V64_Jr_Cart_Backup_V1.0b_(Blackbag)

@Nintendo64

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 · 4 years ago

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    ³ BlackBag Presents -               JRBACKUP v1.0b 
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    ³ Coded By:  Datawiz        Date: January 17, 1999 
    ³ Type:      N64/PC Util    BEVERAGE: Mt Dew 
    ³ 
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    ³ 
    ³ Release Notes: 
    ³ 
    ³ This dos program will allow you to backup cartridges with the 
    ³ Doctor V64jr device from Bung.  Operate this utility as you 
    ³ would any dos based program.... Just run it. 
    ³ 
    ³ If you run into any problems with it, please email me at 
    ³ datawiz@blackbag.org with SPECIFIC information on your problem! 
    ³ 
    ³ Also, look at the JRBACKUP.TXT file included with this archive 
    ³ for more information. 
    ³ 
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    ³ 
    ³                                                               eof 

JRBACKUP.TXT

 
JRBACKUP v1.0b - Coded by Datawiz of BlackBag 

Thanks to: LaC, Titanik, Sage, and FoxMcCloud for support and testing. 

This little program will allow you to finally backup cartridges 
using the v64jr from Bung.  Simply run it from a dos prompt, 
and follow the instructions.  One small thing to remember: 

                    *** IMPORTANT *** 

In order to successfully back up a cartridge, it must be plugged 
DIRECTLY into the v64jr.  Be sure to remove ANY device that may 
be sitting inbetween the cart and the jr ( DS1, DX256, GameShark, 
thermonuclear detonator, etc. ). 

This version of the backup rom will ONLY backup cartridges with 
"standard" 1st generation bootcodes.  This covers a vast majority 
of carts on the market.  The next version will allow backing up 
of the "nonstandard" carts (i.e. yoshi, 1080, zelda).  When the 
program instructs you to turn on the N64, you should immediately 
see the screen turn white.  If you see no such screen, then the 
cart is nonstandard.  If the screen turns white, then eventually 
turns black again, the program is functioning correctly. woohoo. 

If you find a bug or have a problem, you can email me at 
datawiz@blackbag.org .  Beware, I have an itchy delete button 
finger, so please make your email intelligent. 

------- 
No N64 Devkits or Libraries were harmed during the programming of this 
utility.  It is written in 100% assembly on the N64 side. 
------- 

 
To Do List: 

. Port to linux 
. Support for nonstandard bootcodes 
. SRAM/EEPROM backup and restore 
. DS1 Management 
. Pick up milk, bread, and...errr, wrong list 

 
Technical Notes: 

Why must we use the N64 to backup a rom?  Well, because of the way the v64jr 
was designed, the Cart is not _directly_ accessable from the PC.  The 
v64jr can only map the Cart to the N64 memory space, giving an N64 program 
access to the Cart.  To make matters even more complicated, you must use the 
PC to tell the v64jr to map the Cart accordingly... :) 

Now that you know why the N64 is used to backup the cart, we can now 
understand what happens. 

PC program tells the JR to map cart to N64 memory, and make DRAM writable 
PC program uploads a small N64 rom to the jr -- user turns on N64 
    This rom dmas (hardware memory copy) the cart at (starting at 0xb4000000) 
    to N64 RDRAM (0x80200000) in 2 megabyte chunks.  Then the N64 program 
    dmas the data over to the Jr's DRAM (starting at 0xb0000000).  This 
    process continues until the entire rom is copied. 
PC program is told that rom backup on the N64 is finished 
PC program downloads the rom from the JR to the PC 

Now, since using the N64 is how we get a cart backed up, there is a 
problem with nonstandard bootcodes in roms.  Unfortunately, there is 
no proactive approach to fixing this.  If a new cart comes out, the 
only way to back it up on the jr is to copy the bootcode from an 
already backed up image.  Then use the bootcode in the backup program. 
This is why some carts will not work with this program (1080, Yoshi, 
Zelda). 

-- Datawiz