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#4155606 Happy or US Doubler?

Posted by BillC on Yesterday, 1:45 PM


You can buy supposedly 'authentic' US Doubler from B&C or BEST, although I was disappointed to receive an EPROM from B&C earlier this year...


Haven't mentioned Turbo 1050 yet in the thread, but that is another interesting beast, of which replica's are available from TF_HH... Adds Double-Density and faster than ultraspeed with no additional RAM - only a comparatively large 32KB ROM.


Summary of install methods for each:

  • Any variant of Happy 1050, authentic or replica, and Mini-Speedy use the same install method: Remove U10 (ROM), Remove U9 (6507 CPU), plug happy board into U9.
  • US Doubler: Remove U10 (ROM), Insert USDoubler ROM into U10, may have to move jumpers to JP2 and JP4 (for EPROM configuration), remove U8 (6810 RAM), Install ICD black epoxy module into U8, or homebrew dual-stacked 6810.
  • Turbo 1050 - Remove U10 (ROM), and insert Turbo 1050 board into U10. There's a jumper on the PCB to configure the board for either ROM jumper config.


As long as the RAM module is epoxy encased with the ICD logo I would consider it original, since the US Doubler has both ROM and EPROM versions.



#4150502 B & C computers?

Posted by BillC on Mon Nov 5, 2018 1:49 AM

Sorry,  My bad.  The site is up as you say, just no prices or inventory info.



Bruce also sells on eBay under the name "myatari"


#4147681 4 * 1050 boards fixup - general questions/strategy

Posted by BillC on Thu Nov 1, 2018 10:54 AM

Something to be aware of is that the only stock 1050 firmware that's supposed to be compatible with the 2797 is Rev.L

#4145775 1088XLD - Custom A8 Computer in 1050 Drive Case

Posted by BillC on Tue Oct 30, 2018 2:11 AM


Yeah I kinda figured that's what you meant  :) .


At first I thought the banding I was seeing in my bread boarded prototype was just attributable to the long leads connecting everything together, so that was the main reason I laid out a test board to be sure. Anyway it turned out to not be the cause, and was simply due to the circuit design and the inability to fully isolate the composite color injection from the luma output. So what I need is better isolation in the buffer amplifiers, and I think I found a possible solution that is relatively cheap to implement. ST electronics has the TSH343 triple video buffer chip that might do the trick. It's very inexpensive, selling for less then $2 in quantities as few as one piece, and it runs off a single 5v power supply. The only issue, is that it only comes as a surface mount device, but at least it's in the larger SOIC package which even I with my poor close-up vision can solder.


I have some samples of that buffer chip coming.

Prior to the introduction of Bryans' UAV mod there was an upgrade that used a video buffer IC, the FMS64XX. The TSH343 is meant for component video



The FMS64XX chips buffer chroma/luma, and also create a buffered composite signal. They are discontinued and no longer available from major suppliers like Digikey or Mouser, but are available from eBay at reasonable prices.




Correction: The FMS6406 is still available from Digikey and probably other suppliers as well, the price is higher than the FMS6400 through eBay.


#4132449 ATARI 800 XE - ON/OFF switch

Posted by BillC on Sat Oct 13, 2018 12:05 AM

Oh yeah, best! So glad I have his catalog now... it has so much more than the site and much better organized... he really should just post a PDF of it, or at least not charge for it..

Looked it up: 1200XL/600XL/800XL/65XE/130XE On/Off Switch CO61913 / CO61022 / CO70006 ..... $1.25

Anyhow, I guess that's 10:30pm to 2:30am Czech Republic time. :)

The prices have changed since the catalog was printed, these are from the addendum.


Atari 1200XL vertical mount On / Off toggle switch CO61022 / CO7006 / C061913  $2.50

Atari 600XL / 800XL vertical mount On / Off toggle switch CO61022 / CO7006 / C061913  $2.50
Atari 65XE / 130XE vertical mount On / Off toggle switch CO61022 / CO7006 / C061913  $2.50


#4132235 ATARI 800 XE - ON/OFF switch

Posted by BillC on Fri Oct 12, 2018 4:44 PM

And from digikey.. compare shipping to CZ i guess



Also see previous thread: http://atariage.com/...r-switch-stuck/

This 300 series switch from E-Switch is almost identical for only $3.24 versus $7.41 for the C&K


#4127308 SDrive-MAX ATX support

Posted by BillC on Thu Oct 4, 2018 3:26 PM

The issue may not be with the case dimensions but that this particular screen was slightly larger than most.

Not every device is manufactured exactly to specifications.

#4126154 1050 Field Service Manual - 51 page version

Posted by BillC on Wed Oct 3, 2018 12:31 AM

That's because that is a modern modified version of the original Atari manual.



The index of the 40 page 1050 Field Service Manual on atarimania shows 15 pages(1-11 to 1-21, 2-1 to 2-3 and 3-1), which are missing.


Some further search found another pdf on Atarimania, "Service Manual for the Atari 1050 Disk Drive", which includes the missing 15 pages.  It consists of poorly aligned page scans, and the schematics which were too large to fit on a single page are on 2 pages with overlap.


It appears to me that the modifications to the version I linked are OCRed text, removed blank areas on pages, and the size of some of the illustrations modified to fit the changes, but that the basic content doesn't appear to have changed.


This version could be useful to many people needing information from the missing 15 pages, which is why I started this thread.

#4125859 1050 Field Service Manual - 51 page version

Posted by BillC on Tue Oct 2, 2018 1:55 PM

Most of the sites that have this manual have a version that's only 40 pages, missing a lot of information.


I found a version which has 51 pages that appears complete, including more legible schematics.



#4124440 PBI Test Board Found

Posted by BillC on Sun Sep 30, 2018 1:48 PM

Yes it will use a standard 9vac Atari computer peripheral ps

I dont see a production date on the pcb. I need to reference the chip# but I think it may just be a prom but Im not certain

Ive got a stack of these in 850 cases that are modified

Let me open a few for comparison

I don't see any rectifier diodes which makes me think it uses a DC power supply. The power jack also appears to be mini phone connector type like used with the CO10472/2600.

#4120284 What's the latest Atari related thing(s) you've bought on ebay?

Posted by BillC on Mon Sep 24, 2018 5:53 PM

Picked Up a couple 810s off of eBay. One is a Happy Drive that was refurbished by a guy in San Jose. Probably an Atariage member I bet. Anyone know where to purchase the special happy software from?

AFAIK the latest software for the Happy 810 is V5.3


#4119705 1050 Bi-Colour LED Resistors

Posted by BillC on Sun Sep 23, 2018 11:50 PM

Here is an updated image of the write protect circuit from the SAMS Computerfacts1050 schematic, showing the connections for the B13JJVCF  as write protect switch/status LED, along with adding the unused gate of U11 to allow increased current for the red LED. 


I chose the down position of the switch for the NORMAL(mechanism sensor) operation as this switch then matches the positions used by the Happy Controller write protection switch. 

SAMS-1050 write protect circuit.jpg

#4119533 1050 Bi-Colour LED Resistors

Posted by BillC on Sun Sep 23, 2018 6:22 PM

The B series switch LEDs have higher forward voltage than the original power LED.

The forward voltage for the red LED is 1.95V, which means the current limiting resistor will need to reduce the voltage by 3.05V at the desired current.

The forward voltage for the green LED is 3.3V, which means the current limiting resistor will need to reduce the voltage by 1.7V at the desired current.


The 74LS02 is rated at a maximum low output current of 16mA, if higher current is desired for the write protection ON LED there is an unused gate on U11 that could be connected in parallel to double the maximum current. The image below is from the SAMS Computerfacts 1050 Manual, with the unused gate highlighted.

SAMS-1050 write protect circuit.jpg

#4119026 1050 Bi-Colour LED Resistors

Posted by BillC on Sun Sep 23, 2018 3:31 AM

I checked the specification sheet for the switches listed in my previous post and they will fit in place of the power LED, and provide write protect switching and red/green status LEDs.


Below is an image showing its approximate footprint on the 1050 PCB, the rear pad locations for the vertical switch version are touching the pads for the power LED. The image has the solder pads for both the vertical and horizontal versions. The vertical version doesn't use the 2 pads on the center line, the horizontal version doesn't use the 2 pads furthest back.



#4117799 Atari 800 problems - made a short video

Posted by BillC on Thu Sep 20, 2018 9:29 PM

That sounds brilliant, have you got a link by any chance?  :)

Here is a post from a week ago with links for the 3 main pieces, the SIO cable and case will need to be obtained elsewhere.



AFAIK there isn't anyone selling complete units, this may change though.