REV B Amiga writes mod - step by step

HxC Floppy Emulator on Amiga support
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lotharek
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REV B Amiga writes mod - step by step

Post by lotharek »

1. locate the board ;-)

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2. bend up all legs of 23k256 ( dip8) - caut off all legs exept 4 - GND and put on the board so leg no4 goes into GND via ( check with multimeter !)

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3. Use Your soldering iron :-)

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4. connect via 220ohm resistors like in picture

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5. Solder together pin 7 and 8, connect via 220 ohm resisitor pin1 of 23k256 and pin 22 of main uProcessor

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6.connect via 220 ohm resisitor pin2 of 23k256 and pin 29 of main uProcessor

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7. Use short piece of wire to connect pin 7 and 8 of 23k256 sram to right hole under this little thinny ;-) (capacitor)...


Image



Voila,

when powered on, EMUL MUST SAY SRAM OK
Last edited by lotharek on Sun Apr 10, 2011 10:53 pm, edited 1 time in total.
..... Atari Roxxx !!!

lolafg
Posts: 16
Joined: Tue Mar 09, 2010 8:36 pm
Location: Tours

Post by lolafg »

Hi Lotharek ,

would you consider selling a kit for Rev B owners ,if yes i would be interested , i'm a noob in soldering but my brother could do the job for me .

thanks in advance for your answer.

I can't join you in your site has i don't use Outlook...

edit : found your email.

lotharek
Posts: 180
Joined: Fri Nov 13, 2009 9:35 am
Location: Poland
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Post by lotharek »

REV B is no more anymore available

Now, REV C is coming. also kits ill be availabel (PIC+BOARD)

Image
..... Atari Roxxx !!!

nurgle
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Joined: Tue May 04, 2010 9:30 pm

Re: REV B Amiga writes mod - step by step

Post by nurgle »

Sorry for digging up that ancient thread. I just found out that I have a REV B board and think about upgrading it. Are the pictures for this step by step guide available anywhere?

Jeff
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Re: REV B Amiga writes mod - step by step

Post by Jeff »

nurgle wrote:
Sun Jan 16, 2022 12:24 am
Sorry for digging up that ancient thread. I just found out that I have a REV B board and think about upgrading it. Are the pictures for this step by step guide available anywhere?
Hello,

This is in the releases notes :

22/08/2010: Firmware SD HxCFloppyEmulator v1.3.0.0

- Amiga Write support added :

Note to the Revision B PCB owners :

To activate this new features you need to add a Microchip 23K256 SPI SRAM chip and 4 resistors.
The connection to do is :

23K256 pin 1 -> 220ohms resistor -> PIC18F4620 pin 22
23K256 pin 5 -> 220ohms resistor -> PIC18F4620 pin 27
23K256 pin 6 -> 220ohms resistor -> PIC18F4620 pin 28
23K256 pin 2 -> 220ohms resistor -> PIC18F4620 pin 29
23K256 pin 8 & 7 -> VCC3.3V (this voltage can be found at the capacitor under the sdcard connector or at the output of the regulator)
23K256 pin 4 -> GND
23K256 pin 3 -> Not connected.

(a 100nF capacitor is also recommended at the pin 8 of the 23K256)

After this modification you should see the message "SRAM OK" at power up.

nurgle
Posts: 4
Joined: Tue May 04, 2010 9:30 pm

Re: REV B Amiga writes mod - step by step

Post by nurgle »

Yes I read that in the release notes. It would have been easier with the pictures that seem to have existed in this thread at some point.

If someone else can attach a picture of his modded REV B board that would be appreciated as well. :-)

nurgle
Posts: 4
Joined: Tue May 04, 2010 9:30 pm

Re: REV B Amiga writes mod - step by step

Post by nurgle »

Update: Just after posting I found something via google picture search. Hope it is okay to link it: http://www.mfilos.com/2011/01/a600-aca6 ... c-mod.html

That solves it for me. Clear enough to follow.

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