Editing Amiga 500 (section)

== Amiga 500 Plus ==
{{Infobox computer
| image = Amiga 500 Plus (white background).jpg
| caption = Base of the Amiga 500 Plus, with the Italian variant of the keyboard
| name = Commodore Amiga 500 Plus
| developer = [[Commodore International]]
| family = [[Amiga]]
| type = [[Home computer]]
| release date = {{Start date and age|1991}} (UK)
| discontinued = 1992
| os = [[AmigaOS]] v2.04
| media = 880 [[kilobyte|KB]] floppy disks
| cpu = [[Motorola 68000]] @ {{nowrap|7.16 MHz ([[NTSC]])}}<br> {{nowrap|7.09 MHz ([[PAL]])}}
| memory = 1 [[megabyte|MB]] (10 [[megabyte|MB]] maximum)
| display = 640×256, 4 [[Color depth|bpp]] @ {{nowrap|50 [[Frame rate|Hz]] ([[PAL]])}}<br> 640×200, 4 [[Color depth|bpp]] @ {{nowrap|60 [[Frame rate|Hz]] ([[NTSC]])}}
| sound = 4× 8-bit channels PCM at max. {{nowrap|28 [[kHz]]}} with 6-bit volume in stereo
| predecessor = Amiga 500
| successor = [[Amiga 600]]
}}

The '''Amiga 500 Plus''' (often '''A500 Plus''' or simply '''A500+''') is a revised version of the original Amiga 500 computer. The A500+ featured minor changes to the motherboard to make it cheaper to produce than the original A500. It was notable for introducing new versions of [[Kickstart (Amiga)|Kickstart]] and [[AmigaOS|Workbench]], and for some minor improvements in the custom chips, known as the [[Enhanced Chip Set]] (or ECS).

Although officially introduced in 1992, some Amiga 500 units sold in late 1991 actually featured the revised motherboard used in the A500+. Although the Amiga 500+ was an improvement to the Amiga 500, it was minor. It was discontinued and replaced by the [[Amiga 600]] in summer 1992, making it the shortest-lived Amiga model.{{cn|date=February 2025}}

=== Compatibility problems ===
{{Unreferenced section|date=March 2021}}
Due to the new Kickstart v2.04, quite a few popular games (such as ''[[Treasure Island Dizzy]]'', ''[[Lotus Esprit Turbo Challenge]]'', and ''[[SWIV]]'') failed to work on the Amiga 500+, and some people took them back to dealers demanding an original [[Kickstart_(Amiga)|Kickstart]] 1.3 Amiga 500. This problem was largely solved by third parties who produced Kickstart [[Read-only memory|ROM]] switching boards, that could allow the Amiga 500+ to be downgraded to Kickstart 1.2 or 1.3. It also encouraged game developers to use better programming habits, which was important since Commodore already had plans for the introduction of the next-generation [[Amiga 1200]] computer. A program, Relokick, was also released (and included with an issue of [[CU Amiga]]) which loaded a [[Kickstart (Amiga)|Kickstart]] 1.3 [[ROM]] image into memory and booted the machine into Kickstart 1.3, allowing most incompatible software to run (the software did take up 512&nbsp;KB of system memory, meaning that some 1&nbsp;MB only games would now  fail for lack of available memory). In some cases, updated compatible versions of games were later released, such as budget versions of [[Lotus (video game series)|Lotus 1]] and [[SWIV]], and an update to ''[[Bubble Bobble]]''. [[Double Dragon 2]] by Binary Design received an update for [[Amiga Enhanced Chip Set|ECS]] machines with the "Amiga phase-alternated linescan version 4.01/ECS". This solved compatibility issues with the graphics which appeared garbled on ECS machines, and it also slashed the in-game loading times from around 20 seconds to just over 6.

=== Technical specifications ===
* [[Motorola 68000]] [[central processing unit|CPU]] running at {{nowrap|7.09 MHz}} (PAL) / {{nowrap|7.16 MHz}} (NTSC), like its predecessor
* 1 MB of [[Chip RAM]] (very early versions came with 512&nbsp;[[Kibibyte|KB]]<ref>{{Cite web |title=Amiga Beginners Series #2 - Amiga Models |url=https://www.amigaretro.com/index.php?page=5 |access-date=2024-07-13 |website=www.amigaretro.com |archive-date=July 13, 2024 |archive-url=https://web.archive.org/web/20240713163205/https://www.amigaretro.com/index.php?page=5 |url-status=live }}</ref>)
* Kickstart 2.04 (v37.175)
* Workbench 37.67 (release 2.04)
* Built-in battery backed RTC (Real Time Clock)
* Full [[Enhanced Chip Set|ECS]] chipset including new version of the [[MOS Technology Agnus|Agnus]] chip and [[Original Amiga chipset#Denise|Denise]] chip