MZ3500
10. MZ1K01 KEYBOARD CONTROLLER CIRCUIT DESCRIPTION
10-1. Specification of keyboard control
1)Input Buffer Capacity: 64 bytes
•
•When an overflow is detected, the overflow code is affired to the
2)Rollover
•2 key rollover (exemption in the CTRL mode)
(Entry of the second key depression can be accepted even if more than one key is pressed at same time.)
•Simultaneous depression of more than three keys is ingnored.
3)Key bounce
15msec (Key spec
(Indicates unstable state as shown in Fig.
4)Key
5msec (norma), 20msec (max), 15msec (allows for key bounce)
5)DEF Key
Twenty definable keys are available in combination with the CTRL key.
[
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6)Handling of functional symbols and graphic symbols See the code table.
7)Use of the CTRL key to discriminate RUN and CONT of the DEB key.
Push the DEB in conjunction with the CTRL key to start running.
8)Handling of special codes
COPY command: CTRL 1 J (ten key)
ESCape CTRL
BRKCTRL
9)PRO/OP
Sent to the CPU after power on and when PRO/OP is changed.
10)HOME key
CTRL [ HOME] Returns home after clearing the display screen.
[HOME] Only the cursor returns home.
11)
| uior |
LMU / | rnlNI |
LML) o | INrU T |
UMU 4 | USING |
pft/in "7 . | (jU I U |
pr\ci ID | |
| Kb 1 UnN |
| Lib 1 |
PMH n . |
|
PMn A | At rrn |
| ULUbt |
PMH n - | n ATA |
| nrUnMA 1 fF |
CMU K. | K.hY IN |
PMH i | i OAH |
r*Mn r\ - |
|
| nhAU |
PMH c | CA\/C |
12) Mode indication on LED
Acrn | i nr^w |
13)REP
Key repetition will take place when a key depressed for more than 0.64second. Entry of other keys is permitted during key repetition. When two keys are depresssd at the same time, an alternate key entry will not be accepted. This rule does not apply to simultaneous depression of more than three keys.
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