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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: pan1k on May 17, 2009, 03:04:03 AM
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Trying to get the A2630 to work . . when inserted now, I get a blue screen. Could the DKB megachip be conflicting with the 2630 somehow? Blue screen means custom chip problem right?
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In case you have no manual?
Plug in your A2000 and peripherals and turn the power on.
Hold down both mouse buttons. The A2630 will present you
with a screen of boot-up options.
AmigaDOS on 68000
AmigaDOS on 68030
Amiga UX
Release both mouse buttons. Move the cursor to the box next to your selection and click either mouse button to make the selection. If you choose AmigaDOS on 68000, the accelerator card is disabled, and the system runs off the 68000 CPU. This option is not applicable for machines with a 4-layer motherboard since the 68000 CPU must be removed in order to install the A2630. If you choose this option with the 68000 CPU removed, you will experience system failure.
If you choose AmigaDOS on 68030, the system runs off the accelerator card’s 68030 CPU. This is the default option when you power on or reset the Amiga with the A2630 accelerator card installed.
If you choose Amiga UX, a UNIX operating system is invoked (provided you have the proper hardware/software installed and have set a jumper on J304).
Compatibility and Testing
As soon as the Amiga is turned on or comes out of reset, the A2630 takes over from the 68000. The 32-bit on-card memory will show up as normally auto-configured memory, and it will always be the first memory to be auto-configured by the operating system. You may want to run the FastMemFirst program early in the startup sequence. This will insure that the 32-bit memory on the A2630 card is the first FAST memory to be used by any application. The A2630 card, in addition to increasing the speed in a 32-bit
environment, must also access the 16-bit hardware bus system of the Amiga 2000. The 68030 CPU has a built-in dynamic bus sizing feature which adjusts memory cycles to any system resource that it addresses. On the A2630 card, logic tells the 68030 chip that its on-board memory is 32 bits wide, while any normal system resources like CHIP RAM, CHIP registers, or expansion devices, are 16 bits wide. While the 68030 is running at 25 MHz for internal and 32-bit wide operations, A2000 resources can only be accessed at their
normal 7.2 MHz. Part of the A2630 logic compensates by adding enough wait states to a normal 25 MHz cycle to span a full 68000 cycle at 7.2 MHz.
The Amiga Operating System supports the A2630’s on-board 32-bit wide memory as standard auto-configured expansion bus memory. The A2630 hardware makes sure that its on-boardmemory will be the first auto-configured memory seen by the Operating System to ensure that software uses it first. (Note:
Any C00000 memory ($C00000 - $D7ffff) will be seen by the operating system before any of the auto-configured memory.)
Since this fast memory does auto-configure it does not require that you employ any configuration program to make the memory available to the system.
The A2630 memory is located in the normal expansion address range and is part of the standard system limit of 8 megabytes of expansion bus memory. If your A2630 has 2MB of RAM, your system will only support an additional 6MB (for instance, a Bridgeboard and a 4MB RAM board). If the amount of expansion RAM exceeds the 8MB limit, you may experience problems with your Amiga.
Appendix A: Description of the A2630 Board This appendix outlines important jumpers and chip locations on the A2630 board. You should refer to the information in thisappendix when making any changes to the board’s default configurations, such as changing the math chip or installing additional RAM.
Jumper Configuration
The following explains the function of each jumper on the A2630. All settings — left, right, upper, and lower — pertain to the installed board as you face the populated side.
Clock Configuration Jumpers
J200 FOR FACTORY USE ONLY. If present, a jumper must be on pins 2-3.
J202 CRYSTAL BRIDGE. As shipped with a jumper in place, this jumper drives both the FPU and the CPU at the same speed (25 MHz). Normally, this jumper does not need to
be moved. However, if a separate FPU clock is installed, the jumper on J202 must be removed.
System Configuration Jumpers
J301 MEG4. As shipped with a jumper in place, the system expects 2 megabytes of memory. If the jumper is removed, the system expects 4 megabytes of RAM.
J302 B2000. As shipped, the jumper is off. If a jumper is set, the system expects an A2000 with the 68000 CPU removed.
This jumper must be set on 4-layer motherboards (made in West Germany). In the case of 2-layer motherboards, the jumper should only be set if the 68000 CPU
has been removed.
J303 AUTO. As shipped, with the jumper off, the on-board memory is auto-configured. If a jumper is set, all the card’s DRAM is disabled.
J304 OSMODE. As shipped, with the jumper off, the system autoboots AmigaDOS. If a jumper is set, the system will autoboot UNIX (provided the appropriate software is supplied
on a hard drive or magnetic tape).
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What ROMS do you have on the A2630?
Early boards will not work with anything but KS1.3
Updated ROM's are available, as are the binaries for you to make your own.
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Rom's are from 1990! WTF! I DID just update the KS to 3.1 on it . .
390282-04
390283-04
Board is REV 9.1
If I need ROMs, where can I get them..?
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I have a set for $25 shipped.
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Rom's are from 1990!
390282-04
390283-04
Not 100% sure but I think they are v4 ROM's. If so that's your problem. You need at least v6 ROMS to use KS2.04+ or even better the LAST version which was v7. This is a well known and documented bug. You wont be able to use KS3.1 until you upgrade the ROMs on your A2630.
http://amiga.resource.cx/exp/a2630
To check for sure, try to revert back to KS1.3 ROM?