Author
| a pc floppy in a 8245
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OeiOeiVogeltje
msx freak
Posts: 138 |  Posted: July 13 2007, 22:25 |
it has been asked before i know
searching the forum hasnt provided me with a good answer though
i have built a cable on these specifications
http://www.msxarchive.nl/pub/msx/mirrors/hanso/hwmodsetc/tech-nms8245fdd.pdf
i have measured the cable for the right connections
and all are good connected
the floppy does "all" its supposed to do except "spin"
so LEDs go on at startup and on "files"
on startup the drive spine just for a second and then it stops
spool L2 is replaced with wire
i made 3 cables and all have the same "problem"
i tried 4 pc drives two of which came from a working 8255
and i also tried it in another 8245
who knows whats wrong???
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Sonic_aka_T
msx guru
Posts: 2261 | Posted: July 14 2007, 09:53 |
Does you drive use 12V and if so, did you hook it up correctly? Did you set the drive to DS0? Does the drive have a disk-ready sensor? If it's an older drive, does it maybe require more current than the 8245 supplies?
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OeiOeiVogeltje
msx freak
Posts: 138 | Posted: July 14 2007, 11:01 |
as i said
they come from a working 8255
bas kornalijnslijper put them in
i dont know what you mean with "disk ready sensor" none of the articles i read talked about that
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jltursan
msx professional
Posts: 830 | Posted: July 14 2007, 12:54 |
"Disk ready sensor" means, more or less, that you must shortcut to ground the drive pin 34 (usually pins 34 & 33 must be joined). Also you can get the DS0 setting swapping pins 10 & 12 (and I'm always talking from the ribbon perspective); this last mod is not necessary if you can work with a B: unit instead the most common A:
Apart from that there're no other problems, recently I've been trying some new drives for my adapted 8245 and all work fine. Can you post the wiring of your cable?
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OeiOeiVogeltje
msx freak
Posts: 138 | Posted: July 14 2007, 13:10 |
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jltursan
msx professional
Posts: 830 | Posted: July 14 2007, 13:36 |
That's the same guide I'd follow to make my mod!. Here're some photos of my adapter:
General view
Adapter close-up
Using an old PC motherboard floppy connector I was able to keep the original cable...
The only modifications I can remember are the already mentioned, 10 & 12 swapping and the 34 & 33 shortcut (try this). If it still refuses to work, maybe the +5V line of your machine is not giving enough power, try to power the drive using an external psu with 5VDC and at least 1Amp.
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OeiOeiVogeltje
msx freak
Posts: 138 | Posted: July 14 2007, 14:16 |
ehmmm
who is that?
and i tried the psu thing too
the shortcut ill have to try
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OeiOeiVogeltje
msx freak
Posts: 138 | Posted: July 14 2007, 17:12 |
thanks ill try that tonight
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OeiOeiVogeltje
msx freak
Posts: 138 | Posted: July 15 2007, 17:45 |
that wasnt it either
i have several jumpers on the pc drive
RY -> ready i presume
DC -> Disk change i presume
DS 0 through 3
M1 M2 -> dunno what that is
IFHD-> dunno what that is either
which should be the right jumpers???
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monant
msx novice
Posts: 31 | Posted: July 16 2007, 22:34 |
I dont know if it can help.
is pin2 of the pc diskdrive connected to 5v?
pin2 should be (density select 720k / 1.44 Mb)
this is the configuration in my NMS8245
i changed the original drive after it burned with a pc drive years ago
i recently tried another disk drive and it works too.
i didnt open the drive and didnt make any modification like soldering /disoldering to configure it as ds0.
and it has been working for years
My drive work as drive A ( I swapped pin 6 and pin 7)
msx connector / diskdrive connector
1 index 8
2 dirc 18
3 step 20
4 w data 22
5 w gate 24
6 ds0 12
7 ds1 10
8 side select 32
9 nc 4
10 motor on 16
11 gnd
12 tr00 26
13 wp 28
14 rdata 30
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OeiOeiVogeltje
msx freak
Posts: 138 | Posted: July 16 2007, 22:49 |
thanks for your answer
pin 2 is connected to pin 18 (like in the PDF)
only thing i havent tried is switching pin 6 and 7
but still ; shouldlnt the drive work on "files "b:""?
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monant
msx novice
Posts: 31 | Posted: July 16 2007, 23:04 |
it could be strange but mine works on files "a: ,
i forgot to tell you that I also have an external 5V power supply for the drive.
About pin 2 I mean diskdrive Pin 2 !!!
(Pin2 of msx connector is connected with pin 18 of diskdrive of course)
as for the rest my configuration above does not differ from the pdf
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OeiOeiVogeltje
msx freak
Posts: 138 | Posted: July 16 2007, 23:23 |
eh?
from the 8245's with pc drive i have seen none use an externeal powersuply
and 5 volts to pin 2?
it doesnt say that in ANY documents regarding this modification?
where did you get this information?
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monant
msx novice
Posts: 31 | Posted: July 16 2007, 23:26 |
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OeiOeiVogeltje
msx freak
Posts: 138 | Posted: July 16 2007, 23:44 |
5 volts to pin 2cis for turbr only as far as i can see
only thing i didnt try yet is switching pin 6 and 7
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