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XT-IDE rev 4 Development

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    #91
    Originally posted by glitch View Post
    That's a very recent build from the looks (the orange Sprague capacitors are a recent part switch), you shouldn't have latch issues, that was a very limited issue. Is your board from a kit, or did I assemble it? If it was assembled here, it was tested in my IBM 5160 PC/XT, so the latch issue would've been caught anyway.
    It was a kit I assembled. I purchased it on your ebay store back in the middle of may. I double checked the solder joints and they looked really good. At this point I am not too worried about it. I have already ordered 2 TI 573 IC's from mouser that should be in probably tomorrow so I will report back once I get them installed.

    Comment


      #92
      I got the 573 IC's installed yesterday. The partitions seem to stick now pretty consistently between reboots, but I am still getting the invalid drive specification when trying to format the drive even though FDISK shows the partition as D:. I am booting off a 42MB RLL drive as drive C if that makes a difference, but I have tried disconnecting it and booting from a 3.31 floppy. Maybe it is from using this 3.31 version of DOS. I may try DOS 4.01 just to see if it does the same thing, I would love to use 3.3 if I could get more than 32MB partitions.

      Comment


        #93
        You should probably run WIPEDISK against your drive first, and then do another FDISK and FORMAT. Here's WipeDisk:

        https://www.lo-tech.co.uk/wiki/WipeDisk
        Check out The Glitch Works | My Retro Projects | Vintage Computer Services | Glitch Works Tindie Store -- Vintage Computer Kits and More

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          #94
          I created a bootable floppy and ran WIPEDISK. Afterword it did the same thing with this Sandisk extreme iii 2GB flash, the partition will stick, but I get invalid drive specification everytime I try to format. I did all this with the RLL drive + controller removed from the system.

          I managed to get a sandisk extreme ii 512MB CF card and this seems to work perfectly. One funny thing I noticed is both the 512MB and 2GB cards show 993 total cylinders in FDISK (v3.31).

          So to sum up, I don't know if the XT-IDE ever had a hardware issue,but I do remember scratching my head a few times cause my partitions would disappear after rebooting, but maybe it was the CF cards as I have about 15 or so cards, but 2GB was my smallest one I had til I got this 512MB.

          Comment


            #95
            Originally posted by lowlytech View Post
            Maybe it is from using this 3.31 version of DOS. I may try DOS 4.01 just to see if it does the same thing, I would love to use 3.3 if I could get more than 32MB partitions.
            What's wrong with using MS-DOS 6.22? You get the same FAT16 structure and less bugs. Is there a reason you're limiting yourself to Compaq DOS 3.31?
            Offering a bounty for:
            - A working Sanyo MBC-775 or Logabax 1600
            - Music Construction Set, IBM Music Feature edition (has red sticker on front stating IBM Music Feature)

            Comment


              #96
              Just wanted the authentic feel of an os from the late 80's, but still wanted large partition support. To me nothing beats 6.22, but for an 8088, i kinda like the feel of an older dos version.

              Comment


                #97
                I have a question on the XT-IDE rev4 schematics: why is D7 (from the IDE connector) pulled down to ground through a 10k resistor?

                xtide_rev4_d7.JPG

                Comment


                  #98
                  So when there are no drives / nothing driving the data bus during register reads, the IDE status register busy bit (bit 7) will be pulled to deterministic level.
                  "Good engineers keep thick authoritative books on their shelf. Not for their own reference, but to throw at people who ask stupid questions; hoping a small fragment of knowledge will osmotically transfer with each cranial impact." - Me

                  Comment


                    #99
                    Originally posted by eeguru View Post
                    So when there are no drives / nothing driving the data bus during register reads, the IDE status register busy bit (bit 7) will be pulled to deterministic level.
                    Thanks!

                    Comment


                      I don't know if this is the case for your particular card, but sometime around 2007 I had to stop using SanDisk Extreme CF cards in embedded builds due to SanDisk intentionally crippling the native IDE mode on them. I forget which cards it specifically included, but apparently they didn't like that people were using their high-end consumer CF cards as SSDs, instead of buying their much more expensive IDE SSDs or "industrial" rated CF cards.

                      You can find a lot of reports from the embedded Linux/homebrew router community at the time.
                      Check out The Glitch Works | My Retro Projects | Vintage Computer Services | Glitch Works Tindie Store -- Vintage Computer Kits and More

                      Comment


                        Originally posted by glitch View Post
                        I don't know if this is the case for your particular card, but sometime around 2007 I had to stop using SanDisk Extreme CF cards in embedded builds due to SanDisk intentionally crippling the native IDE mode on them. I forget which cards it specifically included, but apparently they didn't like that people were using their high-end consumer CF cards as SSDs, instead of buying their much more expensive IDE SSDs or "industrial" rated CF cards.

                        You can find a lot of reports from the embedded Linux/homebrew router community at the time.
                        I see. Is the D7 pull-down a way to circumvent this crippling?

                        Comment


                          Originally posted by Valerio View Post
                          I see. Is the D7 pull-down a way to circumvent this crippling?
                          No, it's part of the ATA/IDE spec.
                          Check out The Glitch Works | My Retro Projects | Vintage Computer Services | Glitch Works Tindie Store -- Vintage Computer Kits and More

                          Comment


                            I guess this thread is as good as any so here goes nothing;

                            With XT-IDE cards in High Speed mode, writes are done with two 8-bit OUTs and reads are done with a single 16-bit IN.

                            Question: can reads be done using two 8-bit INs? Something like this;
                            Code:
                            %ifdef USE_186	; INS instruction available
                            	insb				; Load low byte from port DX to [ES:DI]
                            	inc	dx			; IDE Data Reg to XTIDE Data High Reg
                            	insb				; Load high byte from port DX to [ES:DI]
                            	dec	dx			; Restore to IDE Data Register
                            %else	; If 8088/8086
                            	in	al, dx			; Load low byte from port
                            	inc	dx			; IDE Data Reg to XTIDE Data High Reg
                            	stosb				; Store byte to [ES:DI]
                            	in	al, dx			; Load high byte from port
                            	dec	dx			; Restore to IDE Data Register
                            	stosb				; Store byte to [ES:DI]
                            %endif
                            If possible, then this would allow for slightly faster reads on Olivetti M24 and friends.
                            Looking for a cache card for the "ICL ErgoPRO C4/66d V"

                            Comment


                              I'm lacking some context here -- isn't 2 8-bit reads and 2 8-bit writes how the bios normally works if not configured for anything faster? How would this make things faster?

                              M24 background: M24 and clones don't handle 16-bit operations on the bus properly without hardware modification to the M24; search this forum for research into the "bus conversion kit"). I remember (nearly a decade ago) when I tried, my KINGSTON CF card showed up as "IKGNTSNO" and of course nothing worked past that. Reconfiguring for plain XT got everything working on the M24.
                              Offering a bounty for:
                              - A working Sanyo MBC-775 or Logabax 1600
                              - Music Construction Set, IBM Music Feature edition (has red sticker on front stating IBM Music Feature)

                              Comment


                                The issue is to do with the byte ordering to trigger the command pass through to the media.

                                Iirc in the Olivetti, the bus ordering of the 16 bit commands when made to an 8 bit device is reversed. But I don’t really follow the question, about using two commands instead of one?

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