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  1. RichCini

    More Lomas projects -- SCSI board

    At $375, seems like it was a bargain given what it provided feature-wise. Thanks for posting the spec sheet; I didn't see that before. Rich
  2. RichCini

    More Lomas projects -- SCSI board

    All -- I have prototype Thunder 186 boards on-order and I should have them in a few weeks. The PALs have been decoded and they work, so I feel this project will close-out more quickly than the Color Magic. So, I'm on the hunt for the next board to do which is the SCSI board. From the pictures...
  3. RichCini

    Next Lomas project - Thunder 186

    I also just noticed that three fields of the DPB - # of FAT sectors, # of heads, and # of hidden sectors — seem to be byte swapped (MSB, LSB) as compared to a normal DPB. So it would reports SPT as 0800 rather than 0008. I’m going to look for a generic DOS 2.11 image and look at it. Not sure...
  4. RichCini

    Next Lomas project - Thunder 186

    They are raw images converted to HFE. However, now that I actually parsed the DPB, I need to remake the HFE with the right parameters. I assumed it was a 360k image.
  5. RichCini

    Next Lomas project - Thunder 186

    Also…the LDP DOS 2.0 disk is 320k, not 360k, based on the parameter block in the image. Based on this I’m going to try some of my disk tools again with custom parameters.
  6. RichCini

    Next Lomas project - Thunder 186

    Ok, some interesting info. The first DOS 2.0 image is clearly LDP custom -- I don't have any programs that can read and interpret the boot sector. I added the AA55h signature but that didn't matter for the GoTek/FlashFloppy. The second image has a an OEM system name of "MSWIN4.1" which tells me...
  7. RichCini

    Next Lomas project - Thunder 186

    Hmmm. Interesting. I’ll look at that. There might be a way to have it ignore the signature.
  8. RichCini

    Next Lomas project - Thunder 186

    The images of DOS 2.1 I have don’t seem to boot with my Gotek’s for some reason. I have a version of DOS 3 which boots perfectly and is pretty snappy. {Ed: this came from @new_castle_j, who also supplied the original boards used for testing and comparison}
  9. RichCini

    Next Lomas project - Thunder 186

    Al — the manual for the T186 references a driver disk of some sort but I don’t have it. It also doesn’t have a complete BIOS listing so I can’t tell how “compatible” it is. But, it will run DOS 3 and I’ve run a graphics-heavy game or two. I have to try some other games like from Sierra, and...
  10. RichCini

    Next Lomas project - Thunder 186

    Ha, yeah, I know what that's like...
  11. RichCini

    Next Lomas project - Thunder 186

    I guess I'm not opposed to that for a single chip for me, but I'm thinking of ease for various builders. It seems that anything from Alliance that's 16-bit wide is the TSOP package.
  12. RichCini

    Next Lomas project - Thunder 186

    Ok, here's what I have so far. This is the rough re-draw that I did, but it's not fully verified. The alternative SRAM setup is on page 7, but I think this might make it easier to compare than the original scans. I'm hoping to get better scans soon. I also plan on hand-verifying each schematic...
  13. RichCini

    Next Lomas project - Thunder 186

    That’s a great idea. I would need 2 to get the 16-bit data width and it would save a ton of chips. Let me look into that more. 512k would definitely be better than 256k. It wouldn't have the parity function but does that really matter? Likely not. I did a similar, but easier, substitution on...
  14. RichCini

    Next Lomas project - Thunder 186

    Since I have the Color Magic reproduction working, I was going to tackle the Thunder 186. This is an 80186-based all-in-one card with a floppy controller and 256k of DRAM. There are only two PALs on it, and they seem to be simple address/status decoders, so I figure they will be easier to...
  15. RichCini

    Is anyone from Lomas Data Products on-forum?

    To conclude, the 3rd prototype board works just fine. It's taken another seven months to bring it over the finish line, but it works. My Github has been updates with the final files and other details. Lomas has a companion 80186 board for which I have the schematics. That's a very tight board...
  16. RichCini

    Sdltrs

    It's taken me a bit to figure this out, so I'm documenting it here so others can find it. Sdltrs will create a container file with a header and when you use the RSHARD5 command, it fills out the container to the final size based on the geometry of the drive you defined when creating the...
  17. RichCini

    Sdltrs

    I just started fiddling around with SDLTRS and LDOS 3.51 on a RetroPie machine I just built. I haven't used RS machines since I worked there in the 1980's so I'm pretty rusty, but getting there. Right now, I'm trying to create a hard drive image and I can't seem to get a valid image size using...
  18. RichCini

    Ampro LB186 SCSI and hard drives/SCSI2SD/Zulu

    Ok, I think I fixed it. I can indeed get it to boot off of SCSI using my SCSI2SD v5.1, but it's revealed another issue with overheating. It seems that after 10 minutes of use, the board stops working and the 80186 is very hot. I ordered a stick-on 22mm^2 heatsink for it, so maybe that'll help...
  19. RichCini

    Ampro LB186 SCSI and hard drives/SCSI2SD/Zulu

    All -- Has anyone gotten a SCSI hard drive working with the Ampro LittleBoard 186? I pulled mine out of storage to try to get a drive working on it and I'm not having much luck with the SCSI2SD that I have. I've defined a drive template based on the Seagate ST-225N (21MB) on a spare SCSI2SD...
  20. RichCini

    86-DOS 0.11 Source Code Reconstruction

    I believe that 0.11 uses a 16-byte directory entry which most modern-ish tools, including DiskExplorer, cannot work with. 32-byte directory entries were added in version 0.42. There might be a way to do it with TotalImage, but I think that requires modifying the code to understand it. I think...
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