Early A3000 models were, like the A1000, also shipped with Kickstart on floppy disk, and used a 1.4 BETA ROM as bootstrap. Either Kickstart 1.3 or 2.0 could be extracted to a partition specifically named WB_1.3 or WB_2.x, respectively, and put in DEVS:kickstart, an absolute system location from where the A3000 system will find it at bootstrap and copy its image into RAM. This early A3000 supported both ROM based Kickstarts and disk-based Kickstarts, although not simultaneously. An A3000 configured to use disk-based Kickstart images had the benefit of being able to boot various versions of AmigaOS without additional tools, simply by selecting the appropriate Kickstart image at boot time.

Just like real Amiga computers, Amiga emulators (such as WinUAE and WinFellow) need Amiga Kickstart ROM files in order to boot AmigaOS. Different Amiga models use different versions of the kickstart ROM.


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Also, there's a vid out there (I don't think it's on youtube, my amiga.org or the German Amiga 1000 site??) of someone (I think his username was ratte) who took an Amiga 3.x kickstart ROM, removed things the A1000 didn't need, added a decompressor, compresses everything he could and kicked 3.x on an Amiga 1000. It was only a "for fun" demo tho, as my understanding was, it took AGES. The video was sped up..

My favorite is "kickwork." Basically, a kickstart ROM is only 256k. The floppy is 800k. There's a lot of space left. So Piru at Amiga.org wrote a program that patches the trackdisk (floppy driver) to allow you to use the "rest of the space" on the disk as a WB floppy.

As for games/apps for the Amiga, the only programs I am aware of that "used" kickstart RAM in anyway were Dragon's Lair (You needed a 1M Amiga (newer models) OR a 512k Amiga 1000 and it would use the kickstart space for memory) or A-Max, the Macintosh emulator (also by the same people who did Dragon's Lair) could use the kickstart area for Mac RAM.

In reality there is not such a neat division as in the PC world, where BIOS and OS are competely divided, just in oldish Macintosh, part of the OS is actually in the ROM (kickstart) and partially in the diskettes (Workbench).

Once the kickstart asks for a diskette, if you have a bootable diskette (including a game one) it should boot allright, but it is possible that either the diskette or the drive is dirty, damaged or both.

Anyway, just wanted to throw in that if your model is Amiga 500+, the one with built-in 1mb instead of 512kb and kikstart 2.0 instead of 1.3, then many games didn't worked, as they werent compatible with kickstart 2.0 and hence, instead of adding a kickstart switcher + kickstart 1.3 in hardware, then there where a floppy-disk that could be loaded before the game which then stayed resident in RAM and would run a big number of the kickstart 1.3 only games...

Finally I made a be line for Retro EZ who I was really happy to see selling the new bluetooth/RF Tank Mouse that had been made via a kickstarter that I missed out on, I played around with the Tank mouse you got with the A500 mini and did surprise me how holding a classic mouse made me feel like I step back in time, so this was a really nice treat and this will now be the mouse I use now with my Pi400 Amikit system.

Starting with kickstart 2.0, the ROM size is 512kiB. The 1.x series was 256kiB. A utility written when only 1.x existed will probably only write out the upper 256kiB of a 512kiB kickstart. Even if you have the whole 512kiB on disk, A1000 would only load 256kiB anyway.

The Amiga kernel consists of a number of system modules, some of which reside permanently in the protected kickstart memory and others that are loaded as needed from the system disk. At the top of the hierarchy are Workbench and the Command Line Interface (CLI), the user-visible portions of the system. Workbench uses Intuition to produce its displays and AmigaDOS to interact with the filing system. Intuition, in turn, uses the input device to retrieve its input and the graphics and layers library routines to produce its output.

You will need a copy of the Kickstart ROM and Workbench disk images, version 3.0 or 3.1. This is still under copyright, and at least the Workbench images can be bought from amigaforever.com. They can also be found on several places on the Internet, as usual DuckDuckGo is your friend.

As Amiga development progressed newer versions of the kickstart roms were released. These were tied in with each version of Workbench, with each version of Workbench requiring the same version of kickstart roms in the system for it to work.

The very first Amiga released in 1985, the Amiga A1000, came with Kickstart version 1.0, but this Amiga didn't have this on rom chips, instead booted the code into memory from a Kickstart floppy disk. You needed to do this every time you rebooted the system and then swap the disk for one with the actual software you wished to run, such as the Workbench OS disk or a game. This did have the advantage of allowing newer kickstart versions to be easily used on the system by obtaining the latest version. But having to load it from floppy disk every time was tiresome after a while.

After the A1000 came the A2000, and this was the first to have the kickstart files loaded onto rom chips. This meant that you didn't first need to boot up a kickstart disk, but could instead stick a software disk into the drive and switch on the system to boot directly into the software, making life much easier. The A2000 first came with Kickstart 1.2, and was later updated with Kickstart 1.3.

After the A500 came the A3000. This was similar to the A1000 in that it also didn't have actual kickstart roms, but this time the Kickstart was loaded from the internal Harddrive. This was by far the best design as it meant different kickstart versions could be swapped very easily with a software update. The A3000 was the first Amiga is use an updated version of the Amiga's custom chipset, called the Enhanced Chip Set (or ECS for short) and this came with kickstart 2.04, which was a huge upgrade over the older 1.X versions, and with it Workbench 2, which also improved the Amiga OS greatly.

In general most games that ran on an A500 with kickstart 1.3 would also work on a system with kickstart 2.04 roms. But some older titles didn't work due to changes in the custom chip set and the kickstart roms.

After the A3000 came the A500 Plus. This looked the same as the A500 but had the same enhanced ECS chipset as the A3000, but with the kickstart 2.04 roms now loaded from rom chips. This replaced the original A500 and was as popular.

Next the A600 replaced the A500 Plus. Nearly identical in hardware with the same ECS chipset, and a slightly updated kickstart 2.05 which added support for IDE harddrives and PCMCIA cards. The kickstart 2.04 and 2.05 versions are nearly identical so anything running on one should run on the other.

After this the A4000's little brother, the A1200 was released, using the same kickstart and AGA chipset and sharing the same compatibility issues. But the benefits of the new AGA chipset and kickstart 3 roms greatly out weighed the compatibility issues.

Finally we have Kickstart 3.1. This was a big update to kickstart 3.0 code which fixed many bugs in the original 3.0 roms, but in use not much was actually noticeably different. The newer A1200's and A4000's made had these roms as standard but the older 3.0 based AGA Amigas needed to be upgraded. The 3.1 roms were also included as standard in the CD32. And the 3.1 roms still remain the newest version available.

Kickstart Revisions: Different kickstart revisions exist for each version of Kickstart ROM. Newer revisions fix bugs and missing code. For example the earliest A600 2.05 rom, revision 37.299, was missing all support for the IDE and PCMCIA ports. Some revisions of a rom may only work in a specific Amiga model to support unique hardware features.

As newer versions of the Amiga kickstart roms and the associated Workkbench OS versions were released, the ability to upgrade the older models of Amiga to the latest version of kickstart and Workbench were offered for more models.

With the A1000 and A3000 this just involved getting hold of the newer kickstart on floppy disk, but for all other Amiga models this required a new set of Kickstart rom chips. These are socket mounted on the Amiga motherboard, as shown in the picture to the right, and are not hard to change. Just open up the Amiga case, remove the existing chips, and insert the new ones.

Therefore any Amiga can be updated to run a newer version of kickstart rom and related Workbench OS version (The A1000 didn't see versions of Kickstart from 2 onwards due to hardware limitations). So you could for example update an Amiga A500 to kickstart 3 and run Workbench 3 on it.

Upgrading older Amiga models with newer kickstart versions means being able to run the newer version of Workbench and therefore all the applications and utilities written for it. But you do have to remember that the rest of the hardware in the system will remain the same, so features of a newer version of Workbench that require the features of a newer custom chipset will still be missing. For example higher colour modes on the A1200 would be missing when Workbench 3 is running on an A500 with an older chipset. It also means that for example a game written fro Kickstart 3 Amiga's, but utilising the A1200's AGA chipset will not run on an A500 with the kickstart 3 roms, because the rest of the A500 will still be the same as it was before, with the Original Chip Set (OCS). e24fc04721

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