MAMEWorld Forums - EmuChat - THIS --> Read Pernod's post about: Acorn BBC Model B

>I have a problem with the BIOS for the BBC Model B I have all the files but it does not
>want to start

Read Pernod's post.

*copied here for convenience*

Pernod explains and provides a solution in case you insist on running an older version of MAME

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Pernod's post

https://www.mameworld.info/ubbthreads/sh...part=1&vc=1

The dnfs120-201666.rom was removed from bbcb.zip in MAME 0.216, so updating your MAME will solve that issue. Or you can copy dnfs120.rom from your bbc_acorn8271.zip into bbcb.zip.

You also have an incorrect checksum for saa5050, this was updated over a year ago so you need to find a newer saa5050.zip too.
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You have been jumping around on different sites and running different versions of MAME.

Read this https://docs.mamedev.org/usingmame/aboutromsets.html

It will explain about roms sets.

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https://forums.bannister.org/ubbthreads.php?ubb=showflat&Number=116605#Post116605

Yes I said that I was under Windows 7 with MAME version 0.216... I am a beginner I do not understand much sorry..
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If you are just learning how to use MAME, stay with latest release. Stop trying to run different versions until you understand how MAME works.

The reason why the error message regarding rom dnfs120-201666.rom
is because you were using an older version of MAME (.214) and the rom set you had shown the error message was likely an already updated rom set for newer versions of MAME .216 or later.

Why was BIOS rom set changed? Maybe because of this particular update that Pernod had done back three months earlier in November of last year?

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https://github.com/mamedev/mame

https://github.com/mamedev/mame/commit/9f5f84272ecec6486a998cff6e46fdad9b73ae61

2019-11-05

bbc.cpp: Replaced ROM/RAM memory banks with handlers to allow access from internal expansion boards.
- Added slot interface for internal expansion boards.
- Added BBC Master cartridge slot interface to allow implementation of more complex cartridges, including Electron cartridge devices.
- Removed Sideways RAM configuration option, to be re-implemented as internal boards.
- Empty BBC Master cartridge sockets return video data on data bus.

ROM_START(bbcb)

- ROM_LOAD("dnfs120-201666.rom", 0x30000, 0x4000, CRC(8ccd2157) )
+ /* appropriate DFS will be inserted by fdc device */
+ //ROM_LOAD("dnfs120-201666.rom",
--

Use .216 or newer versions and that error message should not be appearing since you probably already have an updated BIOS rom set.