Cbm 2001 Pet strange boot

[Desperado]

No! Not the original EDIT ROM.

The original PETTESTER ROM (not the hacked PETTESTER ROM).

Dave

Now i have only original Pettester rom....not hacked version...

 

[daver2]

Ok, what are you seeing?

Dave

 

[Desperado]

Ok, what are you seeing?

Dave

I replaced two rom and now seems to be better!

 

[Desperado]

Now i'll have to go out...can i resume this job tonight or tomorrow!
Thanks!!

 

[daver2]

No problem. We all have lives!

Enjoy yourself.

Dave

 

[Desperado]

No problem. We all have lives!

Enjoy yourself.

Dave

What can i do for next test? Have a nice day too!

 

[daver2]

I suspect you still have a faulty kernal ROM in socket UD9 though. It’s checksum doesn’t match. But not to worry.

Can you check (with your trusty logic probe) what you observe on pins 1 and 19 of both E7 and E8 (74LS244 video RAM buffers) please.

All four pins should be pulsing away.

Dave

 

[Desperado]

For now only D$ and F$ rom not corresponding with pettester documentation

 

[daver2]

$D is Ok (506a) for BASIC 2.

Dave

 

[Desperado]

Can you check (with your trusty logic probe) what you observe on pins 1 and 19 of both E7 and E8 (74LS244 video RAM buffers) please.

Dave i have High signal on pins 1-19 UE7 and UE8

 

[daver2]

That can’t be right...

Can you post a photograph of the screen that you have up please.

Note that there may be times of inactivity, followed by a burst of activity on these pins.

Dave

 

[Desperado]

yes i have always High signal....with this screen

 

[daver2]

That is the WRONG version of the PETTESTER ROM.

This is the ‘hacked’ version I did for you to skip the initial video RAM test...

Dave

 

[Desperado]

That is the WRONG version of the PETTESTER ROM.

This is the ‘hacked’ version I did for you to skip the initial video RAM test...

Dave

Are you sure Dave?
Must i use normal Version??

 

[daver2]

Yes, we want to diagnose why the first test screen didn't work and fix that hardware problem next...

We can only do this with the 'normal' PETTESTER ROM.

Dave

 

[Desperado]

Ok thanks! Original pettester v4 must bè always insert on ud9 socket right?

 

[daver2]

Yes.

Dave

 

[daver2]

Hang on, isn't UD8 the EDIT ROM (PETTESTER) and UD9 the Kernel ROM???

EDIT: Yes, I just checked the schematics.

Dave

 

[Desperado]

Hang on, isn't UD8 the EDIT ROM (PETTESTER) and UD9 the Kernel ROM???

EDIT: Yes, I just checked the schematics.

Dave

Hi Dave....im confused now... must i insert 2532 pettester eprom on ud9 or 2716 pettester eprom on Ud8?
For now, i have hacked version of Pettester inserted on ud9 (4k eprom)...
Thanks!

 

[daver2]

Ah, have you got Nivag's image in? If so, this is the formal version of PETTESTER but designed for use at $Fxxx (Kernal ROM socket = UD9 = 4K) rather than my $Exxx (Edit ROM socket = UD8 = 2K).

Let me go back over the thread posts to see which test failed and what PETTESTER it was using...

Dave