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About rcgldr

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    Chopper Commander

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  1. I haven't used Compuserve in decades, but I still have some old binder / manual for it. I even have a 56K baud modem in storage somewhere, but don't know if it still works. I'd have to use my older system, which still has a serial port and a floppy drive, as my newer system doesn't have either.
  2. I see 3 wires coming out from under the board. One wire is common to pin 4 on all piggy backed ram chips. The other 2 go to pin 10's (?), one for pin 10 (?) of the left 8 piggy backed ram chips, one for pin 10 (?) for the right 8 piggy backed ram chips.
  3. The way my board is connected to the case makes it risky to remove. Couldn't you use a needle as a probe and use a beep box or an ohm meter that uses a small voltage (<= 5 volts) to determine which pin is connected to the wire used for the piggy back ram chips?
  4. Link to higher rez image (1.6MB): http://rcgldr.net/atarist/at520st1.jpg It's a "developer" Atari 520 ST, it came with a few "developer" manuals, and developer took kit with Alcyon C compiler, some version of assembler, and I don't recall what else was included.
  5. I found the attached imagaes doing a web search. On my ATR8000, the board that plugs into the Z80 socket faces component down. All it does is provide a port to interface with the 8088 board. That board is under the main board, and I didn't want to risk taking my ATR8000 apart just to take an image. I assume the 8088 board is similar to the one in the attached picture. The copower 88 on my system has 512 KB of ram. I didn't use the MSDOS feature much, and mostly used it as a 512KB ramdisk for CP/M. The MSDOS 2.11 on the copower can read / write 5.25 inch double density 360 KB floppy disks that are compatible with PCs. I modified the software so I could read or write CP/M files while in MSDOS mode, allowing me to interchange CP/M files as well as MSDOS files with a PC (the CP/M write program needs a minor fix, the read program is working).
  6. Attached is an image of the piggy back 1024 MB upgrade to a "developer" Atari 520 ST, where the upgrade was done by Atari itself. Ram chips in my 520ST are all NEC D41256C-15 .
  7. Attached double density ATR file includes ADVENT.COM, which can be read onto a CP/M disk using ICDS copy function. This is the 350 point version, similar or the same one I saw on Radio Shack TRS-80 CP/M systems. The save feature asks for a tape, then messes up, so don't use it. I don't recall how to get it to save to a file. https://en.wikipedia.org/wiki/Colossal_Cave_Adventure advent.atr
  8. The ATR8000 FORMAT doesn't have a /F... in it's parameter table. "/Q" is probably for quad (versus quick), but as posted above "/D" + "/E" matches what I already had, 1.2MB on the 8 inch floppies.
  9. ATR8000 MSDOS FORMAT appears to be modified. I used a debugger to find the switch parameters, as there is no help parameter. Looks like "/E" is for 8 inch double density floppy, and "/D" is for double sided. "/V" is for volume label, which will prompt for the volume label after the format is completed (as opposed to having a parameter like "/V:name"). There is a "/Q", but it's not a quick format option. Using "/D" + "/E" results in the same number of bytes as I see on my current MSDOS floppies.
  10. I have an atr8000 with copower 88, I'm trying to back up the floppies, which I've done for the CP/M floppies, but I haven't figured out how to format MSDOS floppies with the ATR8000. There's a FORMAT.COM command, but I don't know what the parameters are, I can't find my manuals, and the format program doesn't have any help to explain the options. I'm trying to format an 8" floppy disk to be the same as the two MSDOS floppies I already have, with about 1.2MB each. I'm not sure of the sector size or number of sectors per track.
  11. If the ATR8000 is homing / calibrating the floppy head(s), then the code is running. It seems to do multiple calibrate commands in a row upon power up or reset. Some 8 inch floppy drives (like mine) will not move the heads unless a floppy disk is inserted into the drive. My ATR8000 has a switch just above the reset button on the back to change between CP/M mode and Atari peripheral mode. It it's in CP/M mode, then it's expecting a return character on the computer in Atari type connector, either from a terminal or from an emulated terminal, after which it will display ATRMON .. # (I think it uses the return character to determine baud rate of the terminal). At that point you enter "B" to boot CP/M from drive 1. Even if you don't have CP/M, you could try this to see if the ATR8000 attempts to boot from the floppy drive. If it's in Atari peripheral mode, it should be in standard SIO mode. As already posted, for the floppy drives, you want a straight through cable, and drive select normal (versus a PC where both drives are configured as drive 2, and a twisted cable is used for drive A). Note that pin 1 on all the ATR8000 connectors are on the power cord and reset button side of the back of the ATR8000. Looking at the ATR8000 from the back side, all the pin 1's are on the right side of the connectors, with the power cord and reset button on the far right.
  12. With the fan, it seems to be OK. I'm currently working on another project.
  13. The assignments are as I listed in my first post. It's a working setup, but the colors are unusual. The KV1311CR doesn't have a s-video input, just RF (analog TV), composite video and a single audio input, analog RGB (40 pin? connector that works with Atari ST), and digital RGB (unusual shape 8 small angled slot connector, which I never used).
  14. I have an Atari 130XE with a monitor cable with 4 RCA type plugs: red => composite video output yellow => audio output black => ? white => ? Is this a non-standard cable that I have? The color choices seem unusual considering yellow is normally used for composite video output. I'm using a Sony KV1311CR that also has an analog RGB connector that also allows it to be used as a color monitor for the Atari ST using a special monitor cable. Resolution is 640x480.
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