The Big MegaFlashROM SCC+ SD Topic

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Par luppie

Paladin (869)

Portrait de luppie

30-04-2014, 21:23

Guillian wrote:
luppie wrote:

Is it possible to do add it our self ? Or does the internal software needs to be updated for this ?

You can add it yourself with basic soldering and electronics skills.
The software does not need to be updated, since you can use the /CS or DI and DO SD card signals to check the activity.
I have not done it myself, so I can't post a tutorial.

I've opened up the cartridge to see if I can add a read/write status led.
I see that the SD-card slots are connected to testpoints P1 till P8

@Guillian can you please give me the signals on P1 till P8 ?

If i have to guess, it is:

1 - SD1 / CS
2 - SD1 / DI
3 - SD1 / CLK
4 - SD1 / DO
5 - SD2 / CS
6 - SD2 / DI
7 - SD2 / CLK
8 - SD2 / DO

Par edoz

Prophet (2465)

Portrait de edoz

30-04-2014, 21:07

can you open the cartridge without damaging ?

Par luppie

Paladin (869)

Portrait de luppie

30-04-2014, 21:18

No, there are 2 plastic pins that will break, but the label is still undamaged. I have noticed this with all cartridges from the Cartridgeshop.
But superglue can fix this ;-) There is no external damage.

Par Guillian

Prophet (3516)

Portrait de Guillian

30-04-2014, 21:37

luppie wrote:

@Guillian can you please give me the signals on P1 till P8 ?

P1 = SD1 /CS
P2 = SD1 /DI
P3 = SD1 /CLK
P4 = SD1 /DO
P5 = N/C
P6 = SD2 /CS
P7 = SD2 /CLK
P8 = SD2 /DO

Par luppie

Paladin (869)

Portrait de luppie

30-04-2014, 22:25

Thanks Guillian, but does the SD2 slot does'nt have a DI signal ? Or is that one not present on the PCB pads ?

Par Guillian

Prophet (3516)

Portrait de Guillian

30-04-2014, 22:37

DI is common for both SD cards.

Par luppie

Paladin (869)

Portrait de luppie

01-05-2014, 00:24

I've tested a status-LED on SD1-D0, with the following results:

Test on my Zemmix NEO:
At initializing the SD card, the LED flashes on activity and switches OFF.
When I'm in Dos and issue a DIR command, the LED flashes on activity, but stays ON like DO is still high after finishing reading.

Test on my Turbo-R ST
LED goes on at Boot and doesn't blink at any activity.

Tomorrow I'll hook up my logic analyzer to see what's going on.

Par Pencioner

Scribe (1542)

Portrait de Pencioner

01-05-2014, 02:38

Guillian wrote:
Pencioner wrote:

I'm still wondering if this can be used now (with some special .OPF file syntax) or it will be available in future versions? Looks nice, that is more usable than 8 letters of file name, i would love it though...

It is not used. IIRC, the idea was to add an small description to each ROM. But it was not implemented.

I'm pretty sure it doesn't require any hw support from MFR to do this? Possible implementation is in opfxsd with multirom.rom software parts, right? (Just an idea)

Par edoz

Prophet (2465)

Portrait de edoz

01-05-2014, 16:28

Maybe for all those that not have seen it but there is a MegaFlash driver created for SymbOS!!
See this post ! Link

Par Guillian

Prophet (3516)

Portrait de Guillian

01-05-2014, 19:42

luppie wrote:

When I'm in Dos and issue a DIR command, the LED flashes on activity, but stays ON like DO is still high after finishing reading.

I have made a quick test and seems to work.
Try to connect the cathode to DO and the anode+resistor to 3.3V

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