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SD2IEC design for commodore 64 [message #8386]

Thu, 18 March 2021 07:17

rhkoolstar
Messages: 276
Registered: October 2015

Senior Member

Hi all,
Anybody interested in a SD2IEC disk emulator for a Commodore 64 ?
I build my own in SMD for about 3 Euro total (see picture)

Rienk

Attachment: 20210318_151850.jpg
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Re: SD2IEC design for commodore 64 [message #8389 is a reply to message #8386]

Sat, 20 March 2021 16:22

scruss
Messages: 62
Registered: December 2015
Location: Toronto, Canada

Member

That's rather nice. I paid a lot more for the one I have!

> Does anyone know what each of the pins on the 6502 CPU chip in the Apple II Plus does?
They all plug into the socket on the motherboard to keep the chip from drifting away. - c.s.a2 FAQ of yore

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Re: SD2IEC design for commodore 64 [message #8391 is a reply to message #8389]

Sun, 21 March 2021 02:24

borutk
Messages: 34
Registered: November 2015

Member

Yes, please! I built mine with a Arduino Mega, but would definitely prefer something smaller.

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Re: SD2IEC design for commodore 64 [message #8392 is a reply to message #8391]

Sun, 21 March 2021 12:02

rhkoolstar
Messages: 276
Registered: October 2015

Senior Member

Want one? I have a spare all soldered up.

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Re: SD2IEC design for commodore 64 [message #8393 is a reply to message #8392]

Sun, 21 March 2021 12:41

borutk
Messages: 34
Registered: November 2015

Member

Yes of course. I sent you a PM to your gmail address.

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Re: SD2IEC design for commodore 64 [message #8394 is a reply to message #8386]

Mon, 22 March 2021 11:07

jbforrer
Messages: 25
Registered: May 2017

Junior Member

Hi Rienk,

That's cool. We have a similar need in the Apple ii retro community emulating floppies.
I'b be interested to see how you have done it.

I built up something similar for my retro Apple iie. Called the "SDISK2" which uses an ATMega328p.
here: http://tulip-house.ddo.jp/DIGITAL/SDISK2/english.html

The 328 is overclocked at 27MHz, probably to meet timing issues and is reliable, works great.
Almost like a cheap FPGA.

Cheers.

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Re: SD2IEC design for commodore 64 [message #8395 is a reply to message #8394]

Mon, 22 March 2021 13:25

rhkoolstar
Messages: 276
Registered: October 2015

Senior Member

I did nothing special. Just create a PCB from the schematics.
This is all GNU public license stuff.
I am just trying to keep this hobby affordable.

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Re: SD2IEC design for commodore 64 [message #8405 is a reply to message #8395]

Tue, 23 March 2021 14:49

tingo
Messages: 115
Registered: February 2017
Location: Oslo, Norway

Senior Member

Could you link to the schematics you used, @rhkoolstar?

Torfinn

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Re: SD2IEC design for commodore 64 [message #8408 is a reply to message #8405]

Tue, 23 March 2021 22:54

rhkoolstar
Messages: 276
Registered: October 2015

Senior Member

Sure It's a subset of the Shadowolf version 2 design. Basically an AVR with 3 voltage converters and an SD card interface

Attached are the schematics and the Gerber files
/forum/index.php?t=getfile&id=2015&private=0

/forum/index.php?t=getfile&id=2015&private=0

The Gerbers contain 3 boards, the mainboard, the control board and an ISP-to-SD board. The idea is to program the bootloader with R16 (PRG) temporarily shorted and the ISP-to-SD inserted in the SD card connector. For this to work the PCB thickness needs to be 0.8 mm, so the SD card will fit. (also cuts a lot easier)

Come to think of it, maybe it is a good idea to make a Gerber inventory next to the Board inventory on the Wiki.

Attachment: SD2IECv3.zip
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Attachment: SD2IECv3.pdf
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Attachment: Screenshot.png
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