Differences

This shows you the differences between two versions of the page.

--- hardware:i_o_ports [2016/06/11 12:10]
ex_writer
+++ hardware:i_o_ports [2016/06/13 23:19]
ex_writer [Input/Output Ports]
@@ Line 23: / Line 23: @@
 | 12H | TONEB | Tone B Frequency | SW2 | Player 3 Control Handle |
 | 13H | TONEC | Tone C Frequency | SW3 | Player 4 Control Handle |
-| 14H | VIBRA | Vibrato/Tremolo | KEY0 | Keypad Column 0 (right) |
+| 14H | VIBRA | Vibrato Speed/Depth | KEY0 | Keypad Column 0 (right) |
-| 15H | VOLAB |Tone C Volume, Noise Modulation Control | KEY1 | Keypad Column 1 |
+| 15H | VOLC | Modulation Type (Noise/Vibrato), Tone C Volume | KEY1 | Keypad Column 1 |
-| 16H | VOLC | Tone A Volume, Tone B Volume | KEY2 | Keypad Column 2 |
+| 16H | VOLAB | Tone B Volume, Tone A Volume | KEY2 | Keypad Column 2 |
 | 17H | VOLN | Noise Volume | KEY3 | Keypad Column 3 (left) |
 | 18H | SNDBX | Sound Block Transfer | | |
@@ Line 77: / Line 77: @@
 Interrupt Line/Horizontal Address Feedback. On write, this register sets the scan line number on which to generate a line interrupt back to the Z80. On read, this register contains the horizontal address (i.e., position in the line) that a Light Pen Interrupt was received on.
+==== TONMO / SW0 ($10) ====
+TONMO is the "tone" (i.e., frequency) of the [[hardware:music processor#master oscillator]].
+SW0
 ==== XPAND ($19) ====