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In need of CorComp FDC pics...


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#51 pcoderdude14 OFFLINE  

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Posted Sat Jan 13, 2018 9:59 PM

If you get to the point where you need some new EPROM DSR chips, FYI I have both originals and MG upgrades.I also have a mod that removes DSK4 permanently (if you have a RAMdisk designated as such).

 I would be interested on getting a "set"  of these chips from you.  Could you please contact me , thru email, at >jstimatz2015@yahoo.com< to discuss this more ...

 

Thanks...

 

Jt



#52 marc.hull OFFLINE  

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Posted Sun Jan 14, 2018 3:37 PM

The possibilities with the highest likelyhood are.

1) 9901 has issues. It can be replaced easily and might clear things up.

2) your PALs are cooked which means your card is bricked until someone goes sherlock on a good one so they can be replicated.


All of the card decode is done in the PALs. It sounds like your address line decode has gone haywire.

Good luck.

#53 RickyDean OFFLINE  

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Posted Mon Jan 15, 2018 7:20 AM

The possibilities with the highest likelyhood are.

1) 9901 has issues. It can be replaced easily and might clear things up.

2) your PALs are cooked which means your card is bricked until someone goes sherlock on a good one so they can be replicated.


All of the card decode is done in the PALs. It sounds like your address line decode has gone haywire.

Good luck.

He might be able to exchange the pal from his bad card to temporarily see if they work on the good card. That will let him know if they are bad. I would, as I expect to find on mine that it is a bad solder connection or trace. At least mine now goes to the title screen.



#54 marc.hull OFFLINE  

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Posted Mon Jan 15, 2018 5:33 PM

Well I hope you are right. I really don't know if all Corcomp FDC PAL equations are equal. The 12L6nc has dedicated in/out pins ( if I am remembering right) so no possibility of damage ( check the data sheet first) in swapping.

I just know that both those IC's are connected straight to the PEB without buffering and that is the source of my doubt.

As a general question.

Does anyone here have the capacity ( or is it possible) to read out the PAL state with or without security ?

This has been an on going issue for quite a while and a replacememt would be very benificial.

#55 arcadeshopper OFFLINE  

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Posted Tue Jan 16, 2018 3:10 PM

 I would be interested on getting a "set"  of these chips from you.  Could you please contact me , thru email, at >jstimatz2015@yahoo.com< to discuss this more ...

 

Thanks...

 

Jt

 

you already did.. i resell his chips, he mailed them to you

 

Greg



#56 pcoderdude14 OFFLINE  

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Posted Thu Jan 18, 2018 3:52 AM

Hey All! :-)

 

 

you already did.. i resell his chips, he mailed them to you

 

Greg

Ok.   I thought so, when I saw his email addy...

Thanks Greg !

 

Jt



#57 Ed in SoDak OFFLINE  

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Posted Sat Mar 31, 2018 6:11 PM

Interesting read! Stuart directed me here from my thread about my dead-in-the-water TI php1850 sidecar disk controller. Any updates on fixing the CorComp cards?

 

I'm guessing the TI won't have any PAL chips. |:) <pray>

-Ed

Attached Files

  • Attached File  Arte.jpg   30.02KB   1 downloads

Edited by Ed in SoDak, Sat Mar 31, 2018 6:13 PM.


#58 Ksarul OFFLINE  

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Posted Sat Mar 31, 2018 11:47 PM

There are PALs in the 1850, but TI's internal documentation usually included the equations for their PALs, so it would be possible to recreate them. You'd have to look into the 1980 version of the disk controller hardware specs to get the right PAL equations, as the 1982/1983 versions of the same document only included the equations for the PEB card. I just spent a while hunting on WHT, and most of the hardware specs don't seem to be up there anymore. I'll have to go digging in my scans to see if I still have them. . .



#59 Schmitzi OFFLINE  

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Posted Sun Apr 1, 2018 1:51 AM

Is that two switches on the back of the 1985 Revision above the edge card connector for the external drive(s)?  I never saw that card before.

 

 


....


Although, the one with the two push-button switches has got me intrigued, never seen a CC-FDC with that arrangement.  Any more info on that guy??

 

...

 

Will be back...

 

-Dano

 

Hi,

 

where do you see this card with the 2 push buttons on the back side here ?

Can you please point me there ?

 

My only hint is that it has to do with Miller Graphics (maybe), and that the 2 push buttons are for:

 

UPPER BUTTON:

<Pressed> -> CRU=1000       /   <Released> -> CRU=1400

 

LOWER BUTTON:

<Pressed> -> "Lower Block"   /   <Released> -> "Upper Block"

 

(I don´t know what that with the "Blocks" means"... memory ?)

 

I saw that on a pic from a german card, some time ago.

 

xXx



#60 fabrice montupet OFFLINE  

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Posted Sun Apr 1, 2018 3:54 AM

I had problems with this Corcomp FDC too.  One of them stopped working after  the power supply of a PEB died. Result: The two PAL chips passed. I have replaced them and all is OK now.
The problem of this card is its poor design. It doesn't have buffers to protect the PALs. It's a shame because it is easier to change 74LS244/245 than changing PAL chips hard to find or neccessiting material to program new ones.
 


Edited by fabrice montupet, Sun Apr 1, 2018 3:55 AM.


#61 Ksarul OFFLINE  

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Posted Sun Apr 1, 2018 4:27 PM

Fabrice, do you have the JEDEC files for the CorComp Disk Controller PALs? We've been trying to find unlocked copies of those for quite some time. . .for that matter, usable JEDEC files for any card's PAL sets would be useful things to place in one of the community repositories.



#62 fabrice montupet OFFLINE  

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Posted Sun Apr 1, 2018 5:48 PM

Alas, I can't help you  :(

The card died six or seven years ago. As I had no 12L6 programmer and no Jedec files of the CC FDC, I have ordered the two PAL chips to a TI-99 user.
 


Edited by fabrice montupet, Sun Apr 1, 2018 5:53 PM.


#63 Ksarul OFFLINE  

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Posted Sun Apr 1, 2018 9:12 PM

No problem at all--one can always hope that an unlocked set of them turns up someday.  :)

 

It is sort of strange that I've been hunting PAL data today and turned up something else that I've been looking for in that area. It seems that Paolo Bagnaresi did a complete disassembly of an unlocked set of PALs for the Myarc FDC back in the nineties. I had a document to that effect (the Hardware Compendium, pulled down from WHT), but had completely missed that particular chapter as it wasn't a subject I was busy researching at the time I downloaded my copy. I spent much of a year trying to track down a version of that PAL (and was able to obtain a copy of the latest version from SNUG), and it turns out I had something I probably could have used to regenerate it all along. . .



#64 fabrice montupet OFFLINE  

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Posted Mon Apr 2, 2018 4:51 AM

By my side, all is not lost.  The PAL chips that I have received are copies of the originals, so I suspect that they are not protected. I just have to buy a IC programmer that accepts  12L6 PALs (the one I own only recognizes EPROMs, EEPROMs, PICs, PLDs and GALs but no 12L6). Thereupon, if you have a PAL programmer model to recommend me, tell me :-)



#65 Ksarul OFFLINE  

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Posted Mon Apr 2, 2018 5:27 AM

I have an Advin Pilot that will program and read pretty much any of the older PAL chips out there. Disadvantage to that one is that it requires direct access to a parallel port, so it doesn't work on the newer Windows operating systems. I use mine with an off-network Windows 2000 box. Unfortunately, none of the newer programmers I've tested will program the older chips (MiniPro, Topwin, Xeltek).



#66 fabrice montupet OFFLINE  

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Posted Mon Apr 2, 2018 8:08 AM

none of the newer programmers I've tested will program the older chips (MiniPro, Topwin, Xeltek).

This is my problem, and why I asked which programmer can do the job, maybe I will be able to buy one, and  whatever the computer needed: I have all old generation of PC computers (8088/86,286,386,486, Pentium I/II/III/... and all others )



#67 atrax27407 OFFLINE  

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Posted Mon Apr 2, 2018 6:00 PM

Here is a cross reference for PAL/GALs. The MiniPro will do GAL16V8s

Attached Files



#68 fabrice montupet OFFLINE  

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Posted Tue Apr 3, 2018 4:10 PM

I have a programmer that also accepts many GAL chips including the Lattice GAL16V8 . But, if it can write this GAL in PAL mode (I have already done), it can't read a PAL chip directly :-(

I had the confirmation that the TL866 will not work for reading the PALs.

 



#69 marc.hull OFFLINE  

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Posted Tue Apr 3, 2018 7:00 PM

By my side, all is not lost.  The PAL chips that I have received are copies of the originals, so I suspect that they are not protected. I just have to buy a IC programmer that accepts  12L6 PALs (the one I own only recognizes EPROMs, EEPROMs, PICs, PLDs and GALs but no 12L6). Thereupon, if you have a PAL programmer model to recommend me, tell me :-)


Who supplied you with the PALs?

#70 fabrice montupet OFFLINE  

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Posted Wed Apr 4, 2018 5:03 AM

Michael Becker :-)



#71 atrax27407 OFFLINE  

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Posted Wed Apr 4, 2018 6:58 AM

Jim,

 

It looks like you will have to "ping" Michael again.



#72 fabrice montupet OFFLINE  

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Posted Wed Apr 4, 2018 9:39 AM

A few years ago, Michael has done a big clean-up of his basement. Not sure he still has these PAL chips. By my side, I do all my best to find a compatible programmer to read the PALs.



#73 marc.hull OFFLINE  

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Posted Wed Apr 4, 2018 4:34 PM

I don't think anyone really is worried about the ICs. It's the equations that are after.

#74 atrax27407 OFFLINE  

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Posted Wed Apr 4, 2018 6:05 PM

If you can read the ICs, you have the equations.



#75 marc.hull OFFLINE  

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Posted Wed Apr 4, 2018 6:59 PM

Not sure you actually can do that. Limited information I could find. If you know more then please expand.

My point is that "if" MB programmed these replacements then obviously he has the info and probably much more.

There's your resource.




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