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COMMODORE 64 SD2iEC & KERNAL CART COMBO



This is a tested and working project.



  I think, SD2iEC (Commodore disk drive emulator) and Kernal Cart is a very good combination. They come together to make a complete Disk Operating System for your Commodore 64.


  Actually, this PCB is a combination of two independent projects, one of them is SD2iEC (Commodore disk drive emulator) and the other is KernalCart (Commodore's low-level Operating System ROM in cartridge form). They can be used separately or both together. If you want to use SD2iEC unconnected to the expansion port then you need to provide DC +5V power for the (+ -) pins on the PCB.



Original SD2iEC is designed by Lars Pontoppidan


Original Kernal Cart is designed by SukkoPera


  While working with Commodore's original kernal ROM, The SD2iEC loads slow (like speed of original old Commodore 1541 disk drive). When you use 'SD2iEC Kernal' or 'JiffyDOS * Kernal' with your SD2iEC, the loading speed increases spectacularly.


Average loading speeds comparison:

Original C64 kernal : 500 byte/second

Jiffy DOS Kernal: 10150 byte/second


Here is; 180 blocks (45KB) loading, with DolphinDos-patched-JiffyDOS, video:


https://www.youtube.com/watch?v=6asuU_cAbqs


Referral for SD2iEC; I used ozayturay's schematics

https://github.com/ozayturay/EagleProjects/tree/master/SD2IEC


SD2iEC Official Site is https://www.sd2iec.de/


SD2iEC firmware download link: https://www.sd2iec.de/nightlies/

(Use firmware ...larsp-m644p.bin)


SD2iEC Kernal 2.2 download link: https://csdb.dk/release/?id=159050 (Thanks to Claus)


MMC2IEC / SD2IEC - Evolutionen link: http://www.pitsch.de/stuff/mmc2iec/index.htm


  Referral for Kernal cart; I used SukkoPera / OpenC64KernalCart project and Turbo DOS V3 cartridge PCB images.


https://github.com/SukkoPera/OpenC64KernalCart


http://blog.worldofjani.com/?p=3736



  If you need, you can find more information from original project's sites, and you can find many more information from internet.


  On this PCB v1.02, I added an enable/disable switch (headers and jumper cap) for Kernal Cart, it is between 74LS30 pin-8 and 27c512 eprom pin-22. (Disabling KernalCart is required while using SD2iEC COMBO without CPU pin28 cable connection)



  To make this project, you have to program ATMEGA644P TQFP-44 and 27C512 dip28


The link below contains some kernal ROMs like Dolphindos, Speeddos, SD2IEC v2.2 kernal ... and a sample 27c512 eprom image for testing. You can also run DEADTEST 781220 ROM file in 27c512 eprom .

https://archive.org/download/c-64-kernals_202004/C64_KERNALS.zip



* KernalCart is also compatible with JiffyDOS ROM, you can buy and use JiffyDOS 64 KERNAL ROM Image

http://store.go4retro.com/jiffydos-64-kernal-rom-overlay-image/



  ** Before soldering Micro SD Card Module you should place some isolation tape between PCB and SD card module.



Many thanks to SukkoPera, Lars Pontoppidan and Ozay Turay for their great works.




In order to protect your electronical devices, always turn off your Commodore 64 before connecting or unconnecting any device.




Ps. While transfering data (reading or writing) from SD cards it should not be interrupted like power-off or Reset systems. Otherwise that may damage SD cards.



Have Fun

Thank you.




COMPONENTS:


ATMEGA644P TQFP-44

27C512 or W27C512 DIP28 (maximum; 64KB is for 8x kernal ROM)

DIP28 WIDE IC SOCKET (for eprom)

74LS30 DIP14

DIP14 IC SOCKET

6Pin MICRO SD CARD MODULE (will be soldered from the bottom side **)

RED LED

GREEN LED

2 PCS. 270ohm - 1K 1/4watt RESISTANCE (value changes leds brigtness)

10K 1/4watt RESISTANCE

8 Mhz Passive Quartz Crystal

1N4148 DIODE

2 PCS. 33pf CAPACITORS

6pin MALE DIN CONNECTOR

6PIN MALE HEADER

5 PCS. 2PIN MALE HEADER

2 PCS. 3PIN MALE HEADER

1PIN MALE HEADER

2 PCS. HEADER JUMPER CAP

3PCS. 3pin 2.54mm SPDT slide SWITCH

3 PCS. 100nf CAPACITORS

3 PCS. RIGHT ANGLE TACTILE BUTTON

7 PCS. 30cm MALE-FEMALE DUPONT CABLE

MICRO SD CARD (4GB will be enough)





FUSE SETUP



If your programmer have capability to test IC chips, like 74LS series, then you should not forget to test them before soldering, some chips may have defect. (TL866 Minipro Programmer is able to test some of logic IC)

Bill of materials used in this project

ATMEGA644P TQFP-44
1
27C512 or W27C512 DIP28
1
DIP28 WIDE IC SOCKET
1
74LS30 DIP14
1
DIP14 IC SOCKET
1
6Pin MICRO SD CARD MODULE
1
RED LED
1
GREEN LED
1
2 PCS. 270ohm - 1K 1/4watt RESISTANCE
2
10K 1/4watt RESISTANCE
1
8 Mhz Passive Quartz Crystal
1
1N4148 DIODE
1
2 PCS. 33pf CAPACITORS
2
6pin MALE DIN CONNECTOR
1
6PIN MALE HEADER
1
5 PCS. 2PIN MALE HEADER
5
2 PCS. 3PIN MALE HEADER
2
1PIN MALE HEADER
1
2 PCS. HEADER JUMPER CAP
2
3PCS. 3pin 2.54mm SPDT slide SWITCH
3
3 PCS. 100nf CAPACITORS
3
3 PCS. RIGHT ANGLE TACTILE BUTTON
3
7 PCS. 30cm MALE-FEMALE DUPONT CABLE
7
MICRO SD CARD (4GB will be enough)
1
May 05,2020
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