Jump to content
rockdoc2010

1050 happy drive chips?

Recommended Posts

I pulled a happy out of storage and it did not do the power on sequence.

I pulled the drive mechanism and tried it in a known good drive and the mech worked.

I pulled the two chips from a known good board and installed the happy in it.

No Joy!

Your not gonna believe this.....

I then installed the two chips that i removed from the drive when i installed it back in 1984. I still had the chips!!!!!!!!

Now I have a working 1050 drive but the happy is dead.

 

I am in need of and where do I find the following..

 

UM6502

 

94p64b-2583

HART-ECMT-R2

BIG GI ON PRINT

8638 CMA

 

THANKS

 Douglas

 

 

Share this post


Link to post
Share on other sites
2 hours ago, rockdoc2010 said:

I then installed the two chips that i removed from the drive when i installed it back in 1984. I still had the chips!!!!!!!!

Now I have a working 1050 drive but the happy is dead.

Good troubleshooting! So with your work you have determined that the original 6810 SRAM, WDC controller, and 6532 RIOT are all still good. (Along with the original 2 chips you swapped back in--the 6507 CPU and Atari ROM.)

 

Now, as for the Happy board. The primary IC's are a 6502 CPU, a proprietary 8KB mask ROM, and either three 2KB 6116 SRAM's (earlier boards), or 1 8K 6164 SRAM (later boards). Since your mask ROM date code is 8638 (38th week of 1986) I suspect you have the newer 8KB single SRAM chip board.

 

I'd start by replacing the SRAM chips. I've revived two dead or flaky happy boards by only replacing these.

 

Example eBay listings:

6116 2Kx8 SRAM: https://www.ebay.com/itm/254004576632

6264 8Kx8 SRAM: https://www.ebay.com/itm/223327507834

 

2 hours ago, rockdoc2010 said:

UM6502

This is the 6502. It is a common part, and highly unlikely to have a problem from my experience. However, they are cheap if you want to get one to have on hand, eg: https://www.ebay.com/itm/112533588620

 

2 hours ago, rockdoc2010 said:

94p64b-2583

HART-ECMT-R2

BIG GI ON PRINT

8638 CMA

This is the Happy's proprietary mask ROM. It has internal logic to switch between two 4KB banks when accessing specific memory locations in the ROM. This part is not easily replaced without possibly creating an extra 'adapter' board that adds the extra bank switching logic to an EPROM, or unless you can find someone to cannibalize one from an otherwise dead donor board...

 

PS: Did you know that "HART" stands for "Happy Atari Rotating Thing" ? 😄

  • Like 3
  • Haha 1

Share this post


Link to post
Share on other sites

Atari smoked a lot of pot back in the day.

 

It's akin to the scientists on Antarctica wondering where and when is that freiking pizza gonna get there!

 

 

 

  • Confused 1

Share this post


Link to post
Share on other sites

 

LOL re the HART acronym.....Excellent....Scotts brother had a sense of humour...

 

I loved all the rumours re Mr Happy, that he was brought out by Atari back then when he did the ST cart (Discovery??)

 

All rumours and Mr Happy himself has never commented on it (that I know of, I asked Scott when he was on here but him and his brother didn't discuss business other than what Mr Happy was doing for Scott)

Edited by Mclaneinc
  • Like 1

Share this post


Link to post
Share on other sites
11 hours ago, Mclaneinc said:

All rumours and Mr Happy himself has never commented on it (that I know of, I asked Scott when he was on here but him and his brother didn't discuss business other than what Mr Happy was doing for Scott)

I'd love to hear an interview with Richard Adams... But in the mean time, we have this:

https://atariage.com/forums/topic/257578-happy-810-resources/?do=findComment&comment=3935538

 

Share this post


Link to post
Share on other sites
On 8/30/2019 at 7:40 PM, Nezgar said:

PS: Did you know that "HART" stands for "Happy Atari Rotating Thing" ? 😄

The Indus GT drive has a "WART" board - acronym for Wonderful Atari Rotating Thing

  • Like 3

Share this post


Link to post
Share on other sites
28 minutes ago, xrbrevin said:

The Indus GT drive has a "WART" board - acronym for Wonderful Atari Rotating Thing

Oh yeah! I forgot about that. I wonder if it was coincidence, or a nod to inspiration from the Happy enhancement.

 

Here's the passage from Page 1-3 of the Indus GT Field Service Manual: (Which doesn't appear to be on Archive.org yet, I'm going to correct that.)

Quote

The digital board will be referred to throughout this manual as the ‘WART’ board. The name is derived from the original project title for the development of the disk drive. ‘WART’ is an acronym for ‘Wonderful Atari Rotating Thing’. The WART board contains the Z80-­‐A CPU, it’s controlling ROM/EPROM, a 2K RAM buffer and a Western Digital 2797 floppy disk controller (FDC) among other things. In later sections, we will discuss each of the major components on both of the boards.

Edit: Done: https://archive.org/details/indusgtfsmanual

  • Like 2
  • Thanks 1

Share this post


Link to post
Share on other sites

WART...Lol...Great stuff...Love to hear the history of these items although the Happy board has a special side because of the brothers role in Atari history. I had a friend who brought a Happy (810 one) for his machine here in the UK, needless to say he was using it for nefarious purposes and was on the phone to Mr Happy almost every day for about a month after getting it ask how things work and how to do a disk that was giving him issues.

Share this post


Link to post
Share on other sites
8 minutes ago, rockdoc2010 said:

Anyone have the chips?

I provided you eBay links to all the potential off-the shelf main ICs in post #2 of this thread. There's 1 HD74LSxx chip that should be commonly available as well. An original mask ROM can probably only be sourced from a donor board. Hopefully if you replace the other parts, it will be OK. Can you check if your board is 3 2Kx8, or 1 8Kx8 SRAM?

Share this post


Link to post
Share on other sites

Thank you very much

I am currently clearing the holes of solder for a socket for the one 8k chip which will be replaced.

 

Kinda wondering why the power up sequence don't work if you have a bad ram chip? Wouldda thought a controller chip..

Share this post


Link to post
Share on other sites

Hey do you know if this is the proper orientation for the HART chip? The socket is reversed but the square pin is under pin one as this photo expresses.

 

IMG_0019.jpg

Share this post


Link to post
Share on other sites

As it turns out when i opened up my happy drive J6 was in fact off of its plug my one pin. I am unaware as to what J6 does due to a loss of all my tech data. The plug was towards the front of the drive by one pin.

 

Share this post


Link to post
Share on other sites
23 minutes ago, rockdoc2010 said:

As it turns out when i opened up my happy drive J6 was in fact off of its plug my one pin. I am unaware as to what J6 does due to a loss of all my tech data. The plug was towards the front of the drive by one pin.

J6 feeds the read/write signals to the drive head. With that misconnected, it would not be able to read or write any data - although it may initially appear to seek and spinup/down for the poweron self test, and when closing the lever etc...

Share this post


Link to post
Share on other sites
On 9/22/2019 at 9:25 PM, Nezgar said:

Yes, that looks correct. Here is a picture of my board (with 6x2K ROM chips) for comparison:

 

Happy_6K.jpg

Both boards appear to be the same(HE1050D REV C), there are pads for 3-24 pin chips or 1-28 pin chip on both. This would allow the builder to install sockets for whichever type of RAM was available.

Edited by BillC
  • Like 1

Share this post


Link to post
Share on other sites

WOO HOO!

 

Instructions are WONDERFUL!

 

I was able to install my 1050 Happy upgrade with controller into an older TANDON drive and I am HAPPY once again

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...

  • Recently Browsing   0 members

    No registered users viewing this page.

×
×
  • Create New...