Standard Memory Expansions - Revision history

Phi2x: /* Extended-Standard Expansions */

2025-02-24T16:38:25Z

Extended-Standard Expansions

← Older revision		Revision as of 16:38, 24 February 2025
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	* [[Gemini]] (Shinra - PulkoTronics) - compatible with standard 512 Kbyte expansion (plus extra extended-standard 512 Kbyte), also handles special case for Amstrad Plus ASIC		* [[Gemini]] (Shinra - PulkoTronics) - compatible with standard 512 Kbyte expansion (plus extra extended-standard 512 Kbyte), also handles special case for Amstrad Plus ASIC
			* [[Y-MEM]]
	* [[RAM7 2MB memory expansion]] ([[RAM7]]) - compatible with standard 512 Kbyte expansion (plus extra extended-standard 1.5 MBbyte)		* [[RAM7 2MB memory expansion]] ([[RAM7]]) - compatible with standard 512 Kbyte expansion (plus extra extended-standard 1.5 MBbyte)
	* [[CPC4MB]] ([[Yarek]]) (DIY) - compatible with standard 512 Kbyte expansion (plus extra extended-standard 3.5 MBbyte)		* [[CPC4MB]] ([[Yarek]]) (DIY) - compatible with standard 512 Kbyte expansion (plus extra extended-standard 3.5 MBbyte)

Phi2x: /* Non-Standard Expansions */

2025-02-24T10:47:28Z

Non-Standard Expansions

← Older revision		Revision as of 10:47, 24 February 2025
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	* [[Otten & Fecht 1 MB RAM-Disc]] - Accessed through I/O ports (RAM is not mapped to memory)		* [[Otten & Fecht 1 MB RAM-Disc]] - Accessed through I/O ports (RAM is not mapped to memory)
	* [[Vortex Expansions RAM card]] - an older expansion, uses 32K-banks, not compatible with the later standard		* [[Vortex Expansions RAM card]] - an older expansion, uses 32K-banks, not compatible with the later standard
	* [[Nova]] Non-volatile 32KB RAM and RTC		* [[Nova]] - Non-volatile 32KB RAM and RTC

	== Expansions that are unknown how they work, and if they are standard or not ==		== Expansions that are unknown how they work, and if they are standard or not ==

Phi2x: /* Non-Standard Expansions */

2025-02-16T15:33:10Z

Non-Standard Expansions

← Older revision		Revision as of 15:33, 16 February 2025
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	* [[Otten & Fecht 1 MB RAM-Disc]] - Accessed through I/O ports (RAM is not mapped to memory)		* [[Otten & Fecht 1 MB RAM-Disc]] - Accessed through I/O ports (RAM is not mapped to memory)
	* [[Vortex Expansions RAM card]] - an older expansion, uses 32K-banks, not compatible with the later standard		* [[Vortex Expansions RAM card]] - an older expansion, uses 32K-banks, not compatible with the later standard
			* [[Nova]] Non-volatile 32KB RAM and RTC

	== Expansions that are unknown how they work, and if they are standard or not ==		== Expansions that are unknown how they work, and if they are standard or not ==

Eto: /* Extended 1M-4M Expansions (RAM7/Yarek-style) */

2025-01-11T13:52:06Z

Extended 1M-4M Expansions (RAM7/Yarek-style)

← Older revision		Revision as of 13:52, 11 January 2025
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	(*) For example 7B01h or 7B7Fh would be no good, because the FDC command register at FB7Fh is mirrored to these locations. Using 7B80h..7BFFh would fix that problem, but might conflict with other connected expansion hardware.		(*) For example 7B01h or 7B7Fh would be no good, because the FDC command register at FB7Fh is mirrored to these locations. Using 7B80h..7BFFh would fix that problem, but might conflict with other connected expansion hardware.

	* '''Compatibility''' - The first 512K (Port 7Fxxh) are fully compatible with dk'tronics. Using the next 1.5MB (Port 7Exxh,7Dxxh,7Cxxh) should work without conflicting with the other hardware expansions.		* '''Compatibility''' - The first 512K (Port 7Fxxh) are fully compatible with dk'tronics. Using the next 1.5MB (Port 7Exxh,7Dxxh,7Cxxh) should similarly work without conflicting with the other hardware expansions.

	* '''Compatibility Problems''' - The ~~last~~ 2MB (Port 7Bxxh,7Axxh,79xxh,78xxh) can conflict with other hardware. ~~As workaround: Either leave them unused, or~~ use values for "xx" that do not conflict with your hardware (which values are good for "xx" and which aren't good depends on what other hardware you have connected) ~~(and obviously~~, ~~different "xx" may~~ be ~~needed in 7Bxxh~~ as ~~in 7Axxh, for example~~).		* '''Compatibility Problems''' - The upper 2MB (Port 7Bxxh,7Axxh,79xxh,78xxh) of a 4MB expansion can conflict with other hardware as setting A10 to 0 is also used for many hardware expansions. If those hardware expansions do not check A15 (and most don't) they might get activated if a RAM bank in the range 2-4MB is accessed. If you need to use RAM in that range make sure to use values for "xx" that do not conflict with your hardware (which values are good for "xx" and which aren't good depends on what other hardware you have connected). If unsure use &FF for xx as no custom hardware expansion should react if all bits of the lower byte are set. So e.g. OUT &78FF,&C4 or OUT &7AFF,&C5 should always be fine whereas OUT &7800,&C4 or OUT &7AC5,&C5 (as happening sometimes with speed optimised code) might unexpectedly turn on a feature on an expansion.

	== Capacity ==		== Capacity ==

Eto: /* Standard Expansions */

2024-12-28T21:24:36Z

Standard Expansions

← Older revision		Revision as of 21:24, 28 December 2024
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	* [[X-MEM]]		* [[X-MEM]]
	* [[Old_School_512K_RAM_Expansion]]		* [[Old_School_512K_RAM_Expansion]]
	* [[~~CPC_6320_-_internal_320K_for_CPC_6128\|~~CPC 6320 - internal 320K for CPC 6128]]		* [[CPC 6320 / CPC 6512 - internal 320K / 512K for CPC 6128]] (eto) - replacement of original RAM ICs

	== Extended-Standard Expansions ==		== Extended-Standard Expansions ==

Eto: /* Extended-Standard Expansions */

2024-12-28T21:22:21Z

Extended-Standard Expansions

← Older revision		Revision as of 21:22, 28 December 2024
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	* [[RAM7 2MB memory expansion]] ([[RAM7]]) - compatible with standard 512 Kbyte expansion (plus extra extended-standard 1.5 MBbyte)		* [[RAM7 2MB memory expansion]] ([[RAM7]]) - compatible with standard 512 Kbyte expansion (plus extra extended-standard 1.5 MBbyte)
	* [[CPC4MB]] ([[Yarek]]) (DIY) - compatible with standard 512 Kbyte expansion (plus extra extended-standard 3.5 MBbyte)		* [[CPC4MB]] ([[Yarek]]) (DIY) - compatible with standard 512 Kbyte expansion (plus extra extended-standard 3.5 MBbyte)
			* [[CPC iRAM]] (eto) DIY - compatible with standard 512K expansion (plus up to 512K extended-standard )

	== Semi-Standard Expansions ==		== Semi-Standard Expansions ==

Eto at 22:39, 9 November 2022

2022-11-09T22:39:49Z

← Older revision		Revision as of 22:39, 9 November 2022
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	* [[X-MEM]]		* [[X-MEM]]
	* [[Old_School_512K_RAM_Expansion]]		* [[Old_School_512K_RAM_Expansion]]
	* [[CPC_6320_-_internal_320K_for_CPC_6128]]		* [[CPC_6320_-_internal_320K_for_CPC_6128\|CPC 6320 - internal 320K for CPC 6128]]

	== Extended-Standard Expansions ==		== Extended-Standard Expansions ==

Eto at 22:38, 9 November 2022

2022-11-09T22:38:49Z

← Older revision		Revision as of 22:38, 9 November 2022
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	* [[X-MEM]]		* [[X-MEM]]
	* [[Old_School_512K_RAM_Expansion]]		* [[Old_School_512K_RAM_Expansion]]
			* [[CPC_6320_-_internal_320K_for_CPC_6128]]

	== Extended-Standard Expansions ==		== Extended-Standard Expansions ==

PulkoMandy: /* Extended-Standard Expansions */

2022-10-16T09:40:23Z

Extended-Standard Expansions

← Older revision		Revision as of 09:40, 16 October 2022
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	== Extended-Standard Expansions ==		== Extended-Standard Expansions ==

			* [[Gemini]] (Shinra - PulkoTronics) - compatible with standard 512 Kbyte expansion (plus extra extended-standard 512 Kbyte), also handles special case for Amstrad Plus ASIC
	* [[RAM7 2MB memory expansion]] ([[RAM7]]) - compatible with standard 512 Kbyte expansion (plus extra extended-standard 1.5 MBbyte)		* [[RAM7 2MB memory expansion]] ([[RAM7]]) - compatible with standard 512 Kbyte expansion (plus extra extended-standard 1.5 MBbyte)
	* [[CPC4MB]] ([[Yarek]]) (DIY) - compatible with standard 512 Kbyte expansion (plus extra extended-standard 3.5 MBbyte)		* [[CPC4MB]] ([[Yarek]]) (DIY) - compatible with standard 512 Kbyte expansion (plus extra extended-standard 3.5 MBbyte)

Revaldinho: Add Old School RAM expansion to standard expansion page

2018-10-26T14:53:33Z

Add Old School RAM expansion to standard expansion page

← Older revision		Revision as of 14:53, 26 October 2018
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	* [[SYMBiFACE II]] - includes (among others) 512K RAM expansion		* [[SYMBiFACE II]] - includes (among others) 512K RAM expansion
	* [[X-MEM]]		* [[X-MEM]]
			* [[Old_School_512K_RAM_Expansion]]

	== Extended-Standard Expansions ==		== Extended-Standard Expansions ==