Edit Port Form: Keyboard

You do not have permission to edit this page, for the following reason:

The action you have requested is limited to users in the group: Users.

Number:
Decimal:
Bit Mask
ShortDesc:
Readable:
Writable:
Subsystem:

Free text:

Reads keys on the keyboard depending on the upper byte of the port number. The five keys are represented by bits 0-4 of the read byte, listed below with bit 4 first down to bit 0. A zero means that the key is pressed. The top eight bits of the port address are active low signals that select one or more key rows for reading. {| class="wikitable" ! Port upper byte !! Keys affected (row of keys) |- | $7F (bit 7) || B, N, M, Symbol Shift, Space |- | $BF (bit 6) || H, J, K, L, Enter |- | $DF (bit 5) || Y, U, I, O P |- | $EF (bit 4) || 6, 7, 8, 9, 0 |- | $F7 (bit 3) || 5, 4, 3, 2, 1 |- | $FB (bit 2) || T, R, E, W, Q |- | $FD (bit 1) || G, F, D, S, A |- | $FE (bit 0) || V, C, X, Z, Caps Shift |} [[File:Speckeys.png]]

Summary:

This is a minor edit Watch this page

Cancel