Model B+ ROM placement and position of L hats

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Remklep
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Model B+ ROM placement and position of L hats

Post by Remklep » Sat Jan 04, 2020 12:47 pm

Gents,

Is there a preferred position for the different ROMS to be in expansion sockets?
ie. at the moment in my model B+ in socket IC71 I have the Acorn OS ROM, in IC68 thg 1770 DFS ROM and in IC62 the TurboSPI ROM.
The homemade stack of 3 62256 mem chips is in socket IC44.
Does the order matter?

Also, what do the jumpers L9, L11,L12,L15,L18,L19 and S13 do?

Thanks.
BBC Model B+ 64K, 128K Memory Mod, RetroClinic External PiDirect with Raspberry Pi 3B.
BBC Master 128, RetroClinic Internal PiDirect with Raspberry Zero, TurboSPI MMC, RobC's VideoNuLa, Gotek Floppy Emulator.

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rmbrowngr
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Re: Model B+ ROM placement and position of L hats

Post by rmbrowngr » Sat Jan 04, 2020 12:59 pm

This article can answer some of your questions: https://martin-jones.com/2015/01/18/sid ... o-model-b/

If you are adding sideways RAM as described in this article http://www.firths.org/bbc/my_b+128k.html I would recommend placing it in IC57 socket as it works correctly with the utils in the DFS ROM.
Richard B
Acorn Electrons issue 4 and 6, MRB, Plus 1, AP6, AP5, Pegasus 400, BeebSCSI, Gotek, Raspberry Pi, GoSDC MBE.
BBC B+ 64K (128K upgraded) with Duel OS, Raspberry Pi and Gotek.

Remklep
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Re: Model B+ ROM placement and position of L hats

Post by Remklep » Sat Jan 04, 2020 3:08 pm

Thank you kindly Sir, moved the RAM chips to IC57.
BBC Model B+ 64K, 128K Memory Mod, RetroClinic External PiDirect with Raspberry Pi 3B.
BBC Master 128, RetroClinic Internal PiDirect with Raspberry Zero, TurboSPI MMC, RobC's VideoNuLa, Gotek Floppy Emulator.

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1024MAK
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Re: Model B+ ROM placement and position of L hats

Post by 1024MAK » Sat Jan 04, 2020 3:31 pm

See also this thread.

Mark

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