Re: Data Becker CBM-8000 hi-res graphics

Steve

Another very brief look in the code there appears to be a lookup table from 9CC6 which if convert to ASCII refers to some of the special drawing characters (lines/corners etc) - the table gets analysed from code that starts from around L_991A:
onwards which is looking at a Keypress for some reason
B6 B4  B8  B2 B9 B7 B1 B3  B5 B0 AE AD etc.

Any ideas as wonder what the purpose/application this board was designed for ?

Andy



> On 28 Aug 2017, at 17:34, Steve Gray <sjgray@rogers.com <mailto:sjgray@rogers.com>> wrote:
> 
> Preliminary look at the ROM. At the start there is a giant jump table, so it looks like all the commands will be via SYS.
> so:
> 
> SYS to $9000, $9003, $9006 etc to see what happens. If you get syntax errors then you know there must be additional parameters IE: SYS $9000,X,Y etc
> 
> An interesting board for sure.
> 
> Steve
> 
> 
> From: vossi <vossi@ceffy.de <mailto:vossi@ceffy.de>>
> To: cbm-hackers@musoftware.de <mailto:cbm-hackers@musoftware.de> 
> Sent: Monday, August 28, 2017 10:16 AM
> Subject: Re: Data Becker CBM-8000 hi-res graphics
> 
> Hi Ruud and Steve,
> it doesn't look like the supersoft board.
> It's only the 6545 with some ttl's to access bitmap graphics instead of the
> prebuild chars and the 16kb ram board.
> I read the eprom and disassembled it short in the monitor.
> It runs at $9000 and has several jumps for a lot of graphics subroutines in
> the first bytes.
> I think at $9000 is the init routine.
> 
> Here are pics: 
> http://www.ceffy.de/cbm8000-grafik_001.jpg <http://www.ceffy.de/cbm8000-grafik_001.jpg>
> http://www.ceffy.de/cbm8000-grafik_002.jpg <http://www.ceffy.de/cbm8000-grafik_002.jpg>
> 
> And the rom-extension: http://www.ceffy.de/cbm8000.bin <http://www.ceffy.de/cbm8000.bin>
> 
> @Ruud: Please send me the disassembly to vossi@ceffy.de <mailto:vossi@ceffy.de>
> 
> Has anybody a 6502 disassembler for OSX ?
> I tried DiStella - it works - but it's VCS2600 specific....
> 
> greets
> 
> 
> 
> 
> --
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