Bankset Bankswitching - Revision history

MSaarna at 14:31, 24 February 2023

2023-02-24T14:31:10Z

2023-02-22T04:01:28Z

2023-02-22T04:01:07Z

‎Working with Banksets

2023-02-08T15:52:34Z

‎Platforms Supporting Bankset Mappers

2022-12-30T00:07:13Z

2022-12-29T20:31:18Z

2022-03-21T22:10:52Z

2022-03-21T22:08:59Z

2022-03-21T22:02:40Z

2022-03-11T17:37:44Z

‎Sound

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 The Bankset bankswitching scheme is a 7800 homebrew-era invention. The Bankset scheme was created by Fred Quimby, in collaboration with Mike Saarna.
-Banksets is an extension of the Atari 7800 SuperGame bankswitch format. Similar to SuperGame, there's an ephemeral bank located at $8000-$BFFF, a non-ephemeral bank located at $C000-$FFFF, and hitting the hotspot at $8000 will change the ephemeral bank. Unlike SuperGame, Maria is shown a different section of ROM than the Sally CPU is, with each of these views comprising a different set of banks. Hence the "Banksets" name.
+Banksets is an extension of the Atari 7800 SuperGame bankswitch mapper. As with the plain SuperGame mapper, there's an ephemeral bank located at $8000-$BFFF, a non-ephemeral bank located at $C000-$FFFF, and hitting the hotspot at $8000 will change the ephemeral bank. Unlike SuperGame, Maria is shown a different section of ROM than the Sally CPU is, with each of these views comprising a different set of banks. Hence the "Banksets" name.
 Compared to SuperGame scheme, the Banksets scheme allows for more overall ROM storage, enables 100% of the cart address space to be dedicated to the display of graphics, and does away with the need to interlace code and graphics within ROM.

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 * Maria is unable to see any of Sally's ROM. This means any ROM-based character strings either need to be in Maria's bankset, or copied into console RAM prior to display.
 * Your DL must be stored in console ram, rather than bankset cart ram.
 == A78 header usage ==

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 * a bankswitch for Sally is also a bankswitch for Maria, so you still need to pay attention to where your code is running when Maria starts drawing the frame.
 * Maria is unable to see any of Sally's ROM. This means any ROM-based character strings either need to be in Maria's bankset, or copied into console RAM prior to display.
+* Your DL must be stored in console ram, rather than bankset cart ram.
 == A78 header usage ==

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 * a7800 emulator (PC: Windows, MacOS, Linux)
 * a7800ds emulator (Nintendo DS)
 The various 2x32k and 2x128k bankset mappers are supported by the MiSTer FPGA Atari 7800 core.

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 Due to timing constraints, execution from Sally's cart-ram isn't supported.
 ===Sound===
 For mappers with POKEY, POKEY@4000 is used when no writable device is covering the $4xxx address space, to minimise hardware logic requirements. When ROM already exists in the $4000 address space, the POKEY@4000 is write-only.
 ==The Bankset Test Suite==
 The [[Media:Bankset_Test_Suite_v1.zip|Bankset_Test_Suite_v1.zip]] package contains sample bankset roms, which can be used by developers to test their emulators or flash carts.
 ==Platforms Supporting Bankset Mappers==
 The bankset mappers are fully supported by:
 * a7800 emulator (PC: Windows, MacOS, Linux)

← Older revision		Revision as of 20:31, 29 December 2022
Line 63:		Line 63:
	==The Bankset Test Suite==		==The Bankset Test Suite==
	The [[Media:Bankset_Test_Suite_v1.zip\|Bankset_Test_Suite_v1.zip]] package contains sample bankset roms, which can be used by developers to test their emulators or flash carts.		The [[Media:Bankset_Test_Suite_v1.zip\|Bankset_Test_Suite_v1.zip]] package contains sample bankset roms, which can be used by developers to test their emulators or flash carts.
		+
		+	==Platforms Supporting Bankset Mappers==
		+	The bankset mappers are fully supported by:
		+	* a7800 emulator (PC: Windows, MacOS, Linux)
		+	* a7800ds emulator (Nintendo DS)
		+
		+	The various 2x32k and 2x128k bankset mappers are supported by the MiSTer FPGA Atari 7800 core.

← Older revision		Revision as of 22:08, 21 March 2022
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	===Sound===		===Sound===
	For mappers with POKEY, POKEY@4000 is used when no writable device is covering the $4xxx address space, to minimise hardware logic requirements. When ROM already exists in the $4000 address space, the POKEY@4000 is write-only.		For mappers with POKEY, POKEY@4000 is used when no writable device is covering the $4xxx address space, to minimise hardware logic requirements. When ROM already exists in the $4000 address space, the POKEY@4000 is write-only.
		+
		+	==Sample Roms==
		+	The [[Media:Bankset_Test_Suite_v1.zip\|Bankset_Test_Suite_v1.zip]] package contains sample bankset roms, which can be used by developers to test their emulators or flash carts.

@@ Line 27: / Line 27: @@
 == A78 header usage ==
-The header bits should describe the format used in each bankset. (e.g. SuperGame + Pokey@450) in addition to the bankset bit. (bit 13 of the "cart type" word) Bankset memory, if used, is exclusively the "banked ram" type. (bit 5 of the "cart type" word)
+The header bits should describe the format used in each bankset. (e.g. SuperGame + Pokey@800) in addition to the bankset bit. (bit 13 of the "cart type" word) Bankset memory, if used, is exclusively halt bank-switched RAM. (bit 14 of the "cart type" word)
@@ Line 35: / Line 35: @@
 * 2x32K ROM
-* 2x32K ROM + RAM@4000 + POKEY@450
+* 2x32K ROM + RAM@4000 + POKEY@800
 * 2x32K ROM + POKEY@4000
 * 2x48K ROM
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 * 2x128K ROM + BANK6@4000
 * 2x128K ROM + RAM@4000
-* 2x128K ROM + RAM@4000 + POKEY@450
+* 2x128K ROM + RAM@4000 + POKEY@800
 * 2x128K ROM + POKEY@4000

← Older revision		Revision as of 17:37, 11 March 2022
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	===Sound===		===Sound===
−	For mappers with POKEY, POKEY@4000 is used when no writable device is covering the $4xxx address space, to minimise hardware logic requirements. If ROM exists in the $4000 address space, the POKEY@4000 is write-only.	+	For mappers with POKEY, POKEY@4000 is used when no writable device is covering the $4xxx address space, to minimise hardware logic requirements. When ROM already exists in the $4000 address space, the POKEY@4000 is write-only.