Re: Eprom Burning successful!!!

On Jan 13, 8:37 am, ramswell <shifty_bu...@xxxxxxxxxxx> wrote:
  Well I finally got around to burning my first KeyDOS Eprom and it
came out PERFECT!

   So I guess I'm now taking orders for eprom burning....... ;)

   Charles

   http://www.8bitdesigns.ath.cx

Hey Charles, are you using a commie based programmer, or a PC based
programmer ???

this is what I have found out, as I use a PC based programmer, if you
have ROM files that you have dumped on a commie, and use Star
Commander to transfer the files to a PC, then you have a problem,
commodore always stores the load address as the first two bytes in a
file, well SC does not remove this when you Xfer the file to a PC, so
you have to ommit the first two bytes when loading into a PC based
programmer, I used the editor in my PC programming software to simply
shift the file backwards by two bytes, so a 8K eprom file is 16386
bytes when Xfered from Star commander, then I shift the file from lets
say address $1002 thru $5002 back to $1000, and then re-save the file,
this removes the load address out of the CBM file. Now if you have
access to the REAL eprom, then this is not a problem, you simply read
the file on the PC's eprom burner. the shift address is based apon
your load address in the PC eprom software, mine is a old 4 slot DOS
based burner from back in the late 80's. Works fine with 2732's thru
27c512's

Took me a while to figure out why my eproms were not burning
correctly, hell the burner is so old I have to go into the CMOS bios
setup and turn the external cache memory off, to slow it down, to get
good eprom writes. It does the Job.

Nice to have my own personal Kernal, says who owns my C-64. and nice
white color cursor instead of light blue, and patched the tape
routines to do a load"*",8,1 instead of LOAD. Some old Jiffy Dos's
had light blue colored cursors, change this address to get nice white
color at address $E534 this is the real commodore address A9-0E,
change
this to a A9-01 for white cursor, instead of the light blue. the
Kernal is mapped from $E000-$FFFF so if you load the file at $1000
then you would change location $1535 from a $OE to a $01 to change the
light blue color to white.

another way is to move the ROM to RAM, go into a Action replay
monitor, or Snapshot, and then type * to switch to ROM mode, then do a
T E000 FFFF E000 this will transfer the ROM to RAM, then you can edit
$E535 from $E0 to $01
then do a S"FILENAME",8,E000,FFFF this will save your modified kernal
to disk. I changed the COMMODORE 64 banner to my name, so it says
*** THE BLUE BIRD'S C-64 *** kinda neat.

Look for the text in the rom and edit it to your like.

-BBP
.

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