Upgrading H89 from MTR-88 to current versions

[Kenneth L. Owen]

Hi All,

 

I am working to upgrade an H89 with the CPU card:  85-2208-1

 

It is under repair and upgrade to run the MMS-84C ROM to implement the Z67-IDE addition.

 

The board came in configured for 2k ROM.  The later ROMs (such as 444-84 MTR-89, 444-142 MTR-90 or MMS-84C) are 4k units and require a configuration change.

 

I have uncovered a couple of problems with doing this:

 

1.                   The configuration jumpers are differently numbered.

2.                   Installing the jumper on JJ504 to pin 14 of the left side bus and installing new chips for U516 (444-83) and U518 (MMS-84C), the computer will not work to produce a boot prompt or startup beeps.

 

Does anyone on the group have any experience with the configuration change for upgrading the boot ROM for this older version CPU card?

 

-- ken

[Mark Garlanger]

There are other chips (decoding?) that need to also be swapped out. I'll try to find documentation for that when I get home tonight.

Mark

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[Kenneth L. Owen]

Hi All,

 

I have a typo in my previous note:  the jumper is installed at JJ506.

 

-- ken

[Terry Gulczynski]

Ken,

The H88/89/90 Configuration Guide describes how the jumpers are set, as well as the configuration required for the different PROM chips.

Specifically, it refers to the 'older' and 'newer' CPU boards and the jumper arrangement for each.  I think you're describing an 'older' unit that has four jumpers in the middle of the board (JJ501 - JJ504) and four on the left (JJ505 - JJ508).  For these boards, JJ506 (center pin) is connected to pin 14 on the left-side expansion connectors.

On new CPU boards, the jumper is connected to JJ505 (center pin) to expansion pin 14.


In neither case is JJ504 used to connect to expansion pin 14 as you describe below.


Finally, yes, 444-83 is required in U516 to map the 4K ROM into the memory map.  This is correct for either the MMS ROM or the MTR90.

To be certain, you should also have 444-66 in U517.


Regards,

Terry

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[Terry Gulczynski]

Ken - sorry, I posted in the other thread before I noted this update.  JJ506 is, indeed, correct.

Pls verify that JJ505, 507, & 508 are all set to '1' or (B).


Terry

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[Kenneth L. Owen]

Hi Terry,

 

Hmmm, that’s exactly how I have it:

 

U516 = 444-83

U517 = 444-66

U518 = MMS-84C

 

JJ506 center pin connected to P508-14

 

 

The reference to JJ504 was a typo that should have been JJ506.  (Corrected in a follow-up post.)

 

When configured for 2k ROM and with 444-62 (U518) and 444-41 (U516), it works.

 

-- ken

 

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[Kenneth L. Owen]

Hi Terry,

 

JJ505 & JJ506 were still set to 0 from previous operation.

 

I’ve got to take Julia to the doctor.  I will put it back in tonight to see if this fixes it.

 

-- ken

 

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From: se...@googlegroups.com [mailto:se...@googlegroups.com] On Behalf Of Terry Gulczynski
Sent: Thursday, May 16, 2013 3:52 PM
To: se...@googlegroups.com
Subject: Re: [sebhc] Upgrading H89 from MTR-88 to current versions

 

Ken - sorry, I posted in the other thread before I noted this update.  JJ506 is, indeed, correct.

[Terry Gulczynski]

I commented on your update in the other thread.  As mentioned there, please verify the jumper settings for JJ505, 507, & 508.

If those are all correct, and since you have all of the right parts installed, I'd be suspicious of the MMS ROM.  Where did you get it?  Are you certain it's been programmed correctly?  Have you tried the system with a standard MTR90?

Does the MMS ROM work correctly in a different H89 that is already running the upgraded ROM?


Terry

[Kenneth L. Owen]

Hi Terry,

 

The MMS-84C was removed from my working board.

 

It does not work with 444-84 or 444-142 used with the 444-83 (which also was removed from my working board).

 

The correction on JJ505 & JJ506 may well solve my issue.

[Terry Gulczynski]

You'll need to change JJ505 to '1'.  JJ506 only has the center pin jumper to pin 14 - there is no shorting block on JJ506.

The end result is that shorting blocks on JJ505, 507 and 508 are all '1' (JJ508 might be labeled 'B'); JJ506 has only the jumper to expansion pin 14.


Terry

[Kenneth L. Owen]

Hi Terry,

 

There is no jumper on JJ506.

 

I goofed because JJ507 is between JJ505 and JJ506.  I typed that JJ505 was wrongly set and the adjacent configuration block mis-typed as JJ506.

[Kenneth L. Owen]

Hi Terry,

 

Changing JJ505 and JJ507 did the trick and all is good now – two beeps on power on and the MMS: prompt.

 

I almost had it right, but ‘close’ does not earn any points with computers like it does with horseshoes, hand grenades and atomic bombs.

 

-- ken

 

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