BBC MASTER 128 Vs 512 ?

discuss both original and modern hardware for the bbc micro/electron
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drfloyd
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BBC MASTER 128 Vs 512 ?

Post by drfloyd » Fri Jun 19, 2020 3:03 pm

Hello, I continue by discover of the wonderful world of Acorn 8bit computers

What about the Master 512 Vs le 128 ? Is it a Master 128 with some adds ??? (can we transform a 128 into a 512 ?)
I know that it come with 512kB and a 80186 processor ?
Does it read natively MSDOS (Dos Plus apparently ?) and GEM ?
Basic 4 is still present ?

It is compatible Master 128 (and for the games ?)

Is there convenients to buy a Master 512 instead of a 128 ? (except the price !)

Thank you for all
Laurent

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rmbrowngr
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Re: BBC MASTER 128 Vs 512 ?

Post by rmbrowngr » Fri Jun 19, 2020 3:09 pm

From Wikipedia:

This system boasted a coprocessor card with a 10 MHz Intel 80186 and 512 KB memory. It also had the ability to run DOS Plus and the GEM graphical user interface. https://en.wikipedia.org/wiki/BBC_Master#Master_512

You can add a Raspberry Pi to emulate many co-processes to nearly all BBC Micro models e.g. B, B+ and Masters. The exception is the A version which doesn't have the Tube port.
Last edited by rmbrowngr on Fri Jun 19, 2020 3:13 pm, edited 1 time in total.
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.

drfloyd
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Re: BBC MASTER 128 Vs 512 ?

Post by drfloyd » Fri Jun 19, 2020 3:11 pm

so in fact it is the same computer with 512k and a copro ?

dp11
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Re: BBC MASTER 128 Vs 512 ?

Post by dp11 » Fri Jun 19, 2020 3:16 pm

Yes, Sorry to be clear the 512 is on the Copro
Last edited by dp11 on Fri Jun 19, 2020 3:55 pm, edited 1 time in total.

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danielj
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Re: BBC MASTER 128 Vs 512 ?

Post by danielj » Fri Jun 19, 2020 3:51 pm

It's the copro that has the 512k, the master is still 128k...

Naomasa298
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Re: BBC MASTER 128 Vs 512 ?

Post by Naomasa298 » Fri Jun 19, 2020 4:01 pm

A Master 512 is a Master 128.

Think of it as two computers sharing one output interface.

The Master 128 is a 128k computer with a 6502 processor, running BBC BASIC and runs Acorn software.

The 512 is a 512k computer with a 80186 processor, running DOS Plus and GEM. Some DOS software will work on it - a lot won't. And you still only have the Master's graphical capabilities.

If you're looking for the best 8-bit machine able to run the vast majority of Acorn software - the Master 128 is it.

drfloyd
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Re: BBC MASTER 128 Vs 512 ?

Post by drfloyd » Fri Jun 19, 2020 4:23 pm

ok, but the 512 is a "+" anyway... but a suppose expensive...

we can switch instantanly between PC DOS/GEM and BBC OS ? I suppose that for DOS & GEM there are date to load with the floppy first ?

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BigEd
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Re: BBC MASTER 128 Vs 512 ?

Post by BigEd » Fri Jun 19, 2020 4:25 pm

drfloyd wrote:
Fri Jun 19, 2020 3:11 pm
so in fact it is the same computer with 512k and a copro ?
So a Master 128 plus a Pi (and level shifter board) will match the Master 512. And you can switch the Pi more or less instantly to be something different, like a fast 6502, or a really fast 6502, or a number of other interesting possibilities.

A bit like the earlier question about the cheesewedge, you'd only buy a Master 512 if you really wanted the authenticity.

And yes, if you boot without the second processor, or disable it, you get to run the Acorn OS as if on a plain Master.

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danielj
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Re: BBC MASTER 128 Vs 512 ?

Post by danielj » Fri Jun 19, 2020 6:12 pm

I'm pretty sure JSBeeb and b-em let you emulate an 80186 coprocessor if you want to try playing with it. As I think someone said previously, all the information to get going is here:
http://www.cowsarenotpurple.co.uk/bbcco ... master512/

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egel
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Re: BBC MASTER 128 Vs 512 ?

Post by egel » Fri Jun 19, 2020 7:30 pm

drfloyd wrote:
Fri Jun 19, 2020 3:03 pm
Does it read natively MSDOS?
No, it runs Dos Plus. That is a DOS emulation on top of CP/M-86 writen by Digital Research. It can run some MS-DOS 2 and CP/M programs. The graphics are almost CGA, no brown but yellow. But it can do this, what no other CGA-only machine can:
90427468_3304394452906052_2695819103318310912_o.jpg

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