DIY MegaFlash with a Winbond chip - damn!

By zPasi

Champion (444)

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12-04-2019, 23:07

I've been building a MegaFlash. Not from a kit, I want to be able to include my own customisations. Built a Konami4 mapper for starters (the JiPe design).

It didn't work. Then I built a cartridge test bench, a simple circuit based on Arduino. I have the old PJRC Teensy 2++ with sufficient pincount. With that test bench I can read / write cartridges and test mappers in them.

Though I wouldn't need the test bench to find out that FLK4.COM just doesn't support Winbond. It doesn't recognise the device ID, but there is more than that. Also the command sequences are different.

So far I have managed to write to the Winbond without a mapper (first 64K only), and read with or without the mapper. But writing with the mapper ... argh!

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By Wlcracks

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13-04-2019, 15:20

is an arduino fast enough for msx bankswitching?

By zPasi

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13-04-2019, 16:11

Wlcracks wrote:

is an arduino fast enough for msx bankswitching?

Sure, if it's a fast "arduino" Smile ! For basic 16 MHz AVR Arduino I don't know. Haven't tried it yet.

In this project, I'm using Arduino (Teensy) to simulate the MSX-side, to test how the cartridge responds. It's just preliminary testing since the timings are probably not right.

By Wlcracks

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13-04-2019, 16:26

ok thanks.