Closed SwitchLess Multirom for C64 Breadbin

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tony1999it

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The multirom can store 2 images (e.g. dual kernals roms, dual character roms...)

The selection of the images is done without an external switch !!!

At the boot the multirom starts with the default image. If you want to start with the secondary image it's enough to hold the RESTORE key during the boot ... easy!

You can change the default image at the boot with the minijumper installed on the multirom.
So with the jumper you have:
Image A (default)
Image B (with RESTORE pushed)

with the jumper removed:
Image B (default)
Image A (with RESTORE pushed)

If you are not interested in inverting the default image it is possible to configure the eprom with 4 images.
In this case with the jumper installed you have:
Image A (default)
Image B (with RESTORE pushed)

with the jumper removed:
Image C (default)
Image D (with RESTORE pushed)
Let me know your desidered configuration ...

In order to operate it's necessary to solder two wires on two points of the moderboard.

The wire A goes to the RESTORE signal from the keyboard.
The wire B goes to the reset signal of the CPU (pin 40).
See the picture for the exact points to solder the wires.


If you are not confident with the solder iron please ask to a good friend or avoid to order this multirom.


PM me for the desidered image configuration .


The multirom will be shipped already programmed and tested!

Several items available!!
€ 15 /each + p.p.

Payments with Paypal as a gift.

p.p. to Italy
- € 5.00 with signed-for mail;
- € 2.00 with priority mail (no traking)

p.p. to other European destinations:
- € 6.50 with signed-for mail;
- € 3.00 with priority mail (no traking)

p.p. to other destinations please ask.
Advertised elsewhere.


DSC_0784_zps43e30aab.jpg


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DSC_0782_zps075eacbf.jpg
Solder Point for wire A

DSC_0783_zps16b32451.jpg
Solder Point for wire B

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The switchless multirom with the PLA and the Swinsid on my C64!



 
Last edited:
Did you get the idea from here:
http://pasilassila.blogspot.fi/2014/06/switchless-jiffydos-for-c64.html
I'm making a small upgrade. The next version will have optional reset. The machine resets if you press the Restore-key for over 2 seconds.

The idea come from here http://sleepingelephant.com/~sleeping/ipw-web/bulletin/bb/viewtopic.php?f=11&t=4804
... but you also did a great job.

I used high integrated smd components on a EPROM adapter already developed by myself: https://www.amibay.com/showthread.php?53857-Commodore-64-and-1541-ROM-replacement-module

Interesting your idea of the C64 reset holding down the RESTORE key ...
Could be done easly with an electrolitic capacitor and a resistor ... I'll try to propose a solution.
 
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