Wanted MegaSTE DMA Chip

[UnderTheRain]

Hi

TLDR : I am looking for a DMA Chip for a MegaSTE the C398789-001 however the Mega uses a 44pin QFN (PLCC) IC soldered to the main board not the 40 pin dip as suggested on eBay.

Not TLDR : lol

I realise that these are going to be super rare I've been having a bit of a mission trying to get a MegaSTE up and going. I purchased one that after a short time blew up blowing the PSU and leaving the Mainboard with a 5v to 0v short some where (also I noticed when I was looking at it that the main board was physically damaged by the ram it originally had 2MB in the damage might be why). Anyway I managed to find another motherboard on eBay with a PSU it arrived but real life intervened and I had to shelve the project without even opening the package. When I came back it and opened it that motherboard also has been physically damaged and it was missing the drive controller. Looking for parts I found a Mega at an OK price so I bought that one which seemed OK initially but it had instability around hard disk access. Thinking it was the drive I purchased a BlueSCSI/HDDriver turns out its not the drive :D meh. I managed to repair the second damaged PCB and have put it back in the original machine and that one at least seems to be working fine I still have some clean up to do but fingers crossed it will be ok, as of the second one I bought another controller card off eBay because plugging something in is easier that reworking the surface mount (well tbh that's my day job so it's pretty easy lol) and nooo that controller was totally dead luckily the seller is going to return it for me. I've got a new CPU coming and I just got the recap kit of Exxos and so that leaves me looking for a DMA. I could take one off the blown board but since it's damaged and blown up I'd rather try and find one that more likely to work (I will try it as a last resort). If anyone has one lying around they could part with I you could message me and we can make a deal that would be awesome.

By the time I'm finished one machine will of had a new mobo/psu, TOS 2.06UK new controller card, new rtc battery, (maybe a BlueSCSI as I bought 2 it will keep its original drive for now) cleaned up with new leds as they both have a lot of rust on them. The second one will have had a BlueSCSI + HDDRiver and new CPU, recapped PSU, new RTC Battery, TOS 2.06UK and again the same clean up and if I can find one a replacement DMA.

To top it both my SC1224 and SC1435 failed within the last two weeks. Can anyone recommend anyone that's good at fixing monitors? I have a transformer for the SC1224 and am looking for the same for the 1435. I did buy a DELL P2214HB that works perfectly in low, med and high res (you can change the aspect ratio if you want or have it widescreen both are usable) you can get them on ebay atm at £30-50 for anyone wanting a monitor (they are VGA and I'm using one of those little ST to VGA adapters with the switch on £12.99 on eBay.

Thanks Sorry for the ESSAY :D.

[UnderTheRain]

Oh if anyone is fitting a BlueSCSI into a MegaSTE is made two versions of a caddy/tray that fits inside the original chassis its over on thingiverse thing:6989116

Thanks

[haelix]

Hi, It would be super rare a chip if it had only been sold in MegaSTE / TTs. But given that some STE motherboards out there have it... let's say it's only "somewhat rare".

[HigashiJun]

I should have one in my parts box...

[mikro]

Interesting. I've got at least two MegaSTEs which use the DIP version.

[UnderTheRain]

I have 3 Mega Boards here and they're al the QFN style IC I didn't know that the QFN was used in the regular STE I've only ever seen DIP version.

[UnderTheRain]

I have 3 Mega Boards here and they're all the QFN style IC I didn't know that the QFN was used in the regular STE I've only ever seen DIP version with the same serial number.

[HigashiJun]

@UnderTheRain

This is the chip I have:

DMA.JPG

[UnderTheRain]

yeah that's the one I'm looking for if you have one spare I could buy off you I'd really appreciate it.

Regards

Brian

[HigashiJun]

yeah that's the one I'm looking for if you have one spare I could buy off you I'd really appreciate it.

Regards

Brian

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