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C64 SD2IEC LP SMD

8 months ago 639
  • Description
  • Documents
  • BOM
  • Attachments
  • Members
  • Comments

Description

C64 SD-Card adapter based on the LarsP-design (https://larsee.com/blog/2007/02/the-mmc2iec-device/) with cassette port plug. For more information visit https://www.sd2iec.de.

IMG_20191208_124215_x.jpg

Documents

C64 SD2IEC LP

C64_SD2IEC_LP_v1.1

BOM

ID Name Designator Footprint Quantity
1 8MHz X2 HC-49S 1
2 1k8 R6,R7,R5 0603 3
3 10k R1,R4 0603 2
4 3k3 R10,R9,R8 0603 3
5 1k R11,R2,R3 0603 3
6 DIP Switch DEVICE1 DSWB02LHGET 1
7 POWER LED3 LED-0603 1
8 WRITE LED2 LED-0603 1
9 AMS1117-3.3 U3 SOT-223 1
10 ICSP-6 ICSP1 ICSP-6 1
11 C64_CASS_PORT J3 C64_CASS_PORT_2 1
12 READ LED1 LED-0603 1
13 Straight headphone jack J2 AUDIO-PJ313D 1
14 4u7 C7,C10 0603 2
15 100n C4,C3,C2 0603 3
16 1u C9,C8 0603 2
17 33p C6,C5 0603 2
18 47u C1 1206 1
19 TactSwitch PREV,NEXT,RESET TACTILE-PTH 3
20 ATMEGA644PA-AU U1 TQFP-44_10X10X08P 1
21 MICRO_SD_SOCKET J1 MICRO_SD_SOCKET 1
22 MAB6H X1 DIN_6 1

Attachments

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sd2iec_lp_firmware.zip
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Comments (5)

Kimmo Lehto Reply

I suppose the pull-ups and downs for the microsd card are somehow handled in mega644 + software?

Stefan Wagner Reply

@kimmo.lehto Hi, yes, the SPI protocol is fully handled by the micro. The board works as it is perfectly.

Kimmo Lehto Reply

Another question, sorry for the disturbance :) I wonder about the MicroSD CS signal. Why does it need to get level shifted, I believe it can simply be grounded.

Stefan Wagner Reply

@kimmo.lehto It will probably work that way as the sd-card is the only slave on the spi-bus. However this is not a good style ;-)

Stefan Wagner Reply

@kimmo.lehto And yes, it will probably work without the decoupling capacitors as well, especially the AREF-one ;-)

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