rockdoc2010
-
Content Count
267 -
Joined
-
Last visited
Posts posted by rockdoc2010
-
-
Slow down, take a deep breath and look at the first photo in my first reply to you. That shows all three female headers that everything on the upside-down U1MB plugs into. I built mine myself and use it every day so I’m not blowing smoke here.
I get this.. no worries BUT the 2x5 in the XEL dont match up to the 5x4x2 headers on the U1MB.
they do with the 5 and the 4 where did the 2 pin header go?
Douglas
-
The U1MB has three male headers. Once you replace the two large ones on either end, they all point up off the board. The 1088XEL has three matching female headers for those same pins.
The three IC sockets on the on 1088XEL underneath the U1MB mounting space are for PIA and two of the PIC chips as I recall (it’s been 8 months since I finished building mine - look at the pics in my earlier post; I *did* build one and I use it nearly every day so I kinda know what I’m talking about at least a little bit
)yes i have just removed the smaller one and lost three pads in the process. I know what i am doing as well at 14years old i aced a class in electronics assembly.. but the square peg that went into that round hole is SO tight that it is bound to happen.
lets hope i can save the U1MB
Douglas
-
Yep 390 ohm is what they both should be... I'll change it.
As for paying me... not something I'm worried about to tell you the truth. Maybe I'll get you to convert a couple of U1MB's over to straight headers for me
BTW, I was at the post office today, and I saw that they have what they call a Medium Flat Rate Box that costs about $13 no matter what the weight. It's pretty close to the same size as the box you used, just a bit wider and not quite as tall. that'll be the one I'm going to use to send your board back to you (delivers in 3 days or less). When you use your own box, they'll charge you more every time, best to stick with their own boxes when doing Priority mailing. Something to file away in the brain for future reference.
- Michael
well i have found that 390 ohm resisters dont exist. couldnt find them anywhere!
Douglas
sorry i think it was the 51 ohm resister for the 1200XL build
-
The 1088 has three female headers:
- 2x15 at the rear of the board
- 2x5 in the middle, and
- 2x10 at the front
U1MB fits perfectly
Look at the other picture you quoted in your post before - the one, where you commented me soldering the SRAM directly into the board (I was missing the right socket and simply could not wait completing the board)
good job on the sram but there is a 2 pin header that is missing from the scene.
-
This is a mute point! there are no UAV's available so I am currently building a brick
-
No there is not 2x5 in the middle of the 1mb
there are three headers in the middle of the U1MB
a five a four and a two.. side by side
where did the two pin header go?
Douglas
-
Hello guys
Maybe Albert can close this thread?
Sincerely
Mathy
close the thread? i need a board! or i have a 1088xel brick!
-
Nope. Remember, the U1MB goes in upside down (battery on top). All the headers then plug into the female headers on the 1088XEL mainboard.
there is a row of three headers for the little guys and the 1088 has only two sockets
??
-
Hi,
I nearly finished my 1088XEL.
Board soldering is complete, only waiting for Bryans UAV and the CVBS/S-Video header to arrive (takes a while from the US to Europe...)
Is there any recommended test procedure?
I like to avoid burning things...
what I did up to now is:
1) leave all chips out, power up with 5V -> yellow LED is on
checking correct voltage supply at J1, J3 and LM555 -> OK2) inserting LM555, connecting power switch and power LED from Realan housing, switching on -> no smell, no smoke
LED on housing is on, green LED on board is on -> OK3) checking correct voltage supply on all IC sockets and headers -> all correct
Anything else to test?
Or just plugging in all chips, UAV and U1MB and crossing fingers?
Cheers
Michael
you soldered that sram directly to the board? I am not worthy!
-
1
-
-
-
Grow up!
no dont grow up! some brown and beige paint and its an Atari!
Douglas
-
Yep 390 ohm is what they both should be... I'll change it.
As for paying me... not something I'm worried about to tell you the truth. Maybe I'll get you to convert a couple of U1MB's over to straight headers for me
BTW, I was at the post office today, and I saw that they have what they call a Medium Flat Rate Box that costs about $13 no matter what the weight. It's pretty close to the same size as the box you used, just a bit wider and not quite as tall. that'll be the one I'm going to use to send your board back to you (delivers in 3 days or less). When you use your own box, they'll charge you more every time, best to stick with their own boxes when doing Priority mailing. Something to file away in the brain for future reference.
- Michael
well i have found that 390 ohm resisters dont exist. couldnt find them anywhere!
Douglas
-
I'll offer a service for swapping out right angle headers for the PROPER connectors if nothing comes from asking Lotharek to make the boards the way Candle intended them.
dont try to desolder yourself.. i lost three pads and that was on the smaller header.
Douglas
-
We have liftoff of another 1088XEL. Forgive the crappy B&W photos - I am putting a PAL signal into my NTSC 1084S via composite.
i am currently building one and understand the timing issues from USA vs Europe. I was at sea on a westpac and bought a vhs player and the clock lost ten minutes per hour.
OTAY! I get that.. but can i have a PAL system in the USA?
Without setting up a variable frequency drive?
Douglas
-
I believe there is room to make it fairly thick, since the motherboard mounting allows space between it and the back of the enclosure. I'll check this out better when i actually get around to creating the CAD file.
------------------------
Project Update
------------------------
The Version 1.1 PCB file which contains fixes for the problems such as the transposed 6520 PIA address lines and the Power-Up Reset, has now been completed. I'll be making a small run to verify everything, but will be holding off on doing so until my beta testers have had time to run their own tests. I'll also hold off on posting the updated schematics until things look pretty solid and locked in, no sense in having multiple sub version documents of this production version out there in the wild.
One of the highlights of this new version will be a slightly expanded MPBI connector, which allows for adding a couple more signals that will prove very useful for later upgrades such as the Covox sound generation device that was talked about earlier. Here is a sneak peek at the new improved version (added Left and Right Audio Inputs and the /RST signal).
Also fixed the MMU and OSROM mis-routed signals, which wasn't an issue for the U1MB, but might have impacted a replacement daughter board. Speaking of which there has been talk on the Polish forums about possibly having a simple daughter board that would contain the standard MMU and OSROM (or some facsimile thereof). I also had this same thought, and will be looking into doing something like this down the road, once I figure out if I want to approach it in a simple way (just plug in Atari ROM and MMU) or maybe allow for multiple OS switching. However the idea is to keep it simple and inexpensive, thereby being a poor man's substitute for the U1MB board and not try to make it actually do what the U1MB does (what would be the point, the U1MB is a bargain for all that it does).
- Michael
First of all I wanted to express my insane amount of gratitude for what you have done. I have a green one and a blue one. I suppose the red ones were for the beta testers?
Can we get a serial number on these?
Anyway and I am sure it is mute as I am only half way thru the build info in the thread but.....
I need my MTV! I need my Atari keyboard!
Two days ago in 1984 Madonna sang virginistic and I became the third person with a personal computer to spend six months at sea on a westpac with a personal computer.
So I Iterate.
What can we do to use an atari keyboard in this build?
I am looking at the 1200XL and as i have seen so far it is the OS that likes your unit..
I dont need you to give me a version1.2 of your motherboard just an idea as to where do I wander.
BTW I was thinking of adding the circuits and 10 keybad CX-86 to the mix.
Worthy is not what I am!
Douglas
-
I spoke with Lotharek a few weeks ago about the possibility of getting U1MB boards already stuffed with all vertical instead of right-angle headers and he seemed open to the idea, but more negotiation will be required to firm this up.
I can't fully describe what a great feeling it is to simply plug this into the XEL without fussing with ribbon cables and mounting screws. And due to the R&D nature of the first run boards, I have had to remove and replace this numerous times, with each time bringing a smile to my face
- Michael
Its killin' me! I am slowly removing pin for pin the angled header connections in the hopes that i don't destroy the board or chips.
I need the correct header arrangement to even go forward.
Arrghhh
-
The U1MB was designed to have vertical headers anyway and I wish boxed IDC housings would be permanently reinstated. I'm not sure why open right-angle headers were one day deemed a great idea.
So Just having checked the fit of the UM1B that i have i will need to desolder the right angle headers and install straight headers to install it. And i assume P2, P2 and P4 will have to be moved to the other side of the UM1B board as they will be problematic otherwise.
Douglas
-
Wow! be careful what you ask I rekon. The response on this subject was intense. I actually have two 600xl, three 1200xl an xegs, 65xe and 130xe, three 1050 disk drives, an 822, and two alphacom 422, and three 1020 printers.
I was just gazing at the sales and noticed the crazy prices.
I only really need a couple of items.. psu's, joysticks etc.
I am busy getting into mods and builds like a 1200xl from bare MB up and a 1088xel.
I will probably be one of those sellers within five years time.. fun i should probably sell now!
Douglas
-
Hey mytek, thanks for the amazing work you do. I think you might have misconstrued my comment. I was referring to the the original 1088XEL shape and design and the discussion pages of ITX (or ATX) case options. I am saying that the new design fitting the 1050 case is great because as much as I LOVE the original, I couldn't bite yet until a redesign of it fit something more familiar. I'm loving the 1050 redesign, but I feel if THIS is a thing, surely the next revision will be shaping the mobo to fit an:
1st choice: 800XL
2nd choice: 600XL
3rd Choice - ANY drop in replacement of A8.
In summary, my latching on to the 1088 ANYTHING projects is in hope of what the latest C64 scene has brought, namely Gidion's Ultimate 64 (FPGA Commodore 64 board to fit a real c64 case/keyboard) or JENS' Individual Computers MK2 board. So the Atari FPGA based Eclaire board is another near perfect "but I want to use my Atari 600xl/800xl case" scenario for me. Regardless of my comments, I am so much in respect of each and all mentioned creators and projects. UNTIL I have a drop in replacement board for SOME A8, I should point out a a rare combo that could work: PLEASE consider the work here: http://blog.tynemouthsoftware.co.uk
I have corresponded with the kind hearted owner of this. IF you convert an XL, IN THEORY, you have a USB XL that could plug into a MIST, yet ALSO any 1088XEL variation! The closest comparison in Atari world is the XEGS, but I feel it is closer to creating an Atari after-market equivalent of the Commodore 128D vs the 128... gut an Atari, but include a KEYBOARD to connect to a tower.
commodore what?! HISSSSS ( sunnyvale high school not Cupertino!)
-
PCB Layout Updated today. I got a lot more components in place and have decided to take a slightly different approach on the daughter-board business. At this point I think I've dropped about 85-90% of the required parts onto the board. Just need to add some SIP resistor arrays, some SIP headers, and finish adding the components for the power supply section. The nice thing is with the extra real estate that this board offers, no layering of components is required, thereby making life a bit easier when it comes to troubleshooting and/or re-flashing the PIC chips.
The cartridge port will require a small adapter board to transition from a vertical to right angle orientation, as well as for setting the correct height in relation to the front panel. There will also be a small status LED board required.
I'm going with a clock/oscillator IC this time around since these are available for both the NTSC and PAL systems in a x4 frequency (the extra 74HCT74 above it will be wired as a divide-by-four circuit). There will be a socket for this IC to facilitate easy removal and swapping.
14.31818 MHz CO70024 (NTSC) -or- 14.187576 MHz CO70034 (PAL)The built-in IDE is based on the XEL-CF3 with but one exception, it has a 74F08 being used to buffer the 3 address lines. (these are un-buffered on the present day XEL-CF3 destined for the 1088XEL). I believe buffering those bits will yield even better results.
What look to be a 7805 and a 7812 linear voltage regulators, will actually be a drop-in switching equivalents with a 1.5 Amp rating.
TPSM842xx TO-220 Drop-in Switching Modules
You can pick these up at Mouser for $4.63 each.
wow! new components that do so much. my new 1200xl mb build taught me that I need glasses. i suffer from cant see shit syndrome
-
True, but I've never been a big fan of the 810's looks. Plus it would take up more desk space then I like. But I could see it being another way to go, especially if you want an integrated floppy drive.
Absolutely! It NEEDS to be in a 1050 case!
-
Disclaimer
This is a totally weird self serving project that quite frankly just shows what happens when the frantic gears spin out of control in my bored little brain. Nothing you see here was born out of necessity, nor does it fill a niche that needed filling. And most likely there will be those that will scratch their head and wonder WTF is this good for! And for those devoted Atari hardware preservationist, I'll warn you now that 1050's will die before this project is done (and many more, if this spreads). So if you can't stomach the thought of that, it's best that you stop reading this immediately, curl up into a little ball, and pretend the world is sane.
Are you still here?
Good, let's proceed.
As some of you may already know, this all began a few days ago when I proposed putting a 1088XEL motherboard into a 1050 floppy drive case.
Well that was going to get very messy real fast, with lots of wires and dangling bits holding it all together. So like any reasonable and somewhat lazy person would probably conclude "I decided no way was I going to do that!" But the idea wouldn't die. And to add fuel to this, a posting in a PM suggested designing a new motherboard for a few dead 1050s they had laying around gathering dust. Stupid me latched onto 'new motherboard', and at first I thought that was totally crazy, after all I just finished a big project like that earlier this year, and I just wasn't feeling it. Little did I realize that they weren't on the same wavelength as me, and were really talking about a custom XF drive board that would fit into a 1050 case. Not a bad idea in itself, but that's a whole different story, for an entirely different thread.
Anyway the gears kept turning, and I thought that would be kinda cool and somewhat awesome to have a A8 computer motherboard that would drop into a 1050 case, with no, or very little modification. And even better still if it could piggyback on the 1088XEL project with an internal CF drive that could utilize flashjazzcat's 1088/U1MB Bios to make that CF drive really purr.
I started getting excited, and the ideas just came pouring forth, a dangerous phenomena to say the least
. So suffice it to say a new alternative motherboard project was born.Please welcome the 1088XLD
1088 - Total amount of RAM memory due to built-in U1MB.
XL - Because we are packaging this in a 1050 case, it'll take on the style of this iconic series.
D - Just like the 1450XLD it'll sport an internal drive, although a much faster and more capable solid state one.
Obviously I have a long ways to go. But it's a good start, and since it will re-purpose a lot of the 1088XEL design, it should go much more smoothly through the development process.
PCB Image UPDATED On August 8th 2018, now much closer to final layout
Features
- U1MB
- UAV (routed to standard DIN-5 rear panel video jack)
- Will support PAL or NTSC configurations
- Integrated XEL-CF3 electronics (will leave MPBI+ expansion bus free)
- Rapidus, VBXE, and P-Covox interface control signals to be provided by independent header
- 9 VAC power derived from stock 1050 PSU
- Internal 5 VDC and 12 VDC regulation via cool running switching regulator ICs
- MPBI+ (same as the 1088XEL MPBI expansion bus, but also sporting the missing upper address bits for a full interface, and added 12 VDC)
- PS/2 Mouse and Keyboard front panel jacks
- Front panel Joystick ports and 3.5mm Stereo audio output jack
- Dual Stereo Pokeys with electronic Mono/Stereo switching via the U1MB
- V-Gate chip to kill video overscan
- Dual SIO ports
- Front access cartridge port
The journey begins
piggyback a 1030 modem case as an additional power supply for laptop capability? Lithium Ion batteries are the shit for mods!
get er done!
-
1
-
Disclaimer
This is a totally weird self serving project that quite frankly just shows what happens when the frantic gears spin out of control in my bored little brain. Nothing you see here was born out of necessity, nor does it fill a niche that needed filling. And most likely there will be those that will scratch their head and wonder WTF is this good for! And for those devoted Atari hardware preservationist, I'll warn you now that 1050's will die before this project is done (and many more, if this spreads). So if you can't stomach the thought of that, it's best that you stop reading this immediately, curl up into a little ball, and pretend the world is sane.
Are you still here?
Good, let's proceed.
As some of you may already know, this all began a few days ago when I proposed putting a 1088XEL motherboard into a 1050 floppy drive case.
Well that was going to get very messy real fast, with lots of wires and dangling bits holding it all together. So like any reasonable and somewhat lazy person would probably conclude "I decided no way was I going to do that!" But the idea wouldn't die. And to add fuel to this, a posting in a PM suggested designing a new motherboard for a few dead 1050s they had laying around gathering dust. Stupid me latched onto 'new motherboard', and at first I thought that was totally crazy, after all I just finished a big project like that earlier this year, and I just wasn't feeling it. Little did I realize that they weren't on the same wavelength as me, and were really talking about a custom XF drive board that would fit into a 1050 case. Not a bad idea in itself, but that's a whole different story, for an entirely different thread.
Anyway the gears kept turning, and I thought that would be kinda cool and somewhat awesome to have a A8 computer motherboard that would drop into a 1050 case, with no, or very little modification. And even better still if it could piggyback on the 1088XEL project with an internal CF drive that could utilize flashjazzcat's 1088/U1MB Bios to make that CF drive really purr.
I started getting excited, and the ideas just came pouring forth, a dangerous phenomena to say the least
. So suffice it to say a new alternative motherboard project was born.Please welcome the 1088XLD
1088 - Total amount of RAM memory due to built-in U1MB.
XL - Because we are packaging this in a 1050 case, it'll take on the style of this iconic series.
D - Just like the 1450XLD it'll sport an internal drive, although a much faster and more capable solid state one.
Obviously I have a long ways to go. But it's a good start, and since it will re-purpose a lot of the 1088XEL design, it should go much more smoothly through the development process.
PCB Image UPDATED On August 8th 2018, now much closer to final layout
Features
- U1MB
- UAV (routed to standard DIN-5 rear panel video jack)
- Will support PAL or NTSC configurations
- Integrated XEL-CF3 electronics (will leave MPBI+ expansion bus free)
- Rapidus, VBXE, and P-Covox interface control signals to be provided by independent header
- 9 VAC power derived from stock 1050 PSU
- Internal 5 VDC and 12 VDC regulation via cool running switching regulator ICs
- MPBI+ (same as the 1088XEL MPBI expansion bus, but also sporting the missing upper address bits for a full interface, and added 12 VDC)
- PS/2 Mouse and Keyboard front panel jacks
- Front panel Joystick ports and 3.5mm Stereo audio output jack
- Dual Stereo Pokeys with electronic Mono/Stereo switching via the U1MB
- V-Gate chip to kill video overscan
- Dual SIO ports
- Front access cartridge port
The journey begins
You Gave it a cartridge port OMG!
-
1
-
I think we must be out of the recession! I am noticing some insane prices asked for items on Ebay. I was just wondering about the 250 to 300$ prices asked for for a working 800XL or 130XE. Not to mention if you might find a 1200XL which I think is the most desired yet hardest to work with of the XL line.
I myself have 5 1200XL's in various states of nakedness and I am building one from a bare MB (god knows I want 5 more bare 1200XL MB)
It seems to me that prices have doubled in the last three years for anything atari.
Supply and demand? I bought a brand new 600XL back in the 80's and got my money back to go towards a 1200XL in a different store from which it was purchased,
B&C computers when they had a storefront in the south bay.
My 1200XL love affair started then and I still buy from B&C.
Just wondering if anyone else is taken aback or has a clue as to why the cost has risen so much?
Cheers
-
1
-
Like us on Facebook
Follow us on Twitter
AtariAge on Instagram
Watch us on YouTube
Chat on Discord
1088XLD - Custom A8 Computer in 1050 Drive Case
in Atari 8-Bit Computers
Posted
PUPPY! i remove you from my list of evildoing cat strokers......