1450 XLD motherboard build, assorted questions

[mimo]

That looks perfect, how do we do that without an xf551 to destroy?

Oh,,, you mean the 1200XLD?

 

You can't get a 1050 mech in there, but the 3.5 was 'Made For It"

 

Bob

 

Well, we could make a new run of 1450XL bottoms and the 1400/1450XL cartridge/port side panel, then the 1200XL tops could be used.

 

 

That would probably be easiest. Although, from a practical usefulness point of view, I'd rather have a custom bottom to house a 130xe and jack in the 1200xl top and keyboard. As long as I'm dreaming, let's cut the right side open to slide a 1050 mech into it. The thought of a 1400xl looking case with built in floppy on the side, 128k etc is very enticing.

[JohnBuell]

Oh,,, you mean the 1200XLD?

 

You can't get a 1050 mech in there, but the 3.5 was 'Made For It"

 

Bob

 

 

Is that one of your famous mods, Bob?

[+Faicuai]

Oh,,, you mean the 1200XLD?

 

You can't get a 1050 mech in there, but the 3.5 was 'Made For It"

 

Bob

 

 

 

...The workmanship, attention to detail and functionality of the change seems definitely nice.

 

But why not an S-DRIVE/CF-DRIVE instead? (infinitely less cutting/work, minimalisti slots, maybe one or two tiny leds (which could remain conceiled inside just for verification purposes through the vents), etc.

 

F.

[+Stephen]

Oh,,, you mean the 1200XLD?

 

You can't get a 1050 mech in there, but the 3.5 was 'Made For It"

 

Bob

 

 

 

...The workmanship, attention to detail and functionality of the change seems definitely nice.

 

But why not an S-DRIVE/CF-DRIVE instead? (infinitely less cutting/work, minimalisti slots, maybe one or two tiny leds (which could remain conceiled inside just for verification purposes through the vents), etc.

 

F.

I'm sure when this machine was done, SD cards did not exist

[+kheller2]

Doesn't Bob also have a 1200XL with a built in HD?

[+bob1200xl]

A CF card - OK!

 

There is a huge difference between a CF card and a floppy drive. I built a controller with a 2797 that ran directly from the CPU for the 3.5, but it could not keep up with the data transfer from the disk. It would read (really fast) and then 'miss' a sector because of DMA from ANTIC. This forced it to wait until the data came back under the head before it could continue. Not acceptable.

 

The CF card is not rotating media and has a buffer, so we don't get that kind of problem. Works great...

 

Bob

 

 

Oh,,, you mean the 1200XLD?

 

You can't get a 1050 mech in there, but the 3.5 was 'Made For It"

 

Bob

 

 

 

...The workmanship, attention to detail and functionality of the change seems definitely nice.

 

But why not an S-DRIVE/CF-DRIVE instead? (infinitely less cutting/work, minimalisti slots, maybe one or two tiny leds (which could remain conceiled inside just for verification purposes through the vents), etc.

 

F.

[+bob1200xl]

Yes, somewhere...

 

CF is same, just with an IDE/CF adaptor.

 

 

Doesn't Bob also have a 1200XL with a built in HD?

[atarifan49]

First question: DIN Power Connector. The schematics call for a 7-pin DIN connector for power, the Atari BOM calls for an 8-pin. The motherboard can accommodate either since it has enough holes, but doesn't seem to require the 8th pin. What was used on the factory motherboards? The pictures I've seen are too blurry to make it out. I am specifically wondering about the variant built on the "1450" motherboard (NOT the Tong), since they may have done different things on different boards. Anybody got one that they can check? My first thought was to ask Curt, but I emailed him a week or two ago and haven't heard back.

 

Here are the specs from both a 1400XL and a 1450XLD brick power supply.

 

1400XL Power Supply

Part # CO62023

Power Supply DV-51220W

 

Input:

120V AC-60Hz 0.45A

 

Output:

Pin 1, 6 - +5V 1.8A

Pin 4 - +12V 0.5A

Pin 2 - -5V 0.05A

Pin 3, 5, 7 - Ground

 

 

1450XLD Power Supply

Part # CO62297

Power Supply DV-1450

 

Input:

120V AC-60Hz 1.1A

 

Output:

Pin 1, 6 - +5V 2.8A

Pin 4 - +12V 2.0A

Pin 2 - -5V 0.5A

Pin 3, 5, 7 - Ground

 

 

I need to search on my other computer to see if I still have a drawing or picture of the pinout that is on the power supply plate. If you notice above the 1400 current specs for +5 and +12 volts are lower because the 1400XL didn't have floppy drives and disk drive circuit board to power. The 1450XL board that Best Electronic sold was almost a exact layout compared to the 1400XL motherboard. Main differences were with the added connector for the disk drive daughter board and disk drive power connector.

 

Regards,

Glenn

[+kheller2]

Ahhh. That's right, the power supply I had for the 1400 was a hacked 520st one.

Edited August 26, 2011 by kheller2

[Vandal968]

Ahhh. That's right, the power supply I had for the 1400 was a hacked 520st one.

Was the 520st supply a good match?

 

Glenn,

thanks for posting that power supply info.

 

cheers,

v

[+wood_jl]

Oh,,, you mean the 1200XLD?

Very impressive, Bob!

[Vandal968]

Curt,

can you also send me scans of the films for the modem daughtercard? My original thought was to do it in Eagle, but since I don't know eagle it would be a bit of a PITA. My new thought is to etch the boards using the laser in the lab working from the original films. This will mean that the traces are all original-width, and the more artsy features (like fonts) will be exact. Haven't thought of how to do the silkscreen yet, but I will. Should be more fun than just sending it to a board house.

 

Bob,

when do you think you can get those files dumped? My Freddie, (2) PAL's, Blank PROM and some other goodies from Best should be here today.

 

cheers,

v

Edited August 26, 2011 by Vandal968

[+bob1200xl]

My new, whiz-bang programmer would not read a real 16R4, so I had to drag out my old Dell with the 9860 on it (has to run on ISA...). Kinda nice, actually, came up in DOS 6.22 in about 10 seconds. Had to bring it up here on a floppy... find a USB floppy drive for this hog.

 

Here is the file:

 

U1116R4.ZIP

 

It is not a .zip - the Internet Police would not let me U/L a .JED. It's a JEDEC file.

 

Bob

 

 

Curt,

can you also send me scans of the films for the modem daughtercard? My original thought was to do it in Eagle, but since I don't know eagle it would be a bit of a PITA. My new thought is to etch the boards using the laser in the lab working from the original films. This will mean that the traces are all original-width, and the more artsy features (like fonts) will be exact. Haven't thought of how to do the silkscreen yet, but I will. Should be more fun than just sending it to a board house.

 

Bob,

when do you think you can get those files dumped? My Freddie, (2) PAL's, Blank PROM and some other goodies from Best should be here today.

 

cheers,

v

[Vandal968]

My new, whiz-bang programmer would not read a real 16R4, so I had to drag out my old Dell with the 9860 on it (has to run on ISA...). Kinda nice, actually, came up in DOS 6.22 in about 10 seconds. Had to bring it up here on a floppy... find a USB floppy drive for this hog.

 

Here is the file:

AWESOME! Thank you.

Now I just need the BIOS dump from U6 and we can make the magic happen. Thanks Bob.

 

v

[+bob1200xl]

You didn't ask for that...?

 

It's an INTEL 2732a. Lucky for me, my whiz-bang read it OK.

 

U62732A.ZIP

 

As usual, it is not a ZIP file. It's a .ROM.

 

Bob

 

 

 

My new, whiz-bang programmer would not read a real 16R4, so I had to drag out my old Dell with the 9860 on it (has to run on ISA...). Kinda nice, actually, came up in DOS 6.22 in about 10 seconds. Had to bring it up here on a floppy... find a USB floppy drive for this hog.

 

Here is the file:

AWESOME! Thank you.

Now I just need the BIOS dump from U6 and we can make the magic happen. Thanks Bob.

 

v

[Vandal968]

You didn't ask for that...?

 

It's an INTEL 2732a. Lucky for me, my whiz-bang read it OK.

 

U62732A.ZIP

 

As usual, it is not a ZIP file. It's a .ROM.

 

Bob

:) :)

 

Thanks Bob!

[+Stephen]

Watching your progress is almost as much fun as if I had a board and the parts I have plenty of projects to finish up though, so I'll just be watching this from a distance.

[Vandal968]

PAL A, B & Freddie arrived today and are installed

 

It looks like there is one more chip to find that I somehow overlooked (probably because it lives under the modem daughtercard).

 

U36 6551A SERIAL COMM ASYNC C061690

 

Hmmmmmmm......

 

v

Edited August 27, 2011 by Vandal968

[+Stephen]

PAL A, B & Freddie arrived today and are installed

 

It looks like there is one more chip to find that I somehow overlooked (probably because it lives under the modem daughtercard).

 

U36 6551A SERIAL COMM ASYNC C061690

 

Hmmmmmmm......

 

v

Standard UART hopefully?

[Vandal968]

Standard UART hopefully?

 

Sounds like it, but its weird because that P/N comes up as a PWM controller at DigiKey.

 

v

[Vandal968]

Ok, it's actually a S6551A:

http://www.datasheetarchive.com/S6551A-datasheet.html

 

Anyone got an idea for a source?

 

v

[Bryan]

WDC makes a replacement:

 

http://www.westerndesigncenter.com/wdc/w65c51n-chip.cfm

[+David_P]

PAL A, B & Freddie arrived today and are installed

 

It looks like there is one more chip to find that I somehow overlooked (probably because it lives under the modem daughtercard).

 

U36 6551A SERIAL COMM ASYNC C061690

 

Hmmmmmmm......

 

v

 

Well, Brad Koda has them at $4.00 each:

 

http://www.best-electronics-ca.com/custom-i.htm

 

6551 CO61690 $4.00

Edited August 27, 2011 by David_P

[Vandal968]

Well, Brad Koda has them at $4.00 each:

 

http://www.best-electronics-ca.com/custom-i.htm

 

6551 CO61690 $4.00

That was on my order of 08/19/2011 and he told me that they didn't have them. I guess I'll try calling them again on Monday and double-check.

 

thank you,

c

[+David_P]

...then again, his website isn't always up-to-date, so it's possible he's sold out.