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mechanerd

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Posts posted by mechanerd


  1. It would be great if the buyer or seller could archive the program and manual.

     

    Allan

     

    Here are some photos of the manual before I shipped it. I didn't know if anyone would ever ask..

    https://drive.google.com/drive/folders/10iUX9yW1JEY7IWAIJduJQrCx9ALFHQ3L

     

    The manual for the CX85 10 keypad

     

    https://drive.google.com/drive/folders/18L2H-kIH0syBtWqTuk5Sp529_ZNwYIaK?usp=sharing

     

    Omniview 80 manual with the Ramrod and Omnimon manuals and notes.

    https://drive.google.com/drive/folders/1NqS51266Y4xuX3R5E5S-QKnY6393czyM?usp=sharing


  2. A MIDIMate interface for the Atari 8bit computers. Plugs into the SIO port. Works with MIDI Music System 1.0 and MIDI track III. Includes two 1/4 " to RCA adapers for the Sync In and Out ports.
    Includes original disk and manual for MIDI Music System software.
    It also can convert AMS music to MIDI format that is uses. (.MUS file extension.)
    Includes a CD of the entire archive of the 3000 public domain MIDI files that can be played with this interface from the Action Annex BBS. I was co-sysop for a few years back in the day. This was the very same interface Donna used to make audio tapes and test her composition. How's that for maximum compatibility?

    Since all the MIDI Max interfaces are sold out at Best Electronics, this may very well be one of the last few times you will ever find a vintage equivalent interface like this. Until someone remakes the interface for the 1088xl or finishes the reverse engineering of an equivalent.

    SOLD!

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  3. I don't think you can use this with the Fastchip since the Omniview rom add on is mapped to the same space. C000-CFFF . However, on the ram rod board you can pull the Omniview out and put the Omnimon in. There was also a piggyback board for the Omnimon to add to the ramrod so you could switch between the two option roms.


  4.  

     

    However those other small wall wart power adapters that already come with a coaxial power connector, do seem to work just fine, and live up to their current ratings. That's because they are actual DC switching PSU's intended for powering up a device, and not aimed at charging a battery.

     

    I can vouch for this one working good at powering up a fully loaded A8 system.

     

    MFG_SWI10-N_BarrelPlug_sml.jpg

    Manufacturer: CUI P/N: SWI10-5-N-P5

    Vendor: Digi-Key P/N: 102-4136-ND

     

     

    Bravo..

     

    Now my next project is to rework a failed Atari 800 power board and get rid of the bad power supply caps, chop out the 5V and 12V regulators and just power the computer with a multivolt class 3 switcher supply like from a small ibm pc desktop supply. I have about 3 +5/+12VDC supplies rated for 2A each that look clean on the scope. Not pulsing, but were used to power external hard drive and cdrom drives..

     

    I'll post the mod to the 400/800 internal board so you keep the SIO and video sockets.

     

    Here's the supply I have.. $5.99 Amazon

    https://www.amazon.com/Vktech-Adapter-Hard-Disk-Power-Supply/dp/B00D2LS2AO


  5. I discovered some RFI interference that bleeds into the Atari 800 video display circuit from when I have the SIO2PC cable plugged in.

    It's an AC ripple leaking into the display. I think a protection cap from RT/.TX to ground and possible a diode forward biased from the Atari to the 800 to the PC on the ground side might be in order.
    If I unplug the SIO2PC cable while the Atari is running, the ripple goes away.

    I am going to do some more probing and testing to figure out where the rogue signal is coming from.

    It affects both of the SIO2PC cables I made with either a female or male plug in on the Atari end.

    Then again the shitty RFI that radiates from the power panels on the other side of my apartment wall might be cause. There are a bunch of breaker panels and transformers less than 6ft from the machine/analog monitor.


  6. Please show us a picture of the drive jumpers, the cable, and the atr 8000 board.

    The doctor and I can verify you have the right settings. I used to have two of those.

    Always turn on the atr 8000 first, the the atari.

    Does it make any noise on the audio channel at all? a "brrrrt", or a squeal, or 'ba deep ba deep ba deep " of a normal load?

    What DOS disk do you have in the drive? just curious.


  7. An Atari 130XE 64KB with a Omnimon XE ROM upgrade for software development.
    The Omnimon mod is switch select on/off for compatibility.
    Includes one Wico Commander joystick with the grommet repaired.
    I am old skool tech from 1990 onward.
    Cleaned, inspected, works great.
    Includes 1.5 A power supply brick, not the cheap 1 A.
    Built in programming BASIC ROM.
    Includes monitor cable for composite, luma/chroma (best), and mono audio.
    The case is slightly yellow, but a good candidate for retrobrighting.
    The 1702 monitor was the best television computer monitor in its class with great color and low dot pitch.
    Works on Apple, Commodore, Amiga computers.
    It is also a great regular NTSC television.
    Ships from 98686 USA 30 lbs
    Dave
    360 nine 8 o 79 eight 4

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  8. This is a strange motherboard, runs for about two hours then locks up with video and audio random scrambles on the screen. When powered cycle it will run normally for another 1-2 hours.

    I tried swapping out the OS card, RAM, and POKEY with known working chips.

    The board was cleaned and so was the keyboard. Case was cleaned. A good candidate for retrobrite.

    It might be one electrolytic cap on the middle left of the main board that needs replacement.

     

    The keyboard port works, video port works, SIO port works, all the joystick ports work.

    Includes keyboard, power socket works.
    The electrolytc caps, and regulators on the power supply board were replaced and tested ok for voltages.

    Shipping from 98686 17lbs.

     

     

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  9. Here is a working, hard to find 80 column display card from Newell Industries called the Ramrod.

    Paper manual and installation instructions included.
    This card replaces the OS card with a OS B, The fast math ROM, and your choice of Omniview, omnimon, or 4KB SRAM in the address space of c000-cffff.

     

    Incliudes the Omniview 80 column display rom add on. Toggles on in basic or DOS by jumping to address C000 or calling x=usr(49152).

    You can also swap that rom chip for the Omnimon for assembler/testing/cracking.

    Included is 2 2KB SRAMs it you want to use that 4KB space for programs.

    The display looks best using a monitor that uses separate luma and chroma and plug in only the luma.

     

    Manual and documentation on archive.org

    Free flat rate shipping USPS to the US.

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  10.  

    Now for the noob questions...

     

    I intend to try to build a 10502PC with another of the FTDI boards and use ALIBPC to create a DOS XE disk on an XF551, but if I can load DOS XE from the laptop with the XF551 as D2: I should be able to format a disk on the XF551 and write DOS XE to it, no?

     

    I just wanted to add that you don't need to won a 3-D printer or have a friend with one, you can get the item printed directly from the web page and have it shipped to you. Sorry, I don't know the cost. All I know is that it took 6 hours to print all 3 pieces on my friend's printer, which is not nearly as impressive as the appearance of the part. I you decide to go that route, let us know how it turned out for you (and the cost, of course). I'd suggest getting it printed in clear plastic so that the lights can be seen through the shell.

     

    I'm also thinking about trying my hand at editing the design to change the internal structure so that it holds the board in place, and replace the post for the screw with external snaps to hold the shell together.

    Sorry for the delay the flu bug bagged both my girlfriend and me.

     

    Yes, you can use other physical disk drives mounted as D2: if you want to in tandem with the SIO2PC as D1: running RespeQt.

     

    You can also boot from the sio2pc on D1: , then turn on your disk drive as D1: and use it on the 8bit. You can even mount a new blank image as D2-8: on the RespeQT software and write to it from DOS XE running on your 8bit.

     

    I think you need a 10502pc or APE to write floppy disks directly with the SIO2PC RespeQT cable. Anyone tried it?

     

    Right now I will just order some 3d printed cable ends. When I get some time, I am ordering some sio cable shells printed.

    I am still tempted to get with the future and start CADing up some prototype parts for a machine I have in mind. (Like a year from now).

     

    Cheers.


  11. Where are you located?

    Vancouver, WA near Portland, OR. Local pickup available. I came across a 15" Samsung LCD television that needs a 12v 3A power supply also. I got the flu from my girlfriend/ Pretty darn sick after a few days of fighting o it off. Damn that H3N2. I will hose the thing off with lysol before shipping..


  12. One Atari 800 from storage from the BBS operator of the Action Annex BBS. I have been an electronics technician for 25 years and serviced equipment up to server level contracts. The 800 has 48KB and monitor cable and power supply. Repaired the integrated power supply caps and regulators. One has the transformer built into the chassis with a fan added with vent holes in the RF shield and plastic ram card holder. The vented Atari had the pokey chip replaced with a known good working spare.
    I cleaned the case, completely disassembled and visually inspected. They were in a storage unit in a box for more than 10 years.
    This 800 have been used for a month since coming out of storage from a friend who had to hastily move in with relatives across the US. It is a NTSC OS B model.

    I was already stood up on Ebay for international buyers. So, no. If you want it, get a friend in the US to buy it for you and ship it to you. Ships from zip code 98686 at 15 lbs.
    This one does not have a cartridge door. It has the chassis switch bypassed to the closed position. So you use the power switch to cycle the machine and switch cartridges.
    The vented "Venti" 800 still has the 800 power socket if you want to use an external power supply instead of the internal transformer later. You will have to remove the internal transformer if you want to go external.
    The internal transformer is also fuse protected and chassis grounded to the board for safety. I am anal about that. It is rated from 115VAC 60 hz use only. The fan is powered by a small 12VDC wall wart on it's own AC cord.
    It has been running for two months solid with no hangs, lockups, since the power supplies were rebuilt. Ran through many .ATR images, created and archived 400 floppy images for archiving of the BBS disks.

    If you want the set of ram cartridge cases for the Venti Atari, I can throw them in.
    Includes a 5 pin din to luma/chroma or composite video cable, and mono audio of course.
    75 + shipping

    I have another Atari 800 for parts going up for sale soon.

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    • Like 1

  13. Using the source code I made a trainer hacked version of Star Raiders 2018..
    I finally can pass Star Commander Class 4.

     

    The trainer version.
    Changed copyright line to a title declaring it a trainer so there aren't funny videos claiming pwning the game when it's a hack.

    Shields take all hits do no damage.

    Reduced energy usage that determines final score.

    The shields, computer, and tracking all take zero energy.

    The engines run at any speed with power level 2 consumption.

    Hyperwarp takes only 1-2 sector jump chunks of energy no matter the distance.

    Calls you a "CHEATER" instead of "CONGRATULATIONS" instead at the end.

    A few ATASCII changes here, a few NOPs there, tested it. Got it right I think. Maybe two hours of fun.

     

    I used the PC based Omnivore editor. Onimon to stop and check registers along the way.

    Star_Raiders_Trainer_2018.xex

    • Like 4

  14. Just helping out the best I can. I plan on soldering those terminals just to be anal after crimping. Fill the enclosure with hot glue or JB Weld once it's solidly tested.
    Heck, I might just crank out a few sets of FTDI USB/SIO cables for Ebay just to feed the Atarimania habit I have acquired.


  15. Thanks for this Christmas present!

     

    Can Altirra load >10K Firmware / OS for 400/800 emulation? I am trying to test the attached 16K OS file consisting of 4K Omnimon 800, 2K of empty space, 2K of Fastchip and 8K of Newell OS N. While all of this runs perfectly in XL mode and a 10K file with Fastchip and OS N only runs in 400/800 mode, the 16K firmware is apparently not loaded at C000 in 400/800 modes. There is an "option" field in the firmware definition dialog but it is not accessible.

     

     

    16K Firmware with Omnimon 800, Fastchip and OS N: attachicon.gifOSNFastOmni.bin

     

    10K Firmware with Fastchip and OS N: attachicon.gifOSNFast.bin

     

     

    Did you see my posting about the rom download from the Newell Omniview board? I did a dump of it with the Omniview and the Omnimon 800 installed in the last socket of the board that resides from C000-CFFF. I wonder where the option is to load roms into that space with Altirra. I really want to reverse engineer this board and make a bootstrap loader of sort eventually.

     

    I would like to see this feature if possible to be able to load roms other than stock. I know it would be on an as-is basis that could crash the emulator.

    AtariROMDumper.atr

    omniview800_c000.rom

    Omnimon_rom800.rom

    • Like 1

  16. Great utility.!!
    Been looking for something like this in the past few months.
    Just hacked out a Star Raiders trainer mod.

    Shields take all hits, no damage.

    Energy drain greatly reduced. Full speed engines takes same amount as speed 2.

    Title screen edited directly with text window was handy.

    Discovered "M" key to select alternate target. Never knew about that feature.

    • Like 1
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