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Thread: Modern Saturn 128 redesign.

  1. #11
    Join Date
    Sep 2014
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    Melbourne, Australia
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    I would be interested in one.

    /Rob

  2. #12
    Join Date
    Sep 2016
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    Melbourne, Australia
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    I expect they are weeks away from being ready.
    The prototype boards have been made but are coming registered airmail, so probably about 3 weeks. I am also moving house in 5 weeks time so further development will probably have to wait until I unpack at the new house.

    Who knows if I manage to pack my huge vintage collection of machines and parts ahead of schedule I may find time to complete a prototype and write the GAL code before I move. If I manage the impossible I should have production boards in hand about 10 days after that.

    Quote Originally Posted by rjustice View Post
    I would be interested in one.

    /Rob

  3. #13
    Join Date
    Sep 2016
    Location
    Melbourne, Australia
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    The prototype boards arrived today, it has highlighted a few minor issues with the original layout.
    The card edge is a little too tight a fit in the slot for my liking so I'll adjust the cut lines for the production boards.
    For the production boards I have angle the led footprint so the leds can be bent upward and towards the front for a better viewing angle.
    The hole spacing for the .1uf caps has been changed to better suit the common monolithic cap size rather than the ceramic disc cap spacing.
    The electrolytic cap holes have been rotated 90 degrees to allow it to be bent over horizontally so it is less likely to be damaged.

    Some of the parts I need are at my sons house 400km away, I had them delivered there thinking they would not arrive before I moved.. the move is now delayed so I'll have to get him to send them to me.
    Of course all of my Apple computers have been pack in preparation for the move, so I'll have to locate them and teach myself how to code the rules for GAL programming.

  4. #14
    Join Date
    Sep 2016
    Location
    Melbourne, Australia
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    Minor setback, while writing the GAL rules I discovered that to be 100% compatible with the original Saturn one mode bit needs to be initialised high rather than low like the others.
    The latches I was using to store the mode bits don't support any initialisation other than low. So I've had to use different latches which has increased the chip count by one.
    New prototypes boards have been ordered, hopefully all problems are now resolved.
    Untitled-1.jpg

  5. #15
    Join Date
    Sep 2016
    Location
    Melbourne, Australia
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    The new prototype arrived and its working.
    There was one glitch, when I updated the schematic in KiCAD one wire overlapped the IC pin and it looked connected to me but KiCAD didn't agree and the trace was missing from the gerber.
    After running a jumper for the missing trace all was well. I've updated the schematic so the production run won't have the issue.

    Now that the first board is working I'll assemble another to make sure they play nice with other cards, if I find any issues with that it will just be some tweaking of the GAL code.
    For those that are wondering, yes it does work in a 2e.
    Saturn.jpg

    I'm still out of pocket some due to other pcbs I've had made so for this one I'll need to take advance payments before I do a production run.

    edit: I assembled a second board and they run happily together in a 2e, I also tested with an original saturn card plugged into a slot.
    Last edited by David_M; July 30th, 2018 at 04:37 AM.

  6. #16
    Join Date
    Jan 2012
    Location
    Connecticut, USA
    Posts
    1,488

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    Please put me down for one board as well!

  7. #17

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    I'll Take Two..
    Never Bin or sell your old computer's you will regret it!!
    Vic 20 x3,C64 x2,128D,C128 flat deck,A1000 x2,A500 x3,A2000,A600,A1200,Apple ][e,2x Apple][ GS rom 01,03,Apple ][c x4 with only 1 PSU,2x Laser 128EX EX2,Atari 600XL,2x 800XL,130XE w/320 mod With a MyIDE plus,Atari 1040stf w/2.5meg..

  8. #18
    Join Date
    Sep 2016
    Location
    Melbourne, Australia
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    595

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    I got a quote on the production boards with a ENIG-RoHS finish and gold plated edge connector.
    The boards measure 60mm x 66mm.

    I can confirm the cost at US$10 plus $3.50 postage.
    Once I have 6 prepaid orders I will have the boards made, I should have them in hand ready to ship 6 days from when I place the order.

    PM me for my paypal details.

    I'll put together a parts list in the next few days, I bought the parts for the prototypes on ebay and it cost me less than $10 per board.
    Last edited by David_M; July 30th, 2018 at 06:48 AM.

  9. #19
    Join Date
    Jun 2013
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    Montevideo, Uruguay
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    Sorry for my ignorance, but what this card do ?

  10. #20
    Join Date
    Sep 2016
    Location
    Melbourne, Australia
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    595

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    Quote Originally Posted by soviet9922 View Post
    Sorry for my ignorance, but what this card do ?
    It is a remake of the Saturn 128k memory card for the Apple 2.
    I use it mostly with locksmith to fast copy disks. With the 128k ram card it can read a whole disk in a single pass, then write out a copy in a single pass. I just timed it and it copies a disk in 20 seconds flat.
    It has the functionality of a 16k language card in a Apple 2+, so you can load integer basic into it or for an Apple 2 with integer basic you can load applesoft basic into it.

    Here is the manual for the original Saturn card, this one duplicates its functionality with a lower power usage and lower chip count. Of course all the chips are easy to come by unlike some of the chips on the original card.
    Saturn 64k/128k manual

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