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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: Tumbleweed on June 15, 2021, 08:11:06 AM
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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
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10k ohm
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10k ohm
Also, they look like isolated arrays. Meaning each leg is commoned to first pin, to make sperate resistors.
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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.
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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