Switch on your Amiga and initiate the ACA500 Plus boot menu.On your PC or Mac copy the kick.a500.46.143 rom to your AUX Cf Card and plug in to to your ACA500Plus.Using MapRom to map the 3.1.4 Rom on the ACA500Plus. You will only need to do this if the flash ROM has been garbled – in that case, the bootable floppy will serve as a recovery-disk. *The unpacked file is an ADF image that can also be written to a floppy disk. Follow the instructions on screen to install the update.The Amiga will boot into Shell and read the ADF file on the AUX CF card.Press F8 and then F to launch the flash updater.Once complete Insert the CF card into the AUX slot of your ACA500Plus, then launch the ACA500Plus menu.Once downloaded, unzip it on to a CF card, one that can be used in the AUX slot of your ACA500Plus.Download the update from iComp here Menu System v0.127.I do recommended that you upgrade your ACA500Plus Menu System (currently v0.1). A workbench boot disk (I’m using a 3.0 Workbench disk).A CF card (any size) to be used in an AUX slot, mine is named ‘USB’.Downloaded 3.1.4 Rom file ‘kick.a500.46.143’ (this is part of the AmigaOS purchase).Have purchased AmigaOS 3.1.4, you can do so from Hyperion here.Of course you could purchase an EPROM burning service that will burn the 3.1.4 kickstart rom to an EPROM chip but where is the fun in that? If you have an ACA Accelerator you can use the ACAMapROM software to map a rom also. 1MByte images must start at slot numbers 1 or 5. Each slot is 256kb, so a 512kb image will occupy two slots (2 x 256kb = 512kb), and must start at an odd slot number. The ACA500 Plus has 8 slots and supports 256kb, 512kb and 1MByte roms. For example of you have a 3.0 Rom, you can use the MapRom feature to load a 3.1 Rom instead without changing your roms! The MapRom feature allows you to load a Kickstart Rom that is beyond what is physically installed in your Amiga. The ACA500 Plus like the ACA1221EC, ACA1233 and many of the previous ACA cards, in fact many classic Amiga accelerators have this function. I have also married this up with an ACA1221EC to give me a bit more speed (this has a 68020 processor) however it is not required for AmigaOS 3.1.4 or needed for this guide. This guide however for my setup which is an Amiga 500 Plus, with 2mb of chipram with an ACA500Plus. This guide I hope will help others and may fill in some gaps if using other accelerators that have the MapRom function.

A500 kickstart 1.3 rom download