JiffyDos from the ground up

Andrew Wiskow · October 05, 2008, 08:21 AM

Quote from: airship on October 05, 2008, 08:20 AM
Yeah, Charles is the guy. I emailed him a couple of days back and am waiting for a response.

hehehe... You're one step ahead of me then!

RobertB · October 05, 2008, 03:12 PM

Quote from: airship on October 05, 2008, 08:20 AMI emailed him a couple of days back and am waiting for a response.

E-mail him again. Charles has a lot on his mind these days and may be preoccupied.

In Los Angeles,
Robert Bernardo
Fresno Commodore User Group
http://videocam.net.au/fcug
The Other Group of Amigoids
http://www.calweb.com/~rabel1/

Doppie1200 · October 07, 2008, 09:01 PM

Anyone have experience with putting jiffydos in the DCR?
I have downloaded the said bin files but I am unsure how to proceed.
There are two roms U32 and U34 for the C128DCR and the U102 for the built in drive.
But what is in U32 and U34? My goal is to have a ROM switchable between jiffy and original for both C64 and C128 mode.
For educational purposes ofcourse.

Thanks.

RobertB · October 08, 2008, 02:06 AM

Quote from: Doppie1200 on October 07, 2008, 09:01 PM
Anyone have experience with putting jiffydos in the DCR?

Yes, I have two DCR's with JiffyDOS. Because I've misplaced the instructions, I'll have to crack one of them open and look inside.

Truly,
Robert Bernardo
Fresno Commodore User Group
http://videocam.net.au/fcug

Andrew Wiskow · October 08, 2008, 04:33 AM

The 128DCR has a chip with the combined kernals for 128 and 64 mode, and then another chip for the 1571D. To install JiffyDOS in the 128DCR, I remember that you install a chip with a switch for the kernal ROM, and another chip with no switch for the 1571D. U32 is where the combined kernal ROM goes. U34 is for the BASIC ROM (you don't want to change that). U36 is the socket for the optional function ROM. You're right, U102 is where the ROM for the 1571D goes. Just make sure you use JiffyDOS for the 1571D and not for the standard 1571.

RobertB · October 08, 2008, 04:57 AM

Quote from: Andrew Wiskow on October 08, 2008, 04:33 AMU32 is where the combined kernal ROM goes. U34 is for the BASIC ROM (you don't want to change that). U36 is the socket for the optional function ROM. You're right, U102 is where the ROM for the 1571D goes.

Ah, thanks for that. Now I don't have to open up one of my DCR's (not with a starship sitting on top of one!).

Truly,
Robert Bernardo
Fresno Commodore User Group
http://videocam.net.au/fcug
The Other Group of Amigoids
http://www.calweb.com/~rabel1/

Andrew Wiskow · October 08, 2008, 05:03 AM

Quote from: RobertB on October 08, 2008, 04:57 AMAh, thanks for that. Now I don't have to open up one of my DCR's (not with a starship sitting on top of one!).

I can see how a starship might get in the way.

Still, I think the 128DCR is the easiest of all the Commodore computers to open up... They really hit a home run with the design on that one.

Doppie1200 · October 08, 2008, 05:07 PM

Ok, so I get an image of the original 256kbit U32 ROM, append a C64 Jiffy + C128 Jiffy and burn it all to a 512kbit ROM. Or is it the other way around? Should I append the C128 jiffy + C64 jiffy. I don't know how the ROM is organized.

Thanks.