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Cbm 2001 Pet strange boot

Dave_C78

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Simples...

A TMS2532 and a TMS2732 have different pinouts. The two are INCOMPATIBLE with each other.

A 2532 EPROM has A11 on pin 18.
A 2732 EPROM has A11 on pin 21.

UD9 has A11 on pin 18. Hence, only a 2532 will work. QED!

A 2732 ‘can’ be made to work, but only under special circumstances...

Dave
Ouch!! So need i re-burn on 2532....
ok thanks!
 

daver2

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I have just edited my last post to add more details. Look at the PET schematics and compare the pinout of UD9 with the datasheet pinouts for the 2532 and 2732.

Write this on a wall plaque “2732 <> 2532” - it is important!

Dave
 

Dave_C78

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Ok so this is CHARLIE with 2532 eprom on ud9 (magicrom by Nivag).
 

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Hugo Holden

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Dave_C78

Have a look at this thread:


The ROMs to use are the 2532 . Except for UD8 edit ROM and the character ROM UF10, both of these need to be the 2716 type.

The readily available GQ-4x programmer can do both types.

As noted a 2732 is only going to work if you make a socket adapter, or the pins are miss-wired and they could never work. This might be why you have had so little luck trying to find the faults on your board so far.

(also noted on another thread, with a 2716 ROM, this can sometimes give trouble in the PET in the character ROM position. If it does you have disconnect its pin 21 and hard wire that to +5V)

It could be worth making an entire set of good ROMs from the files on Zimmers. Fitting them all, trying the computer. The result after that might give some clues what else is wrong, and then move back to the PETTESTERS after that. If all else was working without the PIA's fitted, it would come up with the BASIC prompt and no cursor.
 
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Dave_C78

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Dave_C78

Have a look at this thread:


The ROMs to use are the 2532 . Except for UD8 edit ROM and the character ROM UF10, both of these need to be the 2716 type.

The readily available GQ-4x programmer can do both types.

As noted a 2732 is only going to work if you make a socket adapter, or the pins are miss-wired and they could never work. This might be why you have had so little luck trying to find the faults on your board so far.

(also noted with a 2716 ROM, this can sometimes give trouble in the PET in the character ROM position. If it does you have disconnect its pin 21 and hard wire that to +5V)
Ok thanks so much for suggests!
 

daver2

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Right Nivag, now we have “magic” running, what does it do?

I am assuming we have a video RAM readback issue. This could be verified by a little “magic 2” bit of test code:

1. Clear the screen.
2. Write the 256 characters from $00 to $FF into screen addresses $8000 to $80FF.
3. Read the 256 characters just written (one at a time from $8000 to $80FF) into memory from $8100 to $81FF.

If we have a video RAM read issue, we should observe it, and the resulting patters to identify what is wrong.

Of course, your “magic ROM” could already do a similar thing, so we just need to observe.

Dave
 

Nivag Swerdna

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Re: Configuration CHARLIE

The supplied binary does not do what is displayed in the photos. I think the wrong image must have been used. Please use the image posted in #421
 

Nivag Swerdna

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I used correct bin file...download from post #421
I just downloaded it again from #421 and verified. It does not behave like what you are seeing; it is very different from PETTESTER. Can you checksum your ROM and post that (along with the model of your EPROM burner and a hint to which checksum algorithm it uses)
 

Nivag Swerdna

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I verifyed now and not corresponding to magicrom.bin.... now i try to burn again, please wait some minutes :(
We probably need to name the ROMs to avoid confusion. Maybe by checksum. Please send us the checksum you believe is magic_rom.bin and then we will refer to it by checksum.
 

daver2

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Yes, the 2532/2732 issue is a constant source of confusion. I always have to triple check from first principles myself. Perhaps I need a wall plaque myself!

Dave
 

Hugo Holden

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On my GQ-4x4 eprom programmer, if i wanna burn a tms2532a like a 2732A i must use a special adapter...

Where did you come up with the idea of using the TMS2532A ?

Don't get involved with the TMS2532A. As I mentioned before the device you need is the TMS2532.

The TMS2532 and TMS2532A are NOT IDENTICAL.

(I think the GQ-4x cannot program the TMS2532A, it can read it, but not write to it, different programming voltage requirements as I recall. There are programmers around that can program the TMS2532A, the BP1400 can , as I recall)

So again as we have mentioned you need the TMS2532 !

The GQ-4x will program the 2732 as it will many other ROMs, it is simply set for that IC, adapters are not an issue.

In summary, use the 2532 and the 2716 with your GQ-4x and you wont have any trouble and keep away from the 2732 and the 2532A.

People in the arcade game industry have suffered at the hands of the TMS2532A:

 
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Dave_C78

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Oh yes!
This is CHARLIE config. 's screen! Nivag correct now?
 

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daver2

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It does indicate a problem though - but only if the checksum is correct!

Incidentally, the graphic characters in the upper-left should be uppercase letters - but they will be graphic characters with the PIA and VIA devices removed.

I'll let Nivag divulge the magic secret!

Dave
 

Dave_C78

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Please post the CHECKSUM of your Charlie configuration ROM. We need this to avoid confusion. Take it out, read it in your programmer and post the checksum.
Ok, i read my eprom and this is file bin that i saved:
 

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