Speccy Port - Revision history

Polluks: /* Arcade hits */

2026-05-10T11:19:14Z

Arcade hits

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	*Double Dragon 3		*Double Dragon 3
	*Super Hang-On		*Super Hang-On
	*Enduro Racer		*[[Enduro Racer]]
	*Toobin'		*Toobin'
	*Xybots		*Xybots

Polluks: /* Rushed and Lazy */

2026-05-10T11:16:47Z

Rushed and Lazy

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	*'''Sabrina''' : same as Bionic commando		*'''Sabrina''' : same as Bionic commando
	*'''Gauntlet 3''' : HUD is properly recolored (3 shades) but in-game window is monochrome (1bit coded sprites and tiles)		*'''Gauntlet 3''' : HUD is properly recolored (3 shades) but in-game window is monochrome (1bit coded sprites and tiles)
	*'''R-~~type~~''' : Monochrome background while sprites still are "coloured" as with Colour attributes, hence even featuring less colours than original Spectrum game, while the entire screen still displays more than the only 4 Mode1 colours...(HUD raster trick). This game was done in 3 weeks by only one man, who simply emulated the speccy stuff on CPC. Given that the Spectrum game was a great release the CPC port is not too bad.		*'''[[R-Type]]''' : Monochrome background while sprites still are "coloured" as with Colour attributes, hence even featuring less colours than original Spectrum game, while the entire screen still displays more than the only 4 Mode1 colours...(HUD raster trick). This game was done in 3 weeks by only one man, who simply emulated the speccy stuff on CPC. Given that the Spectrum game was a great release the CPC port is not too bad.

	An special mention must go for '''Mevlut "Speccy" Dinc''', one of the worst offenders with nightmares as '''Big Trouble In Little China''', '''Enduro Racer''', '''Hammerfist''', '''Knightmare''', '''Last Ninja 2''', '''Last Ninja 2 Remix''', '''Prodigy''', '''Super Hang-On''' and '''Time Machine'''.		An special mention must go for '''Mevlut "Speccy" Dinc''', one of the worst offenders with nightmares as '''Big Trouble In Little China''', '''Enduro Racer''', '''Hammerfist''', '''Knightmare''', '''Last Ninja 2''', '''Last Ninja 2 Remix''', '''Prodigy''', '''Super Hang-On''' and '''Time Machine'''.

Polluks: /* Lists of speccy ports */

2026-04-06T22:02:49Z

Lists of speccy ports

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	Note: these lists are by no means comprehensive, they just include the most high-profile releases.		Note: these lists are by no means comprehensive, they just include the most high-profile releases.

	* [[Mayhem]] - [[https://www.cpc-power.com/index.php?page=detail&num=18884]] A recent Speccy port to CPC and PCW done by a single person. Read the document to see the comparison, issues encountered, choices made, read about the journey.		* [[Mayhem]] - [https://www.cpc-power.com/index.php?page=detail&num=18884] A recent Speccy port to CPC and PCW done by a single person. Read the document to see the comparison, issues encountered, choices made, read about the journey.

	=='''Computer originals Hits'''==		=='''Computer originals Hits'''==

Typhon at 18:41, 13 December 2023

2023-12-13T18:41:30Z

← Older revision		Revision as of 18:41, 13 December 2023
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	It is worth noting that Spectrum ports also existed on [[MSX]], [[Enterprise]] 64/128, [[SAM Coupé]] and non-[[Z80]] [[Thomson]] MO/TO, [[Commodore 64\|C64]].		It is worth noting that Spectrum ports also existed on [[MSX]], [[Enterprise]] 64/128, [[SAM Coupé]] and non-[[Z80]] [[Thomson]] MO/TO, [[Commodore 64\|C64]].

			==List of Spectrum Ports==
			[[List of Speccy Ports]]

	==How these should have looked==		==How these should have looked==

Arnoldemu: /* Original consequences (under construction) */

2023-04-02T15:13:42Z

Original consequences (under construction)

← Older revision		Revision as of 15:13, 2 April 2023
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	- If you are not using a custom disc or tape loader then during loading you will need to preserve the firmware memory regions. The easiest thing to do is start the game lower in memory (&0040), use the default screen at &c000-&ffff, and then once loaded copy data over these areas (provided you are not doing furthur loading/saving).		- If you are not using a custom disc or tape loader then during loading you will need to preserve the firmware memory regions. The easiest thing to do is start the game lower in memory (&0040), use the default screen at &c000-&ffff, and then once loaded copy data over these areas (provided you are not doing furthur loading/saving).

	===Original consequences (under construction)===		==Original consequences (under construction)==

	The Amstrad CPC was one of the best 8-bit computers of its time in terms of graphical capabilities. But those advanced capabilities had an impact on CPU resources.		The Amstrad CPC was one of the best 8-bit computers of its time in terms of graphical capabilities. But those advanced capabilities had an impact on CPU resources.

Arnoldemu: /* Memory arrangement */

2023-04-02T15:13:02Z

Memory arrangement

← Older revision		Revision as of 15:13, 2 April 2023
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	Where possible the Spectrum and Amstrad versions should use the same random number generation based on a stored seed.		Where possible the Spectrum and Amstrad versions should use the same random number generation based on a stored seed.

	===Memory arrangement===		==Memory arrangement==

	Spectrum game's often use the memory from &5500-&ffff.		Spectrum game's often use the memory from &5500-&ffff.
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	- If you are not using a custom disc or tape loader then during loading you will need to preserve the firmware memory regions. The easiest thing to do is start the game lower in memory (&0040), use the default screen at &c000-&ffff, and then once loaded copy data over these areas (provided you are not doing furthur loading/saving).		- If you are not using a custom disc or tape loader then during loading you will need to preserve the firmware memory regions. The easiest thing to do is start the game lower in memory (&0040), use the default screen at &c000-&ffff, and then once loaded copy data over these areas (provided you are not doing furthur loading/saving).

	====Original consequences (under construction)====		===Original consequences (under construction)===

	The Amstrad CPC was one of the best 8-bit computers of its time in terms of graphical capabilities. But those advanced capabilities had an impact on CPU resources.		The Amstrad CPC was one of the best 8-bit computers of its time in terms of graphical capabilities. But those advanced capabilities had an impact on CPU resources.

Arnoldemu: /* Random numbers */

2023-04-02T15:12:50Z

Random numbers

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	* For a smaller screen less memory is used for the screen (16KB vs 12K). The memory used by the screen is the same regardless of CPC mode used. Unused areas can be used to store graphics, code and music. For a CPC screen at &c000, the unused areas are: c600-c7ff, ce00-cfff, d600-d7ff, de00-dfff, e600-e7ff, ee00-efff, f600-f7ff, fe00-ffff		* For a smaller screen less memory is used for the screen (16KB vs 12K). The memory used by the screen is the same regardless of CPC mode used. Unused areas can be used to store graphics, code and music. For a CPC screen at &c000, the unused areas are: c600-c7ff, ce00-cfff, d600-d7ff, de00-dfff, e600-e7ff, ee00-efff, f600-f7ff, fe00-ffff

	===Random numbers===		==Random numbers==

	Sometimes Spectrum games generate random numbers by reading from the Spectrum's ROM which is always readable in the memory range &0000-&3fff.		Sometimes Spectrum games generate random numbers by reading from the Spectrum's ROM which is always readable in the memory range &0000-&3fff.

Arnoldemu: /* Screen dimensions */

2023-04-02T15:12:42Z

Screen dimensions

← Older revision		Revision as of 15:12, 2 April 2023
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	TODO:		TODO:

	===Screen dimensions===		==Screen dimensions==

	By setting CRTC register settings the Amstrad's screen dimensions can be reprogrammed to match the Spectrum's.		By setting CRTC register settings the Amstrad's screen dimensions can be reprogrammed to match the Spectrum's.

Arnoldemu: /* Mode 1 */

2023-04-02T15:12:35Z

Mode 1

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	This (the larger border) led to the false argument that the CPC's resolution was inferior to the Spectrum one although the amount of pixels on the screen is EXACTLY the same.		This (the larger border) led to the false argument that the CPC's resolution was inferior to the Spectrum one although the amount of pixels on the screen is EXACTLY the same.

			====Double buffering====

			TODO:

	===Screen dimensions===		===Screen dimensions===

Arnoldemu: /* Double buffering */

2023-04-02T15:12:10Z

Double buffering

← Older revision		Revision as of 15:12, 2 April 2023
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	Where possible the Spectrum and Amstrad versions should use the same random number generation based on a stored seed.		Where possible the Spectrum and Amstrad versions should use the same random number generation based on a stored seed.

	~~====Double buffering====~~

	~~TODO:~~

	===Memory arrangement===		===Memory arrangement===