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AuthorTopic: Amiga 2000 Motherboard resistor packs  (Read 1274 times)

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Offline Tumbleweed

Amiga 2000 Motherboard resistor packs
« on: June 15, 2021, 08:11:06 AM »
Hi all,

Can any one help me identify what the resistor packs are on a B2000 V4.3 motherboard? Specifically the one at RP900 next to the CPU socket. See pic.

And where can I get new ones as I need to replace at least one of them.

Thanks in advance.

Weed
A3000T, Cybervision64, CSMKII 060; A3000D, PicassoII, Z3 Fastlane; A2000D, 040, PicassoII; A4000D, A1200, Blizzard 030 MKIV - both not working :(
 

Offline Prosonic

Re: Amiga 2000 Motherboard resistor packs
« Reply #1 on: June 17, 2021, 12:49:03 AM »
10k ohm

« Last Edit: June 17, 2021, 12:59:23 AM by Prosonic »
 

Offline F0LLETT

Re: Amiga 2000 Motherboard resistor packs
« Reply #2 on: June 17, 2021, 05:03:09 PM »
10k ohm

Also, they look like isolated arrays. Meaning each leg is commoned to first pin, to make sperate resistors.
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Offline AmigaSource

Re: Amiga 2000 Motherboard resistor packs
« Reply #3 on: June 18, 2021, 04:47:27 PM »
While I couldn't find anything specifically about Rev4.3, this is what I could find.  Hope this helps... 

Quick answer for the B2000 (Rev2)
rp101   4.7k (SIP 10 px9)   processor
rp100   4.7k (SIP 10 px9)     processor   
https://www.digikey.com/en/products/detail/cts-resistor-products/770101472P/1000481

rp901   1.0k (SIP 10 px9)   coprocessor
rp900   1.0k (SIP 10 px9)   coprocessor
https://www.digikey.com/en/products/detail/cts-resistor-products/770103102P/1000529

more links
- http://www.devili.iki.fi/mirrors/4x4.hopto.org/a500_2000trm_6.zip
   - A2000TRM_B2000-1a/1b.png for the rp100/101
        - RP900/901 are not on these schematics

-this link shows the RP900/901 on the board but no drop down info (B2000 rev 6.2)
         - http://locator.reamiga.info/locator.php?project=A2000

-this link you can find more V6 schematics.  here you will find RP900/901 but no resistor values
         - amigawiki.org https://www.amigawiki.org/doku.php?id=en:service:schematics
         - newly rendered schematics.
    - computers: A500, A600, A1200, A2000, A3000, 3000T, A4000, 4000T & CD32
    - expansion: A2060, A2065, A2320, A2410, A2620, A2630, A3630, A3640, CD32 Debug board
    - only certain revisions are available
    - pdf searchable format

   

Other places for schematics
- Amiga Schematics and Manuals 
        - http://www.devili.iki.fi/mirrors/4x4.hopto.org/
   - hand scans of schematics
   - A1000, A1000 ALR manual, A2060, A0265, A2232, A3000, A500/2000 technical manuals, A500+, A501, A600, 1084, 1701, Various Tech Topics, A1200, A3400 & 1993 Developers Conference


-Amiga PCB Explorer   
        - http://amigapcb.org/index.php
   - live interactive modeling of the PCB and components
      -A500, A600, A1200, A4000, A4000T, CD32, A2386sx

-Amiga technical Resource   
        - http://www.amiga.serveftp.net/schematics.html#A2000
   - TONS of different models!!
   - PDFs

-and here are a few more
        - https://dev.sigpipe.me/dashie/A2000
        - Amiga 2000 revision 6.2 motherboard re-done in KiCAD. Schematics and PCB done, and working, see README for notes.

        - https://github.com/jasonsbeer/Amiga-2000-ATX
        - Develop an Amiga 2000 PCB in the EATX form factor.


Please visit www.AmigaSource.com!!! Since 2001... Your NEW source for Amiga information. *** Always Under Construction *** (Over 1500+ Amiga links for your viewing pleasure! -- Please help spread the word!)
 

Offline Tumbleweed

Re: Amiga 2000 Motherboard resistor packs
« Reply #4 on: June 21, 2021, 07:36:38 PM »
Perfect. Thanks for the links.

After checking continuity and finding no broken traces I decided to pull Agnus from the socket. I don't have a chip puller so to avoid damaging the socket I managed to push the chip out by gently pushing a rod in the holes underneath the socket. A thorough clean with isopropyl alcohol of the socket and the chip. Reseated Agnus. Powered on an bingo I get the insert floppy boot screen! machines has function for more than 5 years and now its up and running. Installed GVP hard card with SCSI drive, CD ROM, Gotek, Picasso II, Flicker fixer and CSA Magnum 40/4 040 CPU board.

All working except the CSA SCSI. No autoboot hence why I have the GVP card installed which works fine.

Best.

Weed
A3000T, Cybervision64, CSMKII 060; A3000D, PicassoII, Z3 Fastlane; A2000D, 040, PicassoII; A4000D, A1200, Blizzard 030 MKIV - both not working :(