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SmitdoggAdministrator
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DU: Philips P2000T/Acorn System 2/BBC Micro
#379513 - 11/12/18 03:34 AM


Sean Riddle decapped and extracted the internal ROM of the SAA-5050 Teletext chip used on Philips P2000T/Acorn System 2/BBC Micro











gregf
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Re: DU: Philips P2000T/Acorn System 2/BBC Micro *edit* new [Re: Smitdogg]
#379516 - 11/12/18 03:56 AM


>and extracted the internal ROM of the SAA-5050 Teletext chip used on Philips P2000T/Acorn System 2/BBC Micro


Holiday present now in source code in time for next official release.

2018-11-13

Replace dump of SAA5050 internal character generator ROM with verified copy from decap. This also matches the Signetics and Mullard SAA5050 datasheet pixel listings. [Sean Riddle, ClawGrip, The Dumping Union]


src/devices/video/saa5050.cpp

ROM_LOAD("saa5050", 0x0140, 0x03c0, BAD_DUMP CRC(6298fc0b)
ROM_LOAD("saa5050", 0x0140, 0x03c0, CRC(201490f3)

I wasn't familiar with the system since it was more of a Europe region product, but a former coworker from long ago fondly talked about some of the games of the system. I didn't know if there were any other emulators running these games so I didn't have an answer for him at the time.

Edited by gregf (11/14/18 10:00 AM)



MASH
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Mmmmmm yummy... Mullard SAA5050 new [Re: Smitdogg]
#379520 - 11/12/18 11:58 AM


> Sean Riddle decapped and extracted the internal ROM of the SAA-5050 Teletext chip
> used on Philips P2000T/Acorn System 2/BBC Micro

Also used by Malzak (Kitronix)








Vas Crabb
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Re: Mmmmmm yummy... Mullard SAA5050 new [Re: MASH]
#379521 - 11/12/18 12:17 PM


> Also used by Malzak (Kitronix)

There's no chance of that thing being emulated properly until someone traces out the rat's nest of wires and produces a schematic. There's just too much guesswork involved otherwise.



Pernod
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Re: DU: Philips P2000T/Acorn System 2/BBC Micro new [Re: gregf]
#379528 - 11/12/18 09:13 PM


> > and extracted the internal ROM of the SAA-5050 Teletext chip used on Philips
> P2000T/Acorn System 2/BBC Micro
>
>
> Now this will be a good holiday present. I wasn't familiar with the system since it
> was more of a Europe region product, but a former coworker from long ago fondly
> talked about some of the games of the system. I didn't know if there were any other
> emulators running these games so I didn't have an answer for him at the time.

The main BBC emulators are B-em and BeebEm, they're dated but are seeing some recent development. For quick gaming in a browser take a look at http://bbcmicro.co.uk/.

MAME has improved a great deal over the past couple of years, but still has a little catching up to do. It's certainly more configurable and supports many more expansion devices than other emulators though.



gregf
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Re: DU: Philips P2000T/Acorn System 2/BBC Micro new [Re: Pernod]
#379533 - 11/12/18 10:25 PM





>> but a former coworker [first name Thomas iirc] from long ago fondly
>> talked about some of the games of the system. I didn't know if there were any other
>> emulators running these games so I didn't have an answer for him at the time.


>The main BBC emulators are B-em and BeebEm, they're dated but are seeing some recent
>development. For quick gaming in a browser take a look at http://bbcmicro.co.uk/


That's a bummer I didn't have links for Thomas way back then around 2004 or maybe it was early 2005. I didn't follow MESS and or computer emulation including DOSBox since I was following MAME much more at the time even though MESS was emulating the stuff MAME was emulating since MESS incorporated MAME code when official releases were out.

His [Thomas] interest was in computers rather than arcade games and his main interests would have been anything related to BBC products instead of Apple/IBM/Commodore products.
I wish I had an answer for him back then. The job was a temporary job for me and I didn't see anyone after job was completed. It used to be in a small industrial area, but had been rezoned and houses are now in place in what used to be a former industrial zone.


>MAME has improved a great deal over the past couple of years, but still has a little
>catching up to do. It's certainly more configurable and supports many more expansion
>devices than other emulators though.

Kudos to your work over past few years. If former coworker [Thomas] caught your work and all this today's emulation progress was back then instead, you'd made his day.


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