SYMBiFACE II:Rewriteable roms - Revision history

Arnoldemu at 15:38, 6 February 2016

2016-02-06T15:38:04Z

Arnoldemu at 10:39, 31 January 2016

2016-01-31T10:39:23Z

Arnoldemu at 10:38, 31 January 2016

2016-01-31T10:38:02Z

Arnoldemu at 10:36, 31 January 2016

2016-01-31T10:36:11Z

Arnoldemu at 10:34, 31 January 2016

2016-01-31T10:34:46Z

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Arnoldemu: /* Mechanisms */

2016-01-31T10:07:13Z

‎Mechanisms

Arnoldemu at 10:04, 31 January 2016

2016-01-31T10:04:54Z

Prodatron: /* Mechanisms */

2007-01-21T08:17:56Z

‎Mechanisms

83.26.251.89: /* Mechanisms */

2007-01-14T14:21:09Z

‎Mechanisms

Prodatron: added category

2006-08-28T00:10:27Z

added category

@@ Line 9: / Line 9: @@
 When J2 is connected and all switches are off then no roms are visible. This now allows you to program the ROMs safely.
-NOTE: Symbiface 2 does a partial decode of the current rom written to #df00. It only processes the lower 5 bits. This means the roms will repeat 4 times through the entire 256 ROM range. This also means they will override Plus cartridge pages.
+Selecting the ROM is done by writing the number to i/o port dfxx. Symbiface decodes the upper 8-bit of the address completely. It looks for the following pattern:
 Symbiface 2 also has the potential to override rom 7 (AMSDOS). On some CPCs this is 100% reliable, on others it is not possible and on some it is unreliable.
 == Mechanisms ==

← Older revision		Revision as of 10:39, 31 January 2016
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	NOTE: Symbiface 2 does a partial decode of the current rom written to #df00. It only processes the lower 5 bits. This means the roms will repeat 4 times through the entire 256 ROM range. This also means they will override Plus cartridge pages.		NOTE: Symbiface 2 does a partial decode of the current rom written to #df00. It only processes the lower 5 bits. This means the roms will repeat 4 times through the entire 256 ROM range. This also means they will override Plus cartridge pages.
		+
		+	Symbiface 2 also has the potential to override rom 7 (AMSDOS). On some CPCs this is 100% reliable, on others it is not possible and on some it is unreliable.

	== Mechanisms ==		== Mechanisms ==

@@ Line 9: / Line 9: @@
 When J2 is connected and all switches are off then no roms are visible. This now allows you to program the ROMs safely.
-NOTE: Symbiface 2 does a partial decode of the current rom written to #df00. It only processes the lower 5 bits. This means the roms will repeat 4 times through the entire 256 ROM range. This also means they will clash with C4CPC and Plus cartridge roms.
+NOTE: Symbiface 2 does a partial decode of the current rom written to #df00. It only processes the lower 5 bits. This means the roms will repeat 4 times through the entire 256 ROM range. This also means they will override Plus cartridge pages.
 == Mechanisms ==

← Older revision		Revision as of 10:36, 31 January 2016
Line 8:		Line 8:

	When J2 is connected and all switches are off then no roms are visible. This now allows you to program the ROMs safely.		When J2 is connected and all switches are off then no roms are visible. This now allows you to program the ROMs safely.
		+
		+	NOTE: Symbiface 2 does a partial decode of the current rom written to #df00. It only processes the lower 5 bits. This means the roms will repeat 4 times through the entire 256 ROM range. This also means they will clash with C4CPC and Plus cartridge roms.

	== Mechanisms ==		== Mechanisms ==

@@ Line 2: / Line 2: @@
 The re-writeable ROMs are stored on a static RAM. The static RAM is powered by a CR2032 battery to remember it's contents when the symbiface 2 is powered down.
 == Mechanisms ==
@@ Line 8: / Line 14: @@
 {|{{Prettytable|width: 700px; font-size: 2em;}}
-|'''INP &FD17''' || show the current ROM (selected by #df00) between #4000 and #7fff. Now it can be read and rewritten. You do not need to enable the upper rom using port #7fxx and all roms can be read/written regardless of J2 state or rom enable/disable state.
+|'''INP &FD17''' || show the current ROM (selected by #df00) between #4000 and #7fff. Now it can be read and written. All roms on the Symbiface 2 can be accessed this way regardless of J2 or dipswitches state. You also do not need to enable the upper rom using port #7fxx.
 |-
-|'''OUT &FD17''' || disable the previouse mentioned ROM write mode.
+|'''OUT &FD17''' || disable the previously mentioned ROM write mode. Any value can be written.
 |-
-|'''OUT &FD11''' || disable all SYMBiFACE II Roms. You won't see any additional ROMS anymore, only the CPCs' inbuilt ones.
+|'''OUT &FD11''' || disable all SYMBiFACE II Roms. The roms will not be visible to the CPC, you will only see CPC's inbuilt ones or ROMs from other rom-boards.
 |-
-|'''INP &FD11''' || enable the SYMBiFACE II roms.
+|'''INP &FD11''' || enable the SYMBiFACE II roms. Symbiface 2 roms will be visible if enabled through J2 or switches.
 |}

← Older revision		Revision as of 10:04, 31 January 2016
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−	This article decribes, how to map the '''rewriteable ROMs''' of the [[SYMBiFACE II]] card into the ram area, so that you can change its content.	+	This article decribes, how to map the '''rewriteable ROMs''' of the [[SYMBiFACE II]] card into the ram area so that you can change its content.
		+
		+	The re-writeable ROMs are stored on a static RAM. The static RAM is powered by a CR2032 battery to remember it's contents when the symbiface 2 is powered down.

	== Mechanisms ==		== Mechanisms ==

@@ Line 3: / Line 3: @@
 == Mechanisms ==
-Please note, that the following commands ignore all values. So it doesn't matter, what you "out". When you "inp" you won't get any senseless numbers.
+Please note, that the following commands ignore all values. So it doesn't matter, what you "out". When you "inp" you won't get any meaningful numbers.
 {|{{Prettytable|width: 700px; font-size: 2em;}}

← Older revision		Revision as of 00:10, 28 August 2006
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	* [[Programming:SYMBiFACE_II\|SYMBiFACE II documentations]]		* [[Programming:SYMBiFACE_II\|SYMBiFACE II documentations]]
		+
		+	[[Category:Programming]]