Help with a floppy disc
| # | Post |
|---|---|
| 51 | https://trademe.tmcdn.co.nz/photoserver/full/1600244854.jpg differentthings - 2021-08-30 18:08:00 |
| 52 | https://trademe.tmcdn.co.nz/photoserver/full/1600244854.jpg differentthings - 2021-08-30 18:08:00 |
| 53 | https://trademe.tmcdn.co.nz/photoserver/full/1600246655.jpg differentthings - 2021-08-30 18:09:00 |
| 54 | Can you find any SIMM ram boards on the motherboard? If you can find some I might be able to help you out. tygertung - 2021-08-30 19:00:00 |
| 55 | Is the mother board the one on the bottom? differentthings - 2021-08-30 19:05:00 |
| 56 | differentthings wrote: So, referring to the self-test picture you posted from the manual, which of the items in the picture are listed as 'Failed' rather than 'Passed'? gyrogearloose - 2021-08-30 19:49:00 |
| 57 | I wondeed that also. They all say "passed". nice_lady - 2021-08-30 19:55:00 |
| 58 | The one in the red differentthings - 2021-08-30 20:05:00 |
| 59 | tygertung wrote:
differentthings wrote:
This photo shows the memory, the 4 big chips along the middle are AM9128 memory chips, 2048 x 8 static ram. gyrogearloose - 2021-08-30 20:06:00 |
| 60 | nice_lady wrote: differentthings - 2021-08-30 20:08:00 |
| 61 | https://trademe.tmcdn.co.nz/photoserver/full/1599979275.jpg differentthings - 2021-08-30 20:10:00 |
| 62 | gyrogearloose wrote: differentthings - 2021-08-30 20:15:00 |
| 63 | Life before the computer: A cursor used profanity. A keyboard was a piano. A web was a spider's home. A virus was the flu. A CD was a bank account. A hard drive was a long trip on the road. A mouse pad was where a mouse lived. And if you had a 3 1/2 inch floppy..... you just hoped nobody found out. mazalinas - 2021-08-30 20:33:00 |
| 64 | mazalinas wrote: differentthings - 2021-08-30 20:40:00 |
| 65 | Ok one of those pictures shows what appears to be a red error. It looks to be not in English tho? So I'm don't know but it *could* be a memory error ? Or? And from the photos I can't identify ram. It'll be there somewhere. Edited by nice_lady at 9:07 pm, Mon 30 Aug nice_lady - 2021-08-30 21:06:00 |
| 66 | Ah yeah now I get out. Compare the 'real' pic to that of the manual does indeed suggest it's a ram stick problem. nice_lady - 2021-08-30 21:09:00 |
| 67 | What dose a ram look like lol differentthings - 2021-08-30 21:38:00 |
| 68 | It's not English. The ALT changes the language but it won't let me change it. Also only about a 1/3rd of the letters work on the key pad correctly. About a 1/3 give you some random combination (pressing Z gives you a C etc) Edited by differentthings at 9:43 pm, Mon 30 Aug differentthings - 2021-08-30 21:42:00 |
| 69 | According to the manual the red error is a CRT coram problem. differentthings - 2021-08-30 21:46:00 |
| 70 | It appears to be the video buffer, that's what C0 1, 2, and A are according to that manual page, CRT So on the board labelled colour monochr I'm thinking that your C0 C1RAM error probably corresponds to chips U13 and U16 which are old static ram chips, these are fairly robust, when in circuit. It could just be corrosion, a simple pull clean and reseat. However these are CMOS chips and able to be destroyed with static when not in circuit so really should be only pulled by someone experienced/equipped. I thought it was an S-100 bus machine but then counted them, 86 not 100, I know of no 86 pin backplane system so its very likely a proprietary machine. Its very fixable, you just need to find someone good that can do board level repair, NOT a module jockey, they will screw it up. ronaldo8 - 2021-08-30 22:11:00 |
| 71 | differentthings wrote:
Yup ronaldo8 - 2021-08-30 22:11:00 |
| 72 | You should pull all the cards, clean the gold fingers with something like isopropyl and see how you go. PS (let them dry properly) ronaldo8 - 2021-08-30 22:15:00 |
| 73 | Oh it's from the 80s? Wow. On the bright side the CPU still works but looks like the video board is messed up. Without a circuit diagram it's a lot of work to debug. It might be worth seeking out some replacement salvaged boards from the US. drsr - 2021-08-30 23:16:00 |
| 74 | Reseat the ram chips on the video card. Use a pick and just slightly lift one side and then push it back down from the end. Then do the other side. Don’t scrub the headers just reseat the cards back into back plane nice and snug. After doing that see if it will run. If your real confident switch U13 with say U16 and see if the fault moves. That would be the very first thing I would do Edited by shakespeare6 at 7:32 am, Tue 31 Aug shakespeare6 - 2021-08-31 07:29:00 |
| 75 | That would prove the chip- it may have simply failed. There is not to much that can go wrong. Other than a bad connection on a pin they look to have a common oscillator reference. As the other 3 test ok you could assume the reference and voltage rails are all good. The bus interface would be the physical tracks so not a could go wrong with that part of it. Edited by shakespeare6 at 7:55 am, Tue 31 Aug shakespeare6 - 2021-08-31 07:53:00 |
| 76 | If the disc is floppy just tell it to harden up. leson - 2021-08-31 08:17:00 |
| 77 | In case nobody else has mentioned it; this thing is very old school with CRT and high voltage circuits. That makes it it dangerous enough that should be electronics tech look at it and not the OP. Interesting bit of kit, but if it is a proprietary dedicated hardware for wheel balancing that is 30-40 years old, then you either need somebody who can diagnose and replace individual ICs/capacitors or OP looks and replacing the the entire thing. gblack - 2021-08-31 08:28:00 |
| 78 | Thanks for all the advice. I don't know how you guys and girls can get so much information just by looking at the photos. It's way above my skill level mucking around with electronics. differentthings - 2021-08-31 09:21:00 |
| 79 | If the OP is a handy sort of person who is building race cars, they should be wide awake enough to be careful of the CRT and high voltage circuits if they are told it could be a hazard. If you are removing chips, circuit boards on the motherboard etc, ensure you ground your body by touching your hand to part of the metal chassis, this will remove static from your body. tygertung - 2021-08-31 09:22:00 |
| 80 | Yeah. I've stayed away from the CRT board and the power board. The ones that I've posted photos of look pretty harmless. differentthings - 2021-08-31 11:09:00 |
| 81 | shakespeare6 wrote: differentthings - 2021-08-31 11:16:00 |
| 82 | anyway, I've decided that everyone has spent way to much time on this so will just give up on it I think and move on. differentthings - 2021-08-31 12:13:00 |
| 83 | differentthings wrote:
I see you are in BOP, when we are back in L2 bring it over to Rotorua- we have an electronics workshop here - I will have a quick look at it for you no trouble. I would hate to see you bury it yet when its in a close to running state. shakespeare6 - 2021-08-31 12:40:00 |
| 84 | shakespeare6 wrote: differentthings - 2021-08-31 13:44:00 |
| 85 | shakespeare6 wrote: nice_lady - 2021-08-31 13:55:00 |
| 86 | I"ve got your number shakespeare6 - 2021-08-31 14:47:00 |
| 87 | Not mine lol nice_lady - 2021-08-31 14:54:00 |
| 88 | differentthings wrote:
Same chip, different production run is all. Identical. One made in August 93 the other March 94 I believe. Edited by ronaldo8 at 3:25 pm, Tue 31 Aug ronaldo8 - 2021-08-31 15:19:00 |
| 89 | ronaldo8 wrote: differentthings - 2021-08-31 16:22:00 |
| 90 | Just remove one. See if it starts without error. If it doesn't, put it back. Remove a different one. Process of elimination. Edited by nice_lady at 4:40 pm, Tue 31 Aug nice_lady - 2021-08-31 16:39:00 |
| 91 | No ok. Will try that ad well. At work for the rest of the week so won't be until Sunday before I get to play with it again. differentthings - 2021-08-31 19:13:00 |
| 92 | so, did you get it working ? ajamrg - 2021-09-17 15:52:00 |
| 93 | LOL oh dear, that machine is just about as old as me. Someone that knows how to decompile the disk may be able to rebuild it. mrfxit - 2021-09-17 19:08:00 |
| 94 | I don't think it was ever ascertained that the disk is the problem. More likely faulty ram? nice_lady - 2021-09-17 20:04:00 |
