Jumper settings
During the evolution of the ATW800/2 the jumpers on the card were sometime (re)used in a different way depending on the card-revision and installed CPLD firmware. This was done to guarantee backwards compatibility for earlier card revisions when upgraded with a newer firmware.
The Mk3 V1.1 PCB introduced an additional jumper which can only be used when plugged into a Mega-ST. Here's a list of the jumper settings depending on the card and firmware version.
Please mind that jumpers are populated or not populated based on the bus version of your card (Mega-ST or VME bus). Refer to the manual for the location of the jumpers.
Mk3 v1.0[a|b|c] - 1.1
Mega ST
CPLD Firmware V0
- A0/A1 - used for setting the IDE controller base address
- IDE - Closed: Enable IDE, Open: Disable IDE
CPLD Firmware V1
- A0/A1 - used for setting the VRAM base address.
Introduced with FPGA firmware V0205 which supports 4MB VRAM (24bit colour). - IDE - Closed: Enable IDE, Open: Disable IDE
TT / Mega-STe
CPLD Firmware V0
- A0/A1 - not used
- IDE - not used
- ADDR - Selects Atari Model. Closed: Mega-STE, Open: TT
CPLD Firmware V1
- A0/A1 - not used
- IDE - Closed: Enable IDE, Open: Disable IDE
Only works with HDDRIVER 12.6 or later. - ADDR - Selects Atari Model. Closed: Mega-STE, Open: TT
CPLD Firmware V2
- A0/A1 - used for setting the VRAM base address.
Introduced with FPGA firmware V0205 which supports 4MB VRAM (24bit colour). - IDE - Closed: Enable IDE, Open: Disable IDE
Only works with HDDRIVER 12.6 or later. - ADDR - Selects Atari Model. Closed: Mega-STE, Open: TT
For the Mega-STE you also need to set the A0/A1 for the VRAM base of 0xA00000!
Mk3 v1.1a
The version 1.1a was already shipped with the then latest CPLD and FPGA firmware. So the minimum firmware releases are covered here.
Mega ST
CPLD Firmware V1
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TT / Mega-STe
CPLD Firmware V2
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