NMS8280 problems

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By Gregory

Master (177)

Gregory's picture

25-02-2014, 18:52

Yes you are right, I should have paid more attention.

By bakoulis

Master (166)

bakoulis's picture

26-02-2014, 01:45

Daemos wrote:
Quote:

About the FDD B, probably needs a new belt.

nms82xx drives have direct drive. No belt in there Wink

I have all the models of nms82xx series and all have belt drives.
Probably yours have a PC modified drive.
Wink

I want some day to replace all my original Philips belt drives with PC modified, to save myself from the hunt of belts!



By Manuel

Ascended (18082)

Manuel's picture

26-02-2014, 10:02

I think he meant that 825x don't have belt drive. 8245 for instance definitely has belt drives like you showed.

By Jipe

Paragon (1499)

Jipe's picture

26-02-2014, 11:14

in 8250 55 and 80 you have the same Mitsumi drive that in SONY HBF700F but is black , and no belt sure

By Gregory

Master (177)

Gregory's picture

26-02-2014, 11:28

I took a look at mine (8280) and they are Mitsume 357 en there is no belt.

By Jipe

Paragon (1499)

Jipe's picture

26-02-2014, 11:45

this model of drive warm and the upper head to decole with time

for testing insert a floppy and format in 1DD mode (360k)

if done and 2DD mode not ok the upper head is dead , no issue

By bakoulis

Master (166)

bakoulis's picture

26-02-2014, 12:49

All that years I believed that my 825xs have belt drives like the 8235/8245!
This because many people have replaced the MSX drives with PC modded drives.
I am happier now. My 825xs don't needs the PC replacement drives!
I have to replace only my 8245 disk drive (8235 already have replaced with a PC 720K).
Smile

By Gregory

Master (177)

Gregory's picture

27-02-2014, 16:29

I took a few pictures of the main board and the PCB circuit:




The extra PCB circuit connects to:
IC 134: pin 2,3,15,17
IC 133: pin 2,3,4,5,15,17
IC 146: pin 4,7,9,12
IC 147: pin 4,7,9,12
IC 150: pin 8
IC 149: pin 3,6,7
IC 131: pin 1
IC 111: pin 2
IC 149 pin 3 connects to IC 161 pin 11
Blue wire beneath IC 139

By Manuel

Ascended (18082)

Manuel's picture

27-02-2014, 16:27

Gregory wrote:

Memory Mapper: slot 3,2; 256k size

So you do have expanded memory in it. That was clear, right?

By Gregory

Master (177)

Gregory's picture

27-02-2014, 16:31

I don't understand what memory expansion it is.
Seems to me it only interact with 2 RAM IC's 133 and 134.
I thought to get the 256 you would have to place 4 extra IC's in parallel with the existing ones?

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