Graphics ROM - Revision history

Mr z: /* GROM Picture Catalog */

2010-12-04T10:08:33Z

‎GROM Picture Catalog

Mr z: Protected "Graphics ROM" ([edit=autoconfirmed] (indefinite) [move=autoconfirmed] (indefinite))

2010-12-04T08:24:30Z

Protected "Graphics ROM" ([edit=autoconfirmed] (indefinite) [move=autoconfirmed] (indefinite))

Arnauld: added link to Picture Encoding

2005-01-31T16:48:16Z

added link to Picture Encoding

Arnauld at 16:30, 31 January 2005

2005-01-31T16:30:38Z

Arnauld: added GROM Picture Catalog

2005-01-31T16:28:24Z

added GROM Picture Catalog

Mr z at 01:08, 24 January 2005

2005-01-24T01:08:14Z

Mr z at 01:06, 24 January 2005

2005-01-24T01:06:26Z

Mr z at 22:18, 11 January 2005

2005-01-11T22:18:51Z

Pingaso at 22:10, 11 January 2005

2005-01-11T22:10:56Z

Pingaso at 22:09, 11 January 2005

2005-01-11T22:09:49Z

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 - 126      80 - 95     p q r s t u v w x y z { | } ~
-The next table maps hexadecimal GROM card numbers to ASCII characters.  It is the same information as the above table, in a slightly different form.  The column at the left gives the first hexadecimal digit, and the row across the top gives the second hexadecimal digit.  For instance, the letter A would be GROM card #$21.
+The following maps hexadecimal GROM card numbers to both the ASCII characters shown above, as well as the generic graphic elements in the GROM.  The diagram omits the portion of GROM that contains EXEC code.  For the ASCII portion, it is the same information as the above table, in a slightly different form.  The column at the left gives the first hexadecimal digit, and the row across the top gives the second hexadecimal digit.  For instance, the letter A would be GROM card #$21.  Cards #$D5 and up contain EXEC code.
-        +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
+[[File:Grom index.png||GROM image tiles|]]

← Older revision		Revision as of 16:48, 31 January 2005
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	The GROM uses the [[STIC]]'s [[VBlank Interrupt]] to switch to the CPU-access memory map. The CPU's BUSAK signal switches the GROM back to the display-generation memory map. The GROM looks at the BAR' and DWS' signals from the STIC to choose between Color Stack and Foreground/Background decoding. If both of these signals pulse positive together, the GROM switches to Foreground/Background mode until the next interrupt.		The GROM uses the [[STIC]]'s [[VBlank Interrupt]] to switch to the CPU-access memory map. The CPU's BUSAK signal switches the GROM back to the display-generation memory map. The GROM looks at the BAR' and DWS' signals from the STIC to choose between Color Stack and Foreground/Background decoding. If both of these signals pulse positive together, the GROM switches to Foreground/Background mode until the next interrupt.
		+
		+	[[Picture Encoding\|This article]] describes how pictures are encoded in graphics memory (both [[Graphics RAM\|GRAM]] and GROM).

	==GROM Picture Catalog==		==GROM Picture Catalog==

@@ Line 17: / Line 17: @@
 The following table illustrates the ASCII character set, and how it corresponds to the first portion of the GROM.  Note that ASCII code #32 is the "space character".
-         ASCII CODES    GROM CARDS   ASCII CHARCTERS
+         ASCII CODES    GROM CARDS   ASCII CHARACTERS
          -----------    ----------   -------------------------------
 - 47        0 - 15       ! " # $ % & ' ( ) * + , - . /

@@ Line 4: / Line 4: @@
 The GROM actually implements three address decoding modes:
-* The CPU-access memory map.  GROM is visible at $3000 - $37FF, and GRAM is visible at $3800 - $3FFF
+* The CPU-access memory map.  GROM is visible at $3000 - $37FF, and [[Graphics RAM|GRAM]] is visible at $3800 - $3FFF
 * The display generation memory maps:
-** Color Stack mode:  GROM is visible at $0000 - $07FF.  GRAM is visible at $0800 - $0FFF.  Addresses are fully decoded.
+** Color Stack mode:  GROM is visible at $0000 - $07FF.  [[Graphics RAM|GRAM]] is visible at $0800 - $0FFF.  Addresses are fully decoded.
 ** Foreground/Background mode:  Same as Color Stack, except address bits 9 and 10 get ignored.  Thus, only the first 64 cards of GROM are available.  (GRAM only holds 64 cards, so there is no difference there.)
 The GROM uses the [[STIC]]'s [[VBlank Interrupt]] to switch to the CPU-access memory map.  The CPU's BUSAK signal switches the GROM back to the display-generation memory map.  The GROM looks at the BAR' and DWS' signals from the STIC to choose between Color Stack and Foreground/Background decoding.  If both of these signals pulse positive together, the GROM switches to Foreground/Background mode until the next interrupt.

@@ Line 1: / Line 1: @@
 [[Category:Memory Units]]
-The Graphics ROM (GROM) is an 2048 x 8-bit ROM, [[General Instruments|GI]] part number RO-3-9503.  The [[CP-1610]] sees GROM at addresses $3000-$37FF.  The Graphics ROM contains the default character set and is used by the [[STIC]] to render characters to the screen as directed by the program.  The Graphics ROM also includes decoding logic to allow the [[Graphics RAM]] to interface to the STIC.
+The Graphics ROM (GROM) is an 2048 x 8-bit ROM, [[General Instruments|GI]] part number RO-3-9503.  The [[CP1610]] sees GROM at addresses $3000-$37FF.  The Graphics ROM contains the default character set and is used by the [[STIC]] to render characters to the screen as directed by the program.  The Graphics ROM also includes decoding logic to allow the [[Graphics RAM]] to interface to the STIC.
 The GROM actually implements three address decoding modes:

← Older revision	Revision as of 08:24, 4 December 2010
(No difference)

← Older revision		Revision as of 01:06, 24 January 2005
Line 1:		Line 1:
	[[Category:Memory Units]]		[[Category:Memory Units]]
−	The Graphics ROM (GROM) is an 8-bit ROM ~~that is 2KB in size mapped into the Intellivision from~~ $3000-$37FF. The Graphics ROM contains the default character set and is used by the [[STIC]] to render characters to the screen as directed by the program. The Graphics ROM also includes decoding logic to allow the [[Graphics RAM]] to interface to the STIC.	+	The Graphics ROM (GROM) is an 2048 x 8-bit ROM, [[General Instruments\|GI]] part number RO-3-9503. The [[CP-1610]] sees GROM at addresses $3000-$37FF. The Graphics ROM contains the default character set and is used by the [[STIC]] to render characters to the screen as directed by the program. The Graphics ROM also includes decoding logic to allow the [[Graphics RAM]] to interface to the STIC.
		+
		+	The GROM actually implements three address decoding modes:
		+
		+	* The CPU-access memory map. GROM is visible at $3000 - $37FF, and GRAM is visible at $3800 - $3FFF
		+	* The display generation memory maps:
		+	** Color Stack mode: GROM is visible at $0000 - $07FF. GRAM is visible at $0800 - $0FFF. Addresses are fully decoded.
		+	** Foreground/Background mode: Same as Color Stack, except address bits 9 and 10 get ignored. Thus, only the first 64 cards of GROM are available. (GRAM only holds 64 cards, so there is no difference there.)
		+
		+	The GROM uses the [[STIC]]'s [[VBlank Interrupt]] to switch to the CPU-access memory map. The CPU's BUSAK signal switches the GROM back to the display-generation memory map. The GROM looks at the BAR' and DWS' signals from the STIC to choose between Color Stack and Foreground/Background decoding. If both of these signals pulse positive together, the GROM switches to Foreground/Background mode until the next interrupt.

← Older revision		Revision as of 22:18, 11 January 2005
Line 1:		Line 1:
	[[Category:Memory Units]]		[[Category:Memory Units]]
−	The Graphics ROM (GROM) is an 8-bit ROM that is 2KB in size mapped into the Intellivision from $3000-$37FF. The Graphics ROM contains the default character set and is used by the [[STIC]] to render characters to the screen as directed by the program.	+	The Graphics ROM (GROM) is an 8-bit ROM that is 2KB in size mapped into the Intellivision from $3000-$37FF. The Graphics ROM contains the default character set and is used by the [[STIC]] to render characters to the screen as directed by the program. The Graphics ROM also includes decoding logic to allow the [[Graphics RAM]] to interface to the STIC.

← Older revision		Revision as of 22:10, 11 January 2005
Line 1:		Line 1:
−	[[Category:Memory Units]	+	[[Category:Memory Units]]
	The Graphics ROM (GROM) is an 8-bit ROM that is 2KB in size mapped into the Intellivision from $3000-$37FF. The Graphics ROM contains the default character set and is used by the [[STIC]] to render characters to the screen as directed by the program.		The Graphics ROM (GROM) is an 8-bit ROM that is 2KB in size mapped into the Intellivision from $3000-$37FF. The Graphics ROM contains the default character set and is used by the [[STIC]] to render characters to the screen as directed by the program.

← Older revision		Revision as of 22:09, 11 January 2005
Line 1:		Line 1:
		+	[[Category:Memory Units]
	The Graphics ROM (GROM) is an 8-bit ROM that is 2KB in size mapped into the Intellivision from $3000-$37FF. The Graphics ROM contains the default character set and is used by the [[STIC]] to render characters to the screen as directed by the program.		The Graphics ROM (GROM) is an 8-bit ROM that is 2KB in size mapped into the Intellivision from $3000-$37FF. The Graphics ROM contains the default character set and is used by the [[STIC]] to render characters to the screen as directed by the program.