Re: 8250 and C64 disks

From: Claus Just Rasmussen (Claus_at_just-rasmussen.dk)
Date: 2006-04-17 14:48:11

Hi Nicolas,

Nicolas Welte wrote:
> Nicolas Welte wrote:
>> I will have a look at your nasty file creation problem. Did you try to
>> specify a filename without a path, so the current directory is used? 
>> I also
>> had no trouble when the current directory was in e.g. c:\diskimage and I
>> called the program from there, e.g. "c:\bin\imgrd testdisk".
>
> The problem was caused by having only 8 character reserved for the 
> filename. You are supposed to enter only the name, without a path or 
> extension. The extension is added automatically based on the disk type.
Aahh. OK. Yes, I did specify a path and/or extension - I don't think 
that I ever tried without either. No big problem, but it's nice to have 
it fixed anyway. Thanks!
>
> I "fixed" this and you can now specify a path as well. The version can 
> be downloaded here: http://people.freenet.de/x1541/IMGRD.EXE
>
> I had a look at the 4040 problem as well. It seems I use a ROM vector 
> that does not exist in the 4040 DOS. I will have to rewrite my code to 
> use RAM variables directly, because the RAM locations are equal enough 
> in all dual drives. At least I hope so.
OK. I don't know about the differences, but it surely makes sense to 
presume more ROM than RAM changes in between the two. Crossing fingers :-)
>
> I also tried to repair my 4040, without success so far. I checked the 
> following:
>
> 1. repaired power cable
> 2. 3 blinks. $E DOS ROM bad, replaced.
> 3. 5 blinks. checked 6504 (swapped with a printer). checked 6530 
> (swapped with SFD1001), even made a 2716 EPROM for the adaptor board 
> from the SFD. No success.
>
> Does anyone have an idea what can cause 5 blinks on a 4040 besides the 
> disk controller CPU (6504) and RAM/ROM (6530)?
I just checked my old manuals. No info about that =:-O

//Claus
>
> Nicolas
>
>
>
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>
>

-- 
------------------------------------------------------------
Claus Just Rasmussen, BSc.EE.
www.just-rasmussen.dk
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