;text-align:center;display:table-cell;vertical-align:middle;color:white;background-color:#222222;border-color:#444444 #000000 #000000 #444444;font-size:large;">,</div></div><br><span style="font-size:x-small">&amp;5C</span>
-<td><div style="display:inline-block;"><div style="width:3rem;height:3rem;border-style:solid;border-width:1px;text-align:center;display:table-cell;vertical-align:middle;color:white;background-color:#222222;border-color:#444444 #000000 #000000 #444444;font-size:large;">+<br>=</div></div><br><span style="font-size:x-small">(&amp;5D)</span>
+<td><div style="display:inline-block;"><div style="width:3rem;height:3rem;border-style:solid;border-width:1px;text-align:center;display:table-cell;vertical-align:middle;color:white;background-color:#222222;border-color:#444444 #000000 #000000 #444444;font-size:large;line-height:1.1em;">+<br>=</div></div><br><span style="font-size:x-small">(&amp;5D)</span>
 <td><div style="display:inline-block;"><div style="width:3rem;height:3rem;border-style:solid;border-width:1px;text-align:center;display:table-cell;vertical-align:middle;color:white;background-color:#222222;border-color:#444444 #000000 #000000 #444444;font-size:large;line-height:1.1em;">|<br>\</div></div><br><span style="font-size:x-small">(&amp;5E)*</span>
 <td><div style="display:inline-block;"><div style="width:3rem;height:3rem;border-style:solid;border-width:1px;text-align:center;display:table-cell;vertical-align:middle;color:white;background-color:#222222;border-color:#444444 #000000 #000000 #444444;font-size:large;line-height:1.1em;">_<br>\</div></div><br><span style="font-size:x-small">(&amp;5F)*</span>
@@ Line 392: / Line 394: @@
 Notes:
 * &amp;20: keyboards with 'Print' generate f0 keypress
+* &amp;2D: key to the left of 1 on PC layout keyboard
 * &amp;5E: key between left shift and Z on PC layout keyboard<ref name="iyonix">[https://web.archive.org/web/20130401185753/http://www.iyonix.com/32bit/2205203-02.htm RISC OS Japanese Support Functional Specification]</ref>
 * &amp;5F: key between ? and right shift on PC layout keyboard<ref name="iyonix"/>
+==See also==
+* [[INKEY numbers]]
+* [[Key codes]]
 ==References==
 <references />
--- [[User:Beardo|beardo]] 00:01, 18 October 2007 (BST)
+----
+[[User:Beardo|beardo]] 00:01, 18 October 2007 (BST)
+[[User:JGharston|jgharston]] 00:19, 30 December 2020 (GMT)

Difference between revisions of "Keyboard"

Latest revision as of 01:20, 30 December 2020

Contents

Keyboard Scan Codes

Scan Code Matrix

See also

References

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