Fired my 65XE

[sideburn]

So they are both the same. Thats not jiving with the schematic. 

[reifsnyderb]

3 minutes ago, sideburn said:

So they are both the same. Thats not jiving with the schematic. 

I just checked the Atari 130XE schematic and what you have doesn't match what I see there, either.  That isn't necessarily unusual, unfortunately.

 

Can you trace out everything related to your crystal, it's connection to Freddie, those 2 resistors, and those 2 capacitors, and post a picture of your schematic here?

 

While I am not an electronic wizard, maybe somebody else can also take a look at what actually exists.  I also have a suspicion, based on my limited experience, as to what Atari may have done.

[sideburn]

16 minutes ago, reifsnyderb said:

I just checked the Atari 130XE schematic and what you have doesn't match what I see there, either.  That isn't necessarily unusual, unfortunately.

 

Can you trace out everything related to your crystal, it's connection to Freddie, those 2 resistors, and those 2 capacitors, and post a picture of your schematic here?

 

While I am not an electronic wizard, maybe somebody else can also take a look at what actually exists.  I also have a suspicion, based on my limited experience, as to what Atari may have done.

Yeah so the device manual had all of the variations you have to match the schematic to the numbers on the board. But even then it’s not accurate apparently. 

[TZJB]

1 hour ago, _The Doctor__ said:

The caps should be valued at 10 and 18 per the schematic spec, so that's borked by a huge margin

Interestingly I just looked at the Remake project and the capacitors in the oscillator are as mentioned here:-

 

 

 

My 130XE has 22pF and 18pF as far as I can tell:-

 

[_The Doctor__]

It is not unusual for the circuit to be tuned to the crystal batch that was used, which we discussed in another thread, and in one of those discussions I gave links to help an individual learn to adjust his caps for what he had. The journey was a success and the 3 different crystal and their runs were sorted out. Not all tuning forks are made equal so to speak.

We just want a a close enough heart beat to get him up an running we will tune later if need be.

 

My thoughts are to replace each component with what was already there and working, you can use the color codes to do that, regardless of the schematic with or without inaccuracies

So replacing a cap with a cap and not resistors is a good start.

Getting the in spec caps even better.

We aren't sure what specific schematics are even being used at this point as a few are mentioned.

 

If we start throwing remakes demakes, other crystal numbers and frequencies in here the waters will get so muddy no one will be able to see.

Edited Wednesday at 06:47 PM by _The Doctor__

[_The Doctor__]

looks like 18  and 12, need natural light and maybe camera correction, it could be 22 only way to know is to test if you can't discern the colors due to lighting or camera issues

Edited Wednesday at 06:45 PM by _The Doctor__

[sideburn]

The main issue right now is I don’t have a crystal that’s even close to what it needs to be. Y1 and y2. 

[patjomki]

22 minutes ago, sideburn said:

The main issue right now is I don’t have a crystal that’s even close to what it needs to be. Y1 and y2. 

Perhaps @tf_hh can sell you those?

[sideburn]

Sent him a message 

[Chri O.]

 It does look like you can replace the whole crystal resonator circuit with oscillator.

 

[reifsnyderb]

26 minutes ago, Chri O. said:

 It does look like you can replace the whole crystal resonator circuit with oscillator.

 

The 130XE reference manual mentions this as well.  It doesn't really help @sideburn as he needs the parts either way.

[Chri O.]

🙂

PAL 3.546895MHz Crystal Alternative Solutions

[doctorclu]

On 10/1/2024 at 9:38 AM, sideburn said:

 

 

Looks like a Mac portable.   Interesting and quite cool.

[sideburn]

Thanks yeah I based it off that. 

[sideburn]

20 hours ago, Chri O. said:

 It does look like you can replace the whole crystal resonator circuit with oscillator.

 

I’ll have to look into this. 

[Beeblebrox]

Ceftainly of the many PAL XE machines (65XE/130XE and 800XE),  I've seen  - they either come with a crystal or an oscillator.  Just as a passing comment the XE PAL system clock crystal is 14.187578 and is not compatible with the 400/800/800XL(stock 800XL), 600XL or 1200XL. It can however be used in an 800XLF.

 

    

 

 

[sideburn]

On 10/2/2024 at 2:00 PM, patjomki said:

Perhaps @tf_hh can sell you those?

He has them so I ordered a couple. $16.00 shipping to USA to send two $1.00 crystals... Oh well...

Edited Friday at 05:57 PM by sideburn