Flash ROM adapter?

This is the right place to discuss on how to implement hardware vsync, adding a VIA or AY chipset, puting multiple roms, or how to design a new flash expansion card.
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tingo
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Flash ROM adapter?

Post by tingo » Wed Jul 15, 2009 1:51 am

Has anyone made a Flash ROM adapter for the Oric machines?
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JamesD
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Post by JamesD » Wed Jul 15, 2009 6:08 pm

Are you wanting to use Flash to replace the ROM(s) or use it as a storage device?

I haven't seen either but the first is fairly easy.

Since the Oric didn't have cartridge based games a "FLASH Cart" like you can find for many machines isn't particularly useful unless you want to patch a lot of games.

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tingo
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Post by tingo » Wed Jul 15, 2009 8:18 pm

I want to use Flash to replace the ROMs, yes.
Then it would be easy to test various bug fixes and enhancements.
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Post by highwayman » Thu Jul 16, 2009 11:49 pm

forget flash, it's obsolete.

use Feroram.
(made by ramtron)

it's like sram but nonvolatile - you just write to it like normal.

it comes like ram - 8k, 32k, 128k etc.
so use a 32k and bankswitch the last addressline.
(could be a lifesaver if you keep one bank original incase of crashing the other. :)

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Post by JamesD » Fri Jul 17, 2009 5:44 am

You could set it up so you could disable the writes in hardware to prevent corrupting the ROM area.

BTW, Flash is cheaper.

If you use boot block FLASH you just write a command to the FLASH and the first 16K is protected. The startup code could enable the protection unless you press a key on startup.

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Post by highwayman » Fri Jul 17, 2009 11:29 pm

flash is cheaper, but only comparing £3 to £7
and it's getting harder to find flash that is in a dip package and not just tsop.

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Post by JamesD » Sat Jul 18, 2009 3:34 am

I'd be more than happy to sell some 256K PLCC FLASH chips for that price!
http://www.atmel.com/dyn/resources/prod ... OC1017.PDF

Too bad the shipping from the US would be more than the chip.

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Post by highwayman » Tue Jul 21, 2009 4:24 am

plcc is no better than tsop for prototyping on stripboard.

besides, the ferro price i listed was u.k. - if you source from the u.s. then it's about £3.70

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Post by JamesD » Sat Jul 25, 2009 4:49 am

highwayman wrote:plcc is no better than tsop for prototyping on stripboard.
And there are DIP adapters on ebay.

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Post by Twilighte » Sat Jul 25, 2009 2:57 pm

JamesD wrote:Since the Oric didn't have cartridge based games a "FLASH Cart" like you can find for many machines isn't particularly useful unless you want to patch a lot of games.
Not strictly true, Fabrice Frances demonstrated a 16K Oric cart at a CEO some years back. I think the game was Painter :P

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