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PS/2 Model 30 8086 BIOS dump?

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    #16
    Here is the comparison of 61X8938 and 61X8940:

    Code:
    61X8938+61X8937........................|61X8940+61X8939........................
    00000000: 3631 5838 393[u][b]3[/b][/u] 3[u][b]8[/b][/u]20- 61X89[u][b]38[/b][/u] |00000000: 3631 5838 393[u][b]4[/b][/u] 3[u][b]0[/b][/u]20- 61X89[u][b]40[/b][/u] 
    00000048: 5858 3838 3939 3[u][b]3[/b][/u]33- XX8899[u][b]3[/b][/u]3|00000048: 5858 3838 3939 3[u][b]4[/b][/u]33- XX8899[u][b]4[/b][/u]3
    00000050: 3[u][b]8[/b][/u]3[u][b]7[/b][/u] 2020 2828 4343- [u][b]87[/b][/u]- ((CC|00000050: 3[u][b]0[/b][/u]3[u][b]9[/b][/u] 2020 2828 4343- [u][b]09[/b][/u]- ((CC
    0000e000: 3631 5838 393[u][b]3[/b][/u] 3[u][b]8[/b][/u]20- 61X89[u][b]38[/b][/u] |0000e000: 3631 5838 393[u][b]4[/b][/u] 3[u][b]0[/b][/u]20- 61X89[u][b]40[/b][/u] 
    0000e6f8: 000[u][b]1[/b][/u] b400 0000 0017- .[u][b].[/b][/u]......|0000e6f8: 000[u][b]2[/b][/u] b400 0000 0017- .[u][b].[/b][/u]......
    0000f1a8: 40ca 0200 fb[u][b]e8[/b][/u] [u][b]ac0[/b][/u]5- @....[u][b]...[/b][/u]|0000f1a8: 40ca 0200 fb[u][b]0a[/b][/u] [u][b]e47[/b][/u]5- @....[u][b]..u[/b][/u]
    0000f1b0: 0a[u][b]e4[/b][/u] [u][b]750a[/b][/u] c[u][b]d4[/b][/u]0 [u][b]f6c2[/b][/u]- .[u][b].u..@..[/b][/u]|0000f1b0: 0a[u][b]cd[/b][/u] [u][b]40f6[/b][/u] c[u][b]28[/b][/u]0 [u][b]74f1[/b][/u]- .[u][b].@...t.[/b][/u]
    0000f1b8: [u][b]807[/b][/u]4 [u][b]ee32[/b][/u] [u][b]e4f[/b][/u]8 [u][b]80fc[/b][/u]- [u][b].t.2....[/b][/u]|0000f1b8: [u][b]32e[/b][/u]4 [u][b]f880[/b][/u] [u][b]fc0[/b][/u]8 [u][b]7505[/b][/u]- [u][b]2.....u.[/b][/u]
    0000f1c0: [u][b]0[/b][/u]87[u][b]5[/b][/u] 0[u][b]5[/b][/u]e[u][b]8[/b][/u] [u][b]7b01[/b][/u] [u][b]ebe1[/b][/u]- [u][b].u..{...[/b][/u]|0000f1c0: [u][b]e[/b][/u]87[u][b]e[/b][/u] 0[u][b]1[/b][/u]e[u][b]b[/b][/u] [u][b]e480[/b][/u] [u][b]fc15[/b][/u]- [u][b].~......[/b][/u]
    0000f1c8: [u][b]80fc[/b][/u] [u][b]1575[/b][/u] 0[u][b]5[/b][/u]e[u][b]8[/b][/u] da[u][b]01[/b][/u]- [u][b]...u..[/b][/u].[u][b].[/b][/u]|0000f1c8: [u][b]7505[/b][/u] [u][b]e8dd[/b][/u] 0[u][b]1[/b][/u]e[u][b]b[/b][/u] da[u][b]e8[/b][/u]- [u][b]u.....[/b][/u].[u][b].[/b][/u]
    0000f1d0: [u][b]ebd7[/b][/u] 5351 521e 0656- [u][b]..[/b][/u]SQR..V|0000f1d0: [u][b]8a05[/b][/u] 5351 521e 0656- [u][b]..[/b][/u]SQR..V
    0000fff0: ea5b e000 f03[u][b]1[/b][/u] 322f- .[...[u][b]1[/b][/u]2/|0000fff0: ea5b e000 f03[u][b]0[/b][/u] 322f- .[...[u][b]0[/b][/u]2/
    0000fff8: 3[u][b]1[/b][/u]3[u][b]2[/b][/u] 2f38 3[u][b]6[/b][/u]00 fa[u][b]b7[/b][/u]- [u][b]12[/b][/u]/8[u][b]6[/b][/u]..[u][b].[/b][/u]|0000fff8: 3[u][b]0[/b][/u]3[u][b]5[/b][/u] 2f38 3[u][b]7[/b][/u]00 fa[u][b]da[/b][/u]- [u][b]05[/b][/u]/8[u][b]7[/b][/u]..[u][b].[/b][/u]
    Everthing looks good.

    Comment


      #17
      Anyone know if the Model 30 BIOS ever had a listing (or a disassembly) published anywhere?

      I suppose that's a big fat "no" at least from IBM's side, since that was right when they furiously back-tracked on "open architecture". I could have a go myself, but maybe some commented disassembly is already lying around somewhere?
      int10h.org :: :: :: blog

      Comment


        #18
        Originally posted by VileR View Post
        Anyone know if the Model 30 BIOS ever had a listing (or a disassembly) published anywhere?

        I suppose that's a big fat "no" at least from IBM's side, since that was right when they furiously back-tracked on "open architecture". I could have a go myself, but maybe some commented disassembly is already lying around somewhere?
        I'm starting work on this at https://github.com/JoshRodd/bios8530

        The PS/2 era did not generally have ROM BIOS listing, but the PC Convertible did. The PC Convertible's BIOS would be the closest recently published thing to the Model 25/30 BIOS.

        My personal agenda is to build a PS/2 Model 25/30 emulator, specifically, an MCGA emulator, probably inside the framework of pcjs.org. My goal of disassembly of the ROM BIOS is to get a better understanding of how the MCGA works, at least in text mode.
        Last edited by MennoJoshua; September 28, 2020, 10:10 AM.

        Comment


          #19
          Here's some more information about the ROM BIOSes that have been published so far:

          Code:
          rombios % ./build_roms.sh
          
             Filenames      ROM    Model                Font vectors           ROM BASIC   Copy-    Part numbers 
            Even    Odd     Date               8x16    8x8 (VGA/MCGA)   8x8      vector   rights    Even     Odd 
          68X1687 68X1627: 09/02/86 8530 8x16: 3960h 8x8V: 4960h 8x8: FA6Eh BASIC: 6000h 1981 1987 68X1645 68X1693  Part number mismatch
          61X8938 61X8937: 12/12/86 8530 8x16: 3A30h 8x8V: 4A30h 8x8: FA6Eh BASIC: 6000h 1981 1987 61X8938 61X8937
          61X8940 61X8939: 02/05/87 8530 8x16: 3A30h 8x8V: 4A30h 8x8: FA6Eh BASIC: 6000h 1981 1987 61X8940 61X8939
          00F2122 00F2123: 06/26/87 8525 8x16: 2F48h 8x8V: 3F48h 8x8: FA6Eh BASIC: 6000h 1981 1987 00F2122 00F2123
          33F4498 33F4499: 01/31/89 8530 8x16: 3A70h 8x8V: 4A70h 8x8: FA6Eh BASIC: 6000h 1981 1989 33F4498 33F4499
          Of note:
          1. 68X1687 and 68X1627 don't match the part numbers actually inside the ROMs.
          2. There is a corrupt version of 00F2122 where the even ROM has bit 2 always set from offset 0 - 2180h (0 - 10C0h in the even ROM itself).
          3. There is a corrupt version of 61X8938 where the even ROM has bit 0 always set in the entire ROM. A date of 13/12/86 means you have this corrupt copy.

          My "splice" tool checks for these specific errors so you can know if you have a bad copy of a ROM. I have more notes about these different ROM versions at https://github.com/JoshRodd/bios8530...c/manifest.txt.
          Last edited by MennoJoshua; September 28, 2020, 10:10 AM.

          Comment


            #20
            Originally posted by fs5500 View Post
            3) 8525 (CPU : 8086)


            06/26/87 --> with P/N 00F2092 and 00F2093
            06/26/87 --> with P/N 00F2122 and 00F2123
            Does anyone know the differences between these two, or else have a copy of 00F2092/00F2093?

            Comment


              #21
              Originally posted by IBMMuseum View Post
              Here is a more complete list of BIOS versions on Model 30:

              FRU 68X1627/87: 09/02/1986. Revision 00
              It would seem this revision is actually 68X1645+68X1693, based on the text inside the .BIN files hosted at http://ibmmuseum.com/BIOS/8530/.

              This forum post dated 2017 comes up for a Google search for "68X1645" "68X1693" with a reference to U20 and U17 as well: https://www.oldcomp.cz/viewtopic.php?f=57&t=5582. Nothing at all comes up for "68X1627" "68X1687" (other than our own forum post here).

              By the way, thanks for your work in getting these ROMs archived and available.

              Comment


                #22
                Originally posted by MennoJoshua View Post
                My personal agenda is to build a PS/2 Model 25/30 emulator, specifically, an MCGA emulator, probably inside the framework of pcjs.org. My goal of disassembly of the ROM BIOS is to get a better understanding of how the MCGA works, at least in text mode.
                Most of that should be documented in the tech refs, but the reason I asked also happens to be MCGA-related.

                Specifically... the tech refs only document two different types of monitor being supported - "Analog Color Display" and "Analog Monochrome Display", both VGA-type (corresponding to "01" and "10" respectively in the "Display Sense Register" index).
                However, it appears that "00" is also supported (although it's listed as "Reserved"), and that it probably indicates a 200-line (15 kHz) monitor of some kind.

                Some unofficial docs e.g. HelpPC claim that this is for "digital color", i.e. plain CGA. But following some discussion on another forum, that MAY not be true after all. I'm rather curious to know what kind of undocumented MCGA feature we have here.
                int10h.org :: :: :: blog

                Comment


                  #23
                  Originally posted by VileR View Post
                  Most of that should be documented in the tech refs, but the reason I asked also happens to be MCGA-related.

                  Specifically... the tech refs only document two different types of monitor being supported - "Analog Color Display" and "Analog Monochrome Display", both VGA-type (corresponding to "01" and "10" respectively in the "Display Sense Register" index).
                  However, it appears that "00" is also supported (although it's listed as "Reserved"), and that it probably indicates a 200-line (15 kHz) monitor of some kind.

                  Some unofficial docs e.g. HelpPC claim that this is for "digital color", i.e. plain CGA. But following some discussion on another forum, that MAY not be true after all. I'm rather curious to know what kind of undocumented MCGA feature we have here.
                  Can confirm, if you don't ground any of the mode sense pins, MCGA goes into 15KHz RGB mode and is NTSC compatible. I verified it on my Sony PVM.
                  IBM PS/2 Model 25, NEC V30 8MHz, 640KB RAM, ATI VGA Wonder XL, 2GB SSD, Ethernet, DR DOS 6/GeOS, Xircom PE3 Ethernet

                  Comment


                    #24
                    "I'm looking for the BIOS of IBM PS/2 8525 286"

                    The Model 25 286 and Model 30 286 share the same planars (plural): A "Type 1" (distinguished by a single 40-pin EPROM) and "Type 2" (the two 27256 we are used to). The same BIOS versions exist in both EPROM styles. Even though the "Type 2" rotates the CPU orientation by 90 degrees, the same Kingston 'LEM' "SX Now!" upgrade works on either planar.
                    Disclaimer: The username IBMMuseum and domain IBMMuseum.com are not affiliated with IBM in any manner

                    Comment


                      #25
                      Originally posted by evildragon View Post
                      Can confirm, if you don't ground any of the mode sense pins, MCGA goes into 15KHz RGB mode and is NTSC compatible. I verified it on my Sony PVM.
                      Thanks, that was more or less the suspicion. So, MCGA *does* have something to show for itself that VGA can't.

                      I'd assume that mode 13h runs as expected on that monitor, just without the double-scanning. If so, that would be the only IBM display standard that supports 256-color 15 kHz analog RGB. What made them so cagey about it is anyone's guess...
                      int10h.org :: :: :: blog

                      Comment


                        #26
                        On a similar note:

                        Is there a way to talk an MCGA into displaying a 640x200 16-color mode?
                        The horizontal resolution is there, the bandwidth is there, but it is not officially supported.
                        Has anyone found a way to do it, anyway?

                        Comment


                          #27
                          Originally posted by VileR View Post
                          Thanks, that was more or less the suspicion. So, MCGA *does* have something to show for itself that VGA can't.

                          I'd assume that mode 13h runs as expected on that monitor, just without the double-scanning. If so, that would be the only IBM display standard that supports 256-color 15 kHz analog RGB. What made them so cagey about it is anyone's guess...
                          In my experimenting it depends. Mode 13h depending on the game either stays in 15.6KHz, but some also switch it to 31.46KHz (These rates are from my oscilloscopes frequency counter, so it might be accurate or off slightly, but being a Tektronix from the 80's that hasn't been serviced in a long while, who knows.)
                          IBM PS/2 Model 25, NEC V30 8MHz, 640KB RAM, ATI VGA Wonder XL, 2GB SSD, Ethernet, DR DOS 6/GeOS, Xircom PE3 Ethernet

                          Comment


                            #28
                            Originally posted by fs5500 View Post

                            2) 8530 (CPU : 80286)

                            08/25/88
                            06/28/89

                            I'm looking for the BIOS of IBM PS/2 8525 286.
                            Do you still need any BIOS dumps with the information that the Model 25 286 and Model 30 286 share planars and BIOS versions? I have the 08/25/1988 version "Type 2" planar pair (30F9579/80) and can dump the 06/28/1989 (which is revision '02') from a "Type 1" (single 40-pin EPROM).
                            Disclaimer: The username IBMMuseum and domain IBMMuseum.com are not affiliated with IBM in any manner

                            Comment


                              #29
                              @IBMMuseum

                              If you do so, I'll appreciate you.
                              I can check and verify it.

                              Also I'm looking for IBM PS/2 8525 Model 286 and IBM PS/2 8560 (80286) BIOS ROM Images.

                              Comment


                                #30
                                Originally posted by fs5500 View Post
                                @IBMMuseum

                                If you do so, I'll appreciate you.
                                I can check and verify it.

                                Also I'm looking for IBM PS/2 8525 Model 286 and IBM PS/2 8560 (80286) BIOS ROM Images.
                                Again, the Model 25 286 (your "8525 286") shares the same planar with the Model 30 286 - I need to look through my systems for a sampling of the "Type 2" planars (two 27x256 EPROMs for BIOS. I'm getting the "Type 1" (a single 40-pin EPROM for BIOS) versions up now.
                                Disclaimer: The username IBMMuseum and domain IBMMuseum.com are not affiliated with IBM in any manner

                                Comment

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