24 July 2002, 23:33 | #1 |
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A2000 mainboard jumper settings
Ello
I'm looking for the default settings of jumpers on A2000 mainboard (at the moment I use rev6.2B), especially j101, j200, j500... Is there anyone who could tell me exactly the purpose of these three jumpers or better every jumper of the A2000 mainboard? |
25 July 2002, 00:10 | #2 |
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Here you go, try this link out, scroll down a bit for the info you want
http://www.amiga-hardware.com/a2000.html |
25 July 2002, 00:48 | #3 |
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Thanks
Heh, but if I ask a question here it means that I've checked out the net before... I mean I would like to have someone's own words description of the jumpers, as I dont understand decription of the j101 and j200 from the pages on the net... besides there are more jumpers on the A2000 mainboard than the pages on the internet decribe... Btw, the pages on the net dont specify the default configuration as I put my A2000 together using three damaged units, messed up with the jumpers and don't remember now what were standard settings... Last edited by LUKas007; 25 July 2002 at 00:55. |
25 July 2002, 01:15 | #4 |
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J101 determines the CHIP ram addressing, are you using the OCS or ECS chipset, meaning have you the original or the enhanced Agnus chip installed?
Not sure, then look at the chips part number on top; if it's an 8370/8371 then it's the OCS Agnus only supports 512K chip ram. If the number is 8372/8372A then it supports 1MB of chip ram. If the number is 8372B then it supports 2MB of chip ram. Any of the 8372 series Agnus chips could be considered part of the Enhanced Chip Set. This should help determine what the J101 config should be. Not sure what the default setting should be however Now to determine the addressing, the easiest way would be to use SysInfo which will show you this info. This way you can see where the address is and compare it to the current J101 config and write it down for future reference If you swap around the J101 config and then boot up the machine and run SysInfo again, this address should have changed, if indeed you have one of the ECS Agnus chips! The J200 jumper determines the machines clock settings to either NTSC/60Hz or to PAL/50Hz. I like the line frequency setting better but of course I'm not sure which way this is either It's been a few years since I've had an A2000, I wish I could give you some more help on this |
26 July 2002, 19:08 | #5 |
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My A2000 has 8372A Agnus... When I set j101 to 1-2 the Ami has 512KB Chip, when j101 is set 2-3 then Ami has 1MB Chip. So I think this jumper is for downward compatibility with older Agnus revisions.
I've downloaded one scanned page from A2000 manual describing some jumpers and j200 is described as: This jumper is used to set the light-pen port number. In the 2-3 position, the light pen input will be the FIRE input of the mouse/joystick port 0. With the jumper in the other position, the light pen input will be the FIRE input of mouse/joystick port 1. The j300 is: This jumper determines the time base used for the 50/60Hz CIA timer chip. In the normal posistion, the 50/60 TICK clock, based on AC line frequency, is used as a time base. In the alternate position, the verticle sync pulse from the video section is used. The system will not operate properly without one of these clocks. The copy (as html format) is at: http://www.titan.co.nz/amigaak/AA060161.htm so the settings on http://www.amiga-hardware.com/a2000.html are a little messed up... Anyway, jmmijo thanks for posting. P.S. I dont exactly understand the meaning of the j300 heh... Last edited by LUKas007; 26 July 2002 at 19:16. |
04 August 2016, 10:42 | #6 |
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I know this is an old thread, but so is Amiga and this thread still appeared to my search when I wondered the same things as the OP and I would like to clear some doubts with this and also explain J900 which puzzled me:
http://www.amigawiki.de/doku.php?id=...:a2000b#jumper |
14 October 2017, 11:39 | #7 | ||
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Quote:
Quote:
Maybe i should restore the Fat lady 8371 because I've kept a note that it ships as 512 but is 1mb capable. Last edited by breech; 14 October 2017 at 13:00. |
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13 October 2021, 03:02 | #8 |
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Cn606
Hi,
Anyone know what CN606 on the A2000 mainboard is? Is it power? Is there a power connector like that on the main board that can be used for devices with the small power plug like floppies have? I have a small HD that can use that type power connector so am wondering if there is a way to do so on the A2000 mainboard if possible. |
13 October 2021, 07:00 | #9 |
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It has the interrupt signals on it, not a power connector.
You would have to take power from a zorro slot if you want a sturdy power rail. |
13 October 2021, 16:46 | #10 |
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14 October 2021, 06:54 | #11 |
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A regular PC motherboard won't have power outlets either, only inputs.
I've seen some non-standard power outlets in brand name PCs over the years, but it's not really something you can guarantee to find on every motherboard. |
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