84PCE:Ports:0006 - Revision history

Zeroko: Updated effect of bits 0 & 1 on port access (oops)

2021-02-21T05:52:52Z

Updated effect of bits 0 & 1 on port access (oops)

Zeroko: Updated effect of bits 0 & 1 on port access

2021-02-21T05:40:01Z

Updated effect of bits 0 & 1 on port access

Dr. D'nar: /* Bit [0] */

2019-10-21T00:02:10Z

‎Bit [0]

Jacobly: /* Bit [3] */

2019-06-29T04:46:56Z

‎Bit [3]

Jacobly: /* Bit [3] */

2019-06-29T04:46:49Z

‎Bit [3]

Jacobly: /* Bit [2] */

2018-02-01T20:31:43Z

‎Bit [2]

Jacobly: Change based on known behavior, the other bits should be investigated more.

2017-08-08T07:13:05Z

Change based on known behavior, the other bits should be investigated more.

MateoConLechuga: /* Details */

2017-08-06T18:07:32Z

‎Details

MateoConLechuga: Created page with "0006 - Unknown == Synopsis == '''Port Number:''' 0006 '''Function:''' Unknown == Details == This port seems to affect the display refres..."

2017-08-06T10:39:06Z

Created page with "0006 - Unknown == Synopsis == '''Port Number:''' 0006 '''Function:''' Unknown == Details == This port seems to affect the display refres..."

New page

[[Category:84PCE:Ports:By_Address|0006 - Unknown]]
== Synopsis ==
'''Port Number:''' 0006

'''Function:''' Unknown

== Details ==

This port seems to affect the display refresh.

=== Bit [0] ===
Latches value written, no apparent effect.

=== Bit [1] ===
Reset this bit to disable display upadates.

=== Bit [2] ===
Set this bit to enable display updates if bit 1 is ever reset.

=== Bits [7:3] ===
Writes do not latch; no apparent effect.

@@ Line 10: / Line 10: @@
 === Bit [0] ===
-Latches value written, OS defaults this to set. Resetting this bit reduces current consumption by about 3 mA, so it does ''something.'' When reset, the [[84PCE:Ports:3000|USB controller ports]] cannot be written & read as 20 0E 3E 00, repeating every 4 bytes.
+Latches value written, OS defaults this to set. Resetting this bit reduces current consumption by about 3 mA, so it does ''something.'' When reset, the [[84PCE:Ports:3000|USB controller ports]] cannot be accessed.
 === Bit [1] ===
-Reset this bit to disable display upadates. When reset, the [[84PCE:Ports:4000|LCD controller ports]] cannot be written & read as B1 00 00 00 (revision C) or 2D 09 00 00 (revision N), repeating every 4 bytes.
+Reset this bit to disable display upadates. When reset, the [[84PCE:Ports:4000|LCD controller ports]] also cannot be accessed.
 === Bit [2] ===

@@ Line 24: / Line 24: @@
 === Bit [3] ===
 Writes do not latch; no apparent effect.
 Used by OS on Python Edition.

@@ Line 24: / Line 24: @@
 === Bit [3] ===
 Writes do not latch; no apparent effect.
 === Bit [4] ===

@@ Line 18: / Line 18: @@
 Set this bit to enable display updates if bit 1 is ever reset. ???
-This bit is known to unlock protected mmio ports, such as [[84PCE:Ports:2000|SHA256]].
+This bit is known to unlock protected ports, such as [[84PCE:Ports:2000|SHA256]],
 It is cleared every time the boot code interrupt handler runs.

@@ Line 16: / Line 16: @@
 === Bit [2] ===
-Set this bit to enable display updates if bit 1 is ever reset.
+Set this bit to enable display updates if bit 1 is ever reset. ???
 === Bit [3] ===
@@ Line 22: / Line 25: @@
 === Bit [4] ===
-Flash lock status.
+<s>Flash lock status.</s>
 === Bits [7:3] ===
 Writes do not latch; no apparent effect.