2x non-functional RiscPC mobos - for cost of postage

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nudelooney
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2x non-functional RiscPC mobos - for cost of postage

Post by nudelooney » Sun Oct 29, 2017 5:20 pm

Would anyone like two non-booting RiscPC motherboards? Both have suffered from battery corrosion. One is missing its RTC chip as a result.

Both have VRAM fitted. I'll see what DRAM I can put in them. One has OS3.7, one has OS3.5.

Free to anyone for cost of postage ... or I can bring them to the winter meetup in Leicestershire if you're in no hurry.

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danielj
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Re: 2x non-functional RiscPC mobos - for cost of postage

Post by danielj » Sun Oct 29, 2017 5:22 pm

Oooh, yes please! :) (I'm in no hurry and at Leicester) :)

d.

nudelooney
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Re: 2x non-functional RiscPC mobos - for cost of postage

Post by nudelooney » Sun Oct 29, 2017 5:48 pm

danielj wrote:Oooh, yes please! :) (I'm in no hurry and at Leicester) :)

d.
Marvellous! I shall bring them along!

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sbadger
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Re: 2x non-functional RiscPC mobos - for cost of postage

Post by sbadger » Mon Nov 13, 2017 3:01 pm

darn.. :wink:

i've a board with vram and dram socket damage (snapped and knack'd)

is there a known source so i can fit new ones? googling 72pin dram socket really doesn't work!)

stew
A3020| A3000x3| BBCBx5 | Electrn | Masterx4 |RiscPC| RPix3
A600 | C64 bbin x2|C64C | Toastrackx2 |QL | XB360&1X |GB |GBC |GBA |GBASP | DS | 3DS XL x2| MD | MS
Atari 7600 | PS1-2-3-4| PSP |Vita |SNES|GC|N64|Wii & U |Switch|ArcadeCab |Sony PVMx2

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danielj
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Re: 2x non-functional RiscPC mobos - for cost of postage

Post by danielj » Mon Nov 13, 2017 6:53 pm

Simm sockets: http://uk.rs-online.com/web/c/connector ... m-sockets/

VRAM will have a check. Depending on how salvageable these are I may start breaking things up...

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sbadger
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Re: 2x non-functional RiscPC mobos - for cost of postage

Post by sbadger » Mon Nov 13, 2017 8:13 pm

danielj wrote:Simm sockets: http://uk.rs-online.com/web/c/connector ... m-sockets/

VRAM will have a check. Depending on how salvageable these are I may start breaking things up...
nice thank you for that. Do you know why the riscpc boards have the angle simm board, assuming the pins align the board any reason why not to replace with a right angle one?

stew
A3020| A3000x3| BBCBx5 | Electrn | Masterx4 |RiscPC| RPix3
A600 | C64 bbin x2|C64C | Toastrackx2 |QL | XB360&1X |GB |GBC |GBA |GBASP | DS | 3DS XL x2| MD | MS
Atari 7600 | PS1-2-3-4| PSP |Vita |SNES|GC|N64|Wii & U |Switch|ArcadeCab |Sony PVMx2

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Re: 2x non-functional RiscPC mobos - for cost of postage

Post by danielj » Mon Nov 13, 2017 8:43 pm

Because the SIMMS won't fit next to each other - just replace like with like :) (Straight up would probably work)

d.

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Re: 2x non-functional RiscPC mobos - for cost of postage

Post by danielj » Mon Nov 13, 2017 9:11 pm

The VRAM socket is a 136way D/SIMM socket. I can't find anything appropriate. I suspect it was rather rare - I can't think of anything else that used something like that myself.... :?

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sbadger
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Re: 2x non-functional RiscPC mobos - for cost of postage

Post by sbadger » Tue Nov 14, 2017 8:20 am

danielj wrote: (Straight up would probably work)

d.
ok, thats what i meant by right angle, right angle to the board, sorry I don't know the conventions on this stuff :oops: .
It's not immediate obvious which ones one RS will fit, tape measure time!
A3020| A3000x3| BBCBx5 | Electrn | Masterx4 |RiscPC| RPix3
A600 | C64 bbin x2|C64C | Toastrackx2 |QL | XB360&1X |GB |GBC |GBA |GBASP | DS | 3DS XL x2| MD | MS
Atari 7600 | PS1-2-3-4| PSP |Vita |SNES|GC|N64|Wii & U |Switch|ArcadeCab |Sony PVMx2

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Re: 2x non-functional RiscPC mobos - for cost of postage

Post by sbadger » Tue Nov 14, 2017 12:34 pm

right ordered a couple of the 72pin simm ones, hopefully will come in time for me to bring to abug to fit.
Re. the vram, looking at it, it seems it's only lost the clip on one side, I think it's probably usable.
A3020| A3000x3| BBCBx5 | Electrn | Masterx4 |RiscPC| RPix3
A600 | C64 bbin x2|C64C | Toastrackx2 |QL | XB360&1X |GB |GBC |GBA |GBASP | DS | 3DS XL x2| MD | MS
Atari 7600 | PS1-2-3-4| PSP |Vita |SNES|GC|N64|Wii & U |Switch|ArcadeCab |Sony PVMx2

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danielj
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Re: 2x non-functional RiscPC mobos - for cost of postage

Post by danielj » Tue Nov 14, 2017 7:31 pm

Good luck! Pictures of how you get on! :) It doesn't need the clip to work at all. Fine without - that just slightly helps in removing the module.

d.

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sbadger
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Re: 2x non-functional RiscPC mobos - for cost of postage

Post by sbadger » Wed Nov 29, 2017 2:20 pm

danielj wrote:Good luck! Pictures of how you get on! :) It doesn't need the clip to work at all. Fine without - that just slightly helps in removing the module.

d.
Well if you recall I soldered the new socket in at ABUG, finally had a go this lunchtime with the ram and cpu you gave me. It lives!! :-D

Thanks a million!
A3020| A3000x3| BBCBx5 | Electrn | Masterx4 |RiscPC| RPix3
A600 | C64 bbin x2|C64C | Toastrackx2 |QL | XB360&1X |GB |GBC |GBA |GBASP | DS | 3DS XL x2| MD | MS
Atari 7600 | PS1-2-3-4| PSP |Vita |SNES|GC|N64|Wii & U |Switch|ArcadeCab |Sony PVMx2

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danielj
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Re: 2x non-functional RiscPC mobos - for cost of postage

Post by danielj » Wed Nov 29, 2017 2:27 pm

That's awesome news! :D Well done! Another RPC back to life! :) Now you just need the ADFS patch installed on an sd-ide HDD, and off you go :)

d.

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bagpuss22
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Re: 2x non-functional RiscPC mobos - for cost of postage

Post by bagpuss22 » Thu Nov 30, 2017 2:43 am

Daniel,

If your going to end up stripping these non working boards, If one of them is issue 1 could you
remove L13 and tell me if you can see where the pad (nearest the battery) connects to? I have a non
booting PC600 and L13 has lifted next to the battery. Would be nice to see if I can rewire it and
get the board to boot, assuming no other problems....

I need to find someone in the South East with a Risc PC to test some of my cards.

Russ

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danielj
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Re: 2x non-functional RiscPC mobos - for cost of postage

Post by danielj » Thu Nov 30, 2017 8:05 am

Hi Russ - just hook it to L11/L12 on the same side, as I said in the facebook thread. Alas, removing it won't show where it's meant to go as it's a multi-layer board and the traces are well buried.

If it's been battery gunked, you really need to check the continuity of all the circuits around there, you can often get hairline breaks between the VIAs and the resistor pack pins which need bridging and will stop the memory behaving. It's laborious work with a copy of the schematic and buzzing out each pin one at a time in the memory circuit, then marking them off.

d.

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sbadger
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Re: 2x non-functional RiscPC mobos - for cost of postage

Post by sbadger » Thu Nov 30, 2017 11:11 am

danielj wrote:That's awesome news! :D Well done! Another RPC back to life! :) Now you just need the ADFS patch installed on an sd-ide HDD, and off you go :)

d.
It's actually still got a 400mb conner drive, that still works.
It appears the machine used to belong to "The Romsey School", there's a bunch of stuff on there, inc students GCSE course work from years ago.
One application I've found is "The Fast Food Diner", from the British Meat Board, given free to schools.
A3020| A3000x3| BBCBx5 | Electrn | Masterx4 |RiscPC| RPix3
A600 | C64 bbin x2|C64C | Toastrackx2 |QL | XB360&1X |GB |GBC |GBA |GBASP | DS | 3DS XL x2| MD | MS
Atari 7600 | PS1-2-3-4| PSP |Vita |SNES|GC|N64|Wii & U |Switch|ArcadeCab |Sony PVMx2

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