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Ksarul last won the day on May 5 2017

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  1. Look carefully at the top of the picture. There is a highly-disguised 44-pin connector hidden there. Notice the case is a bit thinner there and also just a touch wider. That area is the part that inserts into the console. It helps that I already have one of these, so I know what the device looks like from all angles.
  2. Actually, look carefully: there is a female connector at the top and a male connector at the bottom. I counted the pins carefully, there are 22 of them visible (44 counting the bottom). The GROM Buster fits inline with the boot or other peripherals and lets it remain in place for expanded systems.
  3. I think that you and I may be the only folks out there who actually have originals of both of those cartridges. The cases are interesting too, as they were designed to be used as sideport cartridges (seen with Arcturus and Killer Caterpillar) and as regular cartridge port cases (not known in the wild, but documented in their magazine ads).
  4. Multiplan and the Circuit Analysis 1 (SMU Electrical Engineering) cartridges immediately come to mind, as do several of the Scott Foresman Management cartridges and the Milliken Manager module (this latter needs a disk with several specific files on it, but I have yet to find one to go with the cartridge, which I do have). Logo/Logo II had the Teaching Guide sold as a companion for them.
  5. That is a picture of one of my two EGROM boxes. I've actually done a layout to be able to recreate one (along ith the cartridge board), but I haven't tried to read out the PALs to be able to do so yet. The one in the auction is definitely an earlier version of the box, as it has discrete logic for everything (and may be useful for recreation of the PALs if the ones in mine are locked). My other EGROM also has two additional sockets (like the one in the auction) to make it capable of emulating five GROMs. The modem board is for a sidecar peripheral--not a PEB. I'm still mulling over what that might have been intended for, as the bus isn't passed through.
  6. Just remember that if your controller needs 5V to power it--it is not present on the TI joystick port, so you'd have to supply it externally. That is one major difference between the TI port and the Atari port, the other one is much easier to fix, as it just requires the wires to be moved to a different set of pins for the various directional lines.
  7. I took a quick look at the Dimension 4 today. Looking carefully at it, I am sure of one thing--my parts set is different, very different from the Dimension 4. Some things are the same, but the rest looks like it is an even earlier iteration of the console. getting this working again may be a very interesting project. . .
  8. GROM SIMulator, otherwise known as the silver pizza box. That one may be missing too much to get it functional, as it doesn't look like it was ever complete (missing all the front panel bits). All of the TI GRAM files were in a format usable with this box. I have something like ten disks of them (though there is nothing unique on the disks, they are just directly usable by the GSIM).
  9. This is for those of you interested in seeing the required modifications for one of the prototype boards. It actually has a lot less flying wires than most of the original Horizon variants did. . .
  10. And it looks like they are gone again. . .
  11. It is a GSIM motherboard. . .with the console paddle board cartridge attached. It is missing the switches, power supply, and case. I put the manual for these up on WHT about ten years ago.
  12. O Insane One, looking through the docs that Falcor pointed me to last night, one nugget of data buried in it may be of value. It seems the internal addressing scheme for the HRD 4000 was already configured to allow RAMdisk sizes up to 16M. It couldn't actually USE most of that space due to size limits on the ten drives you could configure, but I suspect that it would have been possible to configure all of the excess space for RAMBO. . .OPA may be able to tell us more there.
  13. It is a RESET button. It forces the console into the power-up routine, takes control, and builds the menu screen with the ROM-only cartridge included. You then select the cartridge and it loads normally. The CorComp Load Interrupt Switch was a different product. I have one of those too.
  14. The chip dead center in the board is a 9902.
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