COMMODORE 64 - KERNAL TABLE (901227 KERNAL ROM REPLACEMENT ADAPTER)
COMMODORE 64 - KERNAL TABLE
(901227 KERNAL ROM REPLACEMENT ADAPTER)
Hello,
This is a tested and working circuit board.
Commodore's low-level Operatin System was named the Kernal.
This adapter is suitable for C64 24pin kernal ROMs
You can find and download many different kernal ROMs for your C64, from internet.
You can also run DeadTest 781220 with this kernal table.
This adapter lets you to use max. 8 different kernal ROMs in one 27C512 eprom.
The link at the bottom of this page contains some kernal ROMs like Dolphindos, Speeddos, SD2IEC v2.2 kernal ... and a sample eprom image for testing.
This kernal table 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/
Ps. In order to use this kernal table, your Commodore 64's 901227 (U4 - kernal ROM) have to be desoldered.
In terms of device and software security; please turn your Commodore64 off before switching ROMs.
There is a newer version of this PCB, you'd better take a look at it.
Gerber files can be changed at any time. Before paying for the PCBs, be sure to update your orders!
Have fun
Thank you.
e-mail: c64istanbul@bikom.com
Components
27C512 (or W27C512) (FOR 8X ROM)
3 PCS 10K 1/4 WATT RESISTANCE
2 PCS. 12 PIN 2.54mm ROUND MALE HEADER
3 PCS 3PIN 2.54mm MALE HEADER
3 PCS 2.54mm JUMPER CAP
28-PIN WIDE DIP IC SOCKET
24-PIN WIDE DIP IC SOCKET (FOR U4 on C64 BOARD )
And you will need an eprom programmer to program 27c512
PS. Gerbers updated 08.07.2020
COMMODORE 64 - KERNAL TABLE (901227 KERNAL ROM REPLACEMENT ADAPTER)
*PCBWay community is a sharing platform. We are not responsible for any design issues and parameter issues (board thickness, surface finish, etc.) you choose.
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Hello Mr Eddie Bannister, I sent you an e-mail. Thank you.
Thank you very much C64iSTANBUL. I will report back as soon as I have build it.-
Hi Guys! I would be interested in a vic-20 char rom adapter too. They seem to be very hard to find
Hi Tuomas, C64Instanbul has actually made one. I requires a very small wiring modification to make to compliant with the way the VIC 20 addresses chips compared to the C64. I made one my self and had it running in a Vic 20 for over 3 hours no problems. It suits all Vic 20 mainboard variants. An extremely well layed out design. Of course it will fit the C64 as well. Here's the link https://www.pcbway.com/project/shareproject/CHARACTER_GEN__ROM_REPLACEMENT_ADAPTER_FOR_COMMODORE_VIC_20_and_C64.html You will need a very small wiring mod. Which if done carefully won't be noticeable. Here is a video of it working with the mod... https://youtu.be/f_DzuPC9OdU I will post something on my modification. I am hopeful that C64istanbul can incorporate the changes into his great PCB design. I'll get back to you....
Thank you very much Mr Eddie Bannister, I am very happy about your interest. This can be used for basic rom, but character rom is 4KB. Later I will draw a PCB for it, for multi language users. You can look at the image below. I like attractive colored jumpers, I agree you, you are right about them :) Thank you. https://www.commodore.gen.tr/forum/index.php?action=dlattach;topic=17182.0;attach=31270;image
I think your project is fine the way it is... Here's what to do regarding the CHAR ROM image...... Download a free windows program called HJ Split (you can do it from the windows command line- it's built in) to concatenate 2 x 4kb CHAR ROM files together. Now you have a an 8KB ROM image you can use in the E/PROM without messing up the ROM table jumper locations... This has been tried and I can confirm it works 100%.... https://hjsplit.en.softonic.com/ds ... Alternatively ... http://tech.guitarsite.de/eprom_image_multi_bin.html ........If you incorporate this project to C64iSTANBUL's COMMODORE 64 - KERNAL TABLE (901227 KERNAL ROM REPLACEMENT ADAPTER)...... https://github.com/svenpetersen1965/C64-Keyboard-Controlled-Kernal-Switch .........You have a non invasive way of changing the Kernal from the C64's key board....
Thank you Mr Eddie Bannister. You are right about CHAR-ROM image, But while moding C64 to multi language we need to change both kernal and character rom. Kernal table and character rom table need to be placed side by site. this kernal table will not fit double of it side by side, Pins on the PCB should to be drawn "some kind of mirored". . I know Sven Peterson, he is a good man, his project is better than mine, but I want to keep it simple whitout any SMD components. Thank you very much. :)
Interesting. If you maybe say place an empty socket under one of the ROMS would that give enough lift to clear the 2 adapter boards placed side by side?
You are right, It may be a good solution worth trying. Thank you.