Harms Professional 030 Plus

: Accelerator
Amiga: A500

CPU: 68030 @ 20 MHz
FPU: 68882 @ 25 MHz
Memory: 4 MB

  • on-board 68000 CPU for fallback mode
  • memory does not autoconfig


The first accelerator I ever bought for my A500 was a Harms Professional 030 Plus. I found it listed on a classified ads site in the Netherlands. This particular model was first released in 1992 and was manufactured by Harms Computertechnik in Germany. It was the successor to the previously released Harms Professional 020 and 030 accelerator boards and seems to be the last A500 accelerator released by Harms.

Harms 1.jpgHarms 2.jpgHarms 3.jpg

According to the manual it was released with a 68030 CPU clocked at 14 MHz although my board has a 20 MHz 68030 installed. It comes standard with a 68882 FPU and mine is clocked at 25 MHz. The board is installed internally by removing the original 68000 CPU and fitting the board inside the A500's CPU socket. There's a 68000 socket on the accelerator which allows the original 68000 CPU to be fitted, although mine seems to be surface mounted (i.e. soldered to the board). A jumper allows you to switch between the 68030 and the 68000 CPU for compatibility with older software that won't run properly on the 68030. Another improvement over the older accelerators was the fact that memory could be fitted on the card without the use of an additional daughterboard. The Harms Professional 030 Plus has room for 16 ZIP RAM chips allowing various memory configurations from 1 to 8 MB. I got the board with 4 MB of memory installed. I've bought 4 MB of extra memory but never got it to work. I suspect the ZIP chips I bought are faulty. Unfortunately the onboard memory doesn't autoconfig, which means it has to be added manually during startup using the AddMem command. 

Harms installed 1.jpgHarms installed 2.jpg

I have used this board for several months and it was very stable. I didn't expect that much of a speed increase as accelerator upgrades only upgrade the CPU. The Amiga has lots more custom chips that handle various other tasks likes video and audio, that still run at their original clock speed, offloading the CPU. This means graphics won't draw any faster per se, but I did notice a speed increase in window redraws in Workbench. My A500 definitely felt more responsive and ofcourse the speed increase is instantly noticed when unpacking archive files and other computationally intensive stuff.

NOTE: I do not own this accelerator anymore. I will leave this page up for reference.

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