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YE-DATA YD274 manual/schematic anyone ?

Z

zippysticks

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I could really use a manual for these full height 5 1/4 drives please.

I have them in my Research Machines 380Z but understand they may have been used in the IBM 5150 too.

Thanks
 
zippysticks said:
Found one http://archive.retro.co.za/archive/computers/YD-274-Schematic.pdf
Click to expand...
http://archive.retro.co.za/archive/computers/YD-274-Schematic.pdf
zippysticks said:
Not convinced that this schematic if correct for the YD-274 as the filename might suggest. It also does not seem to indicate how the motor enable signal gets through to the spindle motor itself. I have two of these drives that both seem to have failed in the same way - the motor does not spin despite the motor enable signal being provided.
Click to expand...
 
zippysticks said:
I could really use a manual for these full height 5 1/4 drives please.

I have them in my Research Machines 380Z but understand they may have been used in the IBM 5150 too.
Click to expand...
Привет! у меня есть два таких fdd. один удалось настроить на работу в системе XT. Со вторым справиться не могу. Во первых и пропаял все соединения на нижней плате и почистил контакты, идущие на большой разъем на верхней плате. Так же поставил jp на d0, hm и hs.
 
I found one of these also and was curious about getting it to work in a 5160. Any more info on this? My drive was spinning then stopped spinning completely.

Id like to know the jumper settings for a single sided drive on a 5150. Obviously ds0. The HM jumper was in there when I got it. What does that do? The other jumpers available and not used are MX and HS.
 
Might as well post some photos. Here is the board from the YD-274 single sided floppy drive.
IMG_20260603_201845.jpg

Everything seems to be off the shelf parts. Im not sure about the two YE-DATA MB14301 and MB4392 ICS. Are those proprietary?

You can see the jumper block. I have it changed to DS1 and HM was already in place. You can see the hard wires jumpers on the side. Only HL is jumped. Not sure what about these I need to change to work in a 5150

Closeup:
IMG_20260603_201943.jpg


Just found more hard jumper in the middle of the board. LR and IR. LR is soldered in place. PM and PS. None are soldered. R and N R is soldered in place.
 
Last edited:
Syndikated said:
I found one of these also and was curious about getting it to work in a 5160. Any more info on this? My drive was spinning then stopped spinning completely.

Id like to know the jumper settings for a single sided drive on a 5150. Obviously ds0.
Click to expand...
For an IBM 5150 and 5160, see [this]. The 5150/5160 expects that particular cable. The cable manipulates both the motor-on and drive-select lines.

Terminate as required, per [here].

HL is 'head load'. In the photos of post #6, on one side, the HL jumper is connected to pin 4 of J1. The stock IBM floppy controller in the 5150/5160 does not have anything connected to pin 4, and so the stock floppy controller cannot control head loading that way. But head loading can be done in multiple ways, and a different jumper, the HM jumper, is shown in the list at [here] as "Head loading controlled by the Motor On signal". So I think you should leave the HM jumper on.

So, to me, what is shown in the bottom photo of post #6 looks good (second drive-select, terminator in, HM jumper in) for the A: drive at the end of the special cable pointed to earlier in this post.

At [here] are some BASIC commands. Boot your 5150/5160 into Cassette BASIC, and then see if the applicable command in the 'TURN ON DRIVE's LED AND SPINDLE MOTOR' section results in described behaviour.
 
DcAex00,
Hi! I have two of these FDDs. I managed to configure one of them to work in an XT system. However, I can't
get the second one working. For starters, I resoldered all the connections on the lower board and cleaned the contacts
leading to the large connector on the upper board. I also set the jumpers to D0, HM, and HS.
Click to expand...
The PCB on these Drives are marked with D{0..3}, and for the IBM style both are strapped as DS1 and the twisted
conductor cable (10 thru 16) is used.

HM is Head Load with Motor ON
HS is Head Load with Drive Select
MX jumper stands for "Multiplex" (or "Motor Multiplex"), and it overrides normal motor-control behaviors so the
drive's motor runs continuously whenever the overall system is active.


Larry
 
Thank you both. Glad the drive is setup correctly! I am using the correct twisted cable. Turns out I have two of these drives and both seem to behave the same. I believe there is a fault and I am going to attempt to track that down next. Thank you again.
 
ldkraemer said:
You should not require the HS or HM jumpers as Pin 16 turns the motor on, and you have Drive 1 selected.
Click to expand...
From what I see, HS and HM is related to head loading, not motor turning.

For example, when I look at the circuit diagram of a different Y-E Data drive, the YD-380, I see:
HL: Jumper if HEAD LOAD (pin 4) is to load the heads.
HS: Jumper if DRIVE SELECT is to load the heads.
HM: Jumper if MOTOR ON (pin 16) is to also load the heads.

So with nothing coming in on pin 4, surely either HS or HM has to be jumpered in order for head loading to occur.
 
Wow, look at all those beautiful Hitachi 74LS logic chips and some other types there probably OTP types, programmed by YE Data. On those pcb's I would not worry about faulty chpis, more likely the Blue Tant caps.
 
Hugo Holden said:
Wow, look at all those beautiful Hitachi 74LS logic chips and some other types there probably OTP types, programmed by YE Data. On those pcb's I would not worry about faulty chpis, more likely the Blue Tant caps.
Click to expand...
Way ahead of you! I was thinking the same thing and have some tantalums on order.
 
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