Announcement

Collapse

Forum etiquette

Our mission ...

This forum is part of our mission to promote the preservation of vintage computers through education and outreach. (In real life we also run events and have a museum.) We encourage you to join us, participate, share your knowledge, and enjoy.

This forum has been around in this format for over 15 years. These rules and guidelines help us maintain a healthy and active community, and we moderate the forum to keep things on track. Please familiarize yourself with these rules and guidelines.


Remain civil and respectful

There are several hundred people who actively participate here. People come from all different backgrounds and will have different ways of seeing things. You will not agree with everything you read here. Back-and-forth discussions are fine but do not cross the line into rude or disrespectful behavior.

Conduct yourself as you would at any other place where people come together in person to discuss their hobby. If you wouldn't say something to somebody in person, then you probably should not be writing it here.

This should be obvious but, just in case: profanity, threats, slurs against any group (sexual, racial, gender, etc.) will not be tolerated.


Stay close to the original topic being discussed
  • If you are starting a new thread choose a reasonable sub-forum to start your thread. (If you choose incorrectly don't worry, we can fix that.)
  • If you are responding to a thread, stay on topic - the original poster was trying to achieve something. You can always start a new thread instead of potentially "hijacking" an existing thread.



Contribute something meaningful

To put things in engineering terms, we value a high signal to noise ratio. Coming here should not be a waste of time.
  • This is not a chat room. If you are taking less than 30 seconds to make a post then you are probably doing something wrong. A post should be on topic, clear, and contribute something meaningful to the discussion. If people read your posts and feel that their time as been wasted, they will stop reading your posts. Worse yet, they will stop visiting and we'll lose their experience and contributions.
  • Do not bump threads.
  • Do not "necro-post" unless you are following up to a specific person on a specific thread. And even then, that person may have moved on. Just start a new thread for your related topic.
  • Use the Private Message system for posts that are targeted at a specific person.


"PM Sent!" messages (or, how to use the Private Message system)

This forum has a private message feature that we want people to use for messages that are not of general interest to other members.

In short, if you are going to reply to a thread and that reply is targeted to a specific individual and not of interest to anybody else (either now or in the future) then send a private message instead.

Here are some obvious examples of when you should not reply to a thread and use the PM system instead:
  • "PM Sent!": Do not tell the rest of us that you sent a PM ... the forum software will tell the other person that they have a PM waiting.
  • "How much is shipping to ....": This is a very specific and directed question that is not of interest to anybody else.


Why do we have this policy? Sending a "PM Sent!" type message basically wastes everybody else's time by making them having to scroll past a post in a thread that looks to be updated, when the update is not meaningful. And the person you are sending the PM to will be notified by the forum software that they have a message waiting for them. Look up at the top near the right edge where it says 'Notifications' ... if you have a PM waiting, it will tell you there.

Copyright and other legal issues

We are here to discuss vintage computing, so discussing software, books, and other intellectual property that is on-topic is fine. We don't want people using these forums to discuss or enable copyright violations or other things that are against the law; whether you agree with the law or not is irrelevant. Do not use our resources for something that is legally or morally questionable.

Our discussions here generally fall under "fair use." Telling people how to pirate a software title is an example of something that is not allowable here.


Reporting problematic posts

If you see spam, a wildly off-topic post, or something abusive or illegal please report the thread by clicking on the "Report Post" icon. (It looks like an exclamation point in a triangle and it is available under every post.) This send a notification to all of the moderators, so somebody will see it and deal with it.

If you are unsure you may consider sending a private message to a moderator instead.


New user moderation

New users are directly moderated so that we can weed spammers out early. This means that for your first 10 posts you will have some delay before they are seen. We understand this can be disruptive to the flow of conversation and we try to keep up with our new user moderation duties to avoid undue inconvenience. Please do not make duplicate posts, extra posts to bump your post count, or ask the moderators to expedite this process; 10 moderated posts will go by quickly.

New users also have a smaller personal message inbox limit and are rate limited when sending PMs to other users.


Other suggestions
  • Use Google, books, or other definitive sources. There is a lot of information out there.
  • Don't make people guess at what you are trying to say; we are not mind readers. Be clear and concise.
  • Spelling and grammar are not rated, but they do make a post easier to read.
See more
See less

MAC iicx

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

    #31
    Originally posted by Timo W. View Post
    The Performa 6200 may only support VGA resolutions.
    The machine has 1 mb of shared video memory and supports 640x480 @ 15bpp, or 800x600 and 832x624 @ 8bpp.

    Owing to the junk architecture of the Performa 62xx (putting a 64 bit CPU on a 32 bit bus, and using 68040 and 68030 bus emulators with slower devices), higher resolutions make the machine even slower than it already is. I had a Performa 6320 which used the same architecture with a faster 120 MHz 603e and it was just as painful.

    Comment


      #32
      Originally posted by GiGaBiTe View Post
      The machine has 1 mb of shared video memory and supports 640x480 @ 15bpp, or 800x600 and 832x624 @ 8bpp.

      Owing to the junk architecture of the Performa 62xx (putting a 64 bit CPU on a 32 bit bus, and using 68040 and 68030 bus emulators with slower devices), higher resolutions make the machine even slower than it already is. I had a Performa 6320 which used the same architecture with a faster 120 MHz 603e and it was just as painful.
      Should it respond to standard monitor sense codes ?
      Current fleet
      TRS80 Model 4 - BBC B - Tatung Einstein - PCW9512 - PET 3032 - C64 - ZX81 - Spectrum 48K - Amiga A500 - Apple II europlus - Apple iMAC G3. Sharp MZ-80K. - IBM 5160 XT - Multibus 286/10 - Micro PDP 11/73 - Rainbow PC100A - MicroVax II - MicroVAX 3100, 3300, VAX 4000 VLC & 4000 Model 96 - AlphaStation 225Apricot PC - Apple Performa 6200 - Apple Mac IIcx

      Comment


        #33
        Your mileage may vary, there be dragons.

        https://wiki.preterhuman.net/Macinto...or_Sense_Codes

        If by "standard" you mean Apples' usual cornucopia of nonsense, then yes.

        Comment


          #34
          Originally posted by GiGaBiTe View Post
          Your mileage may vary, there be dragons.

          https://wiki.preterhuman.net/Macinto...or_Sense_Codes

          If by "standard" you mean Apples' usual cornucopia of nonsense, then yes.
          I meant the standard 3 bit code rather than the extended codes.
          Current fleet
          TRS80 Model 4 - BBC B - Tatung Einstein - PCW9512 - PET 3032 - C64 - ZX81 - Spectrum 48K - Amiga A500 - Apple II europlus - Apple iMAC G3. Sharp MZ-80K. - IBM 5160 XT - Multibus 286/10 - Micro PDP 11/73 - Rainbow PC100A - MicroVax II - MicroVAX 3100, 3300, VAX 4000 VLC & 4000 Model 96 - AlphaStation 225Apricot PC - Apple Performa 6200 - Apple Mac IIcx

          Comment


            #35
            I don't know which standard the Performa 6200 uses.

            Comment


              #36
              Anyway, back to the focus of the thread.

              The IIcx keyboard is totally stripped and cleaning is underway. I have had some luck with using HG Mould spray to help clean the plastics. Doesn't whiten quite like retrobright but has certainly made it look much better (its basically Sodium Hypochlorite and Sodium Hydroxide in solution).

              Probably will need a new HD.

              I have used the 80 pin to 50 pin adapters on DEC equipment with success, anyone tried a 20gb hd in a 68k mac ?
              Current fleet
              TRS80 Model 4 - BBC B - Tatung Einstein - PCW9512 - PET 3032 - C64 - ZX81 - Spectrum 48K - Amiga A500 - Apple II europlus - Apple iMAC G3. Sharp MZ-80K. - IBM 5160 XT - Multibus 286/10 - Micro PDP 11/73 - Rainbow PC100A - MicroVax II - MicroVAX 3100, 3300, VAX 4000 VLC & 4000 Model 96 - AlphaStation 225Apricot PC - Apple Performa 6200 - Apple Mac IIcx

              Comment


                #37
                If the SCSI drive supports operating in 8 bit single ended mode, it should work. But you need to be careful about using newer SCSI drives because they draw quite a bit of power and can overload the generally anemic power supplies used in old 68k macs.

                SCA-80 drives are usually 10-15k rpm drives and can pull a few amps each.

                The other limitation is that Mac OS prior to 8.0 only supports HFS, which has a partition size limit of 2 GB. HFS+ introduced in Mac OS 8.0 supports up to 4 GB partitions, but both are not particularly robust file systems and have problems with large partitions and massive data corruption. I would stick with partitions of 1 GB or less to reduce the risk of data corruption.

                Another problem is that you'll need to use the patched version of Apple HD SC Setup to format non-apple drives.

                Comment


                  #38
                  Keyboard back together but the caps lock key was a nightmare

                  The downlock wasn't working and the little copper pawl was not flicking across when the key was pressed down. Took it apart and the pawl was bent and cracked when trying to bend it back.
                  Made up a new one from a small bit of wire, bent to shape and its back working again (for now) but was really fiddly.

                  Hard drive heads were stuck, but I don't have my video lead setup for this machine so cant see if its now booting (but sounds like it) so need to make up a new lead.
                  Current fleet
                  TRS80 Model 4 - BBC B - Tatung Einstein - PCW9512 - PET 3032 - C64 - ZX81 - Spectrum 48K - Amiga A500 - Apple II europlus - Apple iMAC G3. Sharp MZ-80K. - IBM 5160 XT - Multibus 286/10 - Micro PDP 11/73 - Rainbow PC100A - MicroVax II - MicroVAX 3100, 3300, VAX 4000 VLC & 4000 Model 96 - AlphaStation 225Apricot PC - Apple Performa 6200 - Apple Mac IIcx

                  Comment


                    #39
                    Could not resist. Modified the Performa's cable and got the display back on the IIcx and it boots

                    However, the hard drive is playing silly buggers. When powered down and the heads go to the parked position, they then won't move until they are nudged again. There appears to be no static friction in the bearing (though obviously that is really hard to tell) and once off the landing zone, they move freely until powered down again. The head lock vane is moving away from the head before the heads try to move so its not getting stuck on that either.

                    Probably will end up replacing the HD after all which is a shame as it almost works.
                    Current fleet
                    TRS80 Model 4 - BBC B - Tatung Einstein - PCW9512 - PET 3032 - C64 - ZX81 - Spectrum 48K - Amiga A500 - Apple II europlus - Apple iMAC G3. Sharp MZ-80K. - IBM 5160 XT - Multibus 286/10 - Micro PDP 11/73 - Rainbow PC100A - MicroVax II - MicroVAX 3100, 3300, VAX 4000 VLC & 4000 Model 96 - AlphaStation 225Apricot PC - Apple Performa 6200 - Apple Mac IIcx

                    Comment


                      #40
                      Ah ha !

                      The Quantum prodrive disks have a known issue with sticky rubber bumpers. Surprisingly people have stripped down the actuator and replaced them on the LPS versions successfully without destroying the platters but the ELS seems to have a bumper under the bottom platter which is a none starter to remove.

                      https://68kmla.org/forums/topic/5470...r-replacement/

                      Looks like the easiest method to restore this drive, is to put some rubber squashed in to touch the armature to prevent the head sticking on the bumper under the platter. Job for tomorrow

                      If I do replace the drive, it looks as if any low cost replacement would pull about 0.8A on the +5 and +12 lines which would be about 14W, which I would have thought should not be a struggle for the 150W psu (I hope). Worth a try anyway.

                      But the machine itself works a treat in glorious 16 colours. Anyone know the SIMM spec to upgrade the 4.8 card ?
                      Current fleet
                      TRS80 Model 4 - BBC B - Tatung Einstein - PCW9512 - PET 3032 - C64 - ZX81 - Spectrum 48K - Amiga A500 - Apple II europlus - Apple iMAC G3. Sharp MZ-80K. - IBM 5160 XT - Multibus 286/10 - Micro PDP 11/73 - Rainbow PC100A - MicroVax II - MicroVAX 3100, 3300, VAX 4000 VLC & 4000 Model 96 - AlphaStation 225Apricot PC - Apple Performa 6200 - Apple Mac IIcx

                      Comment


                        #41
                        Originally posted by Gary C View Post
                        But the machine itself works a treat in glorious 16 colours. Anyone know the SIMM spec to upgrade the 4.8 card ?
                        It appears to use Apple's 68 pin VRAM SIMMs, which were also used in many of their 68k machines.

                        These SIMMs were never cheap, and the 512k variants were even more expensive. You can still get them on Ebay:

                        https://www.ebay.com/itm/142042841646

                        Someone made a batch of new sticks:
                        https://www.ebay.com/itm/114752740832

                        Just keep in mind that the Macintosh 4.8 Display Card is not accelerated, so higher resolutions and bit depths are going to be slower.

                        Comment


                          #42
                          Found some originals for 6 which seems a bargin (if they work)

                          Speed is a moot point I suppose, these machines are never going to be fast, I just like to have everything working.

                          Which brings me to the floppy. It won't format and won't eject a disk so more tinkering required.
                          Current fleet
                          TRS80 Model 4 - BBC B - Tatung Einstein - PCW9512 - PET 3032 - C64 - ZX81 - Spectrum 48K - Amiga A500 - Apple II europlus - Apple iMAC G3. Sharp MZ-80K. - IBM 5160 XT - Multibus 286/10 - Micro PDP 11/73 - Rainbow PC100A - MicroVax II - MicroVAX 3100, 3300, VAX 4000 VLC & 4000 Model 96 - AlphaStation 225Apricot PC - Apple Performa 6200 - Apple Mac IIcx

                          Comment


                            #43
                            I'd suspect the grease in the drive has turned hard and crusty. As for not ejecting, either the grease dried up in the eject motor gearbox, or the plastic gears inside turned to dust.

                            You can use alcohol on a swab to remove the dried grease and then re-apply some light lithium grease to the worm drive and silicone spray to the sliding parts. For the gearbox, I'd just open it and hose the gears down with silicone spray and wipe away the excess. If you see any with broken teeth, you'll need to find replacements.

                            Comment


                              #44
                              Floppy is a bit worse for wear.

                              The top head sits off the disk. Looks as if its been lifted too high in the past, probably to clean the head and bent the mounting leaf. Bent back and the head spring moved to a higher setting and the head will now make contact with the disk.

                              Drive gears look intact but need a greasing, but the head shaft seems a bit bent (!) in that its sticking in parts when through both holes. Will need a bit of working to get it to slide properly.

                              Must have had an interesting life.

                              I do wonder though if the BMOW emu would be a better bet.
                              Current fleet
                              TRS80 Model 4 - BBC B - Tatung Einstein - PCW9512 - PET 3032 - C64 - ZX81 - Spectrum 48K - Amiga A500 - Apple II europlus - Apple iMAC G3. Sharp MZ-80K. - IBM 5160 XT - Multibus 286/10 - Micro PDP 11/73 - Rainbow PC100A - MicroVax II - MicroVAX 3100, 3300, VAX 4000 VLC & 4000 Model 96 - AlphaStation 225Apricot PC - Apple Performa 6200 - Apple Mac IIcx

                              Comment


                                #45
                                Next problem, disk not spinning. Bit of metal stuck under disk drive motor, had to drive out the shaft and remove the lower plate to get it out, reassembled and spinning smoothly. Eject motor a bit stiff, bit of grease and now ejecting smoothly. Heads now in contact with disk.

                                But, when I format a disk, it steps from 0 to 79 ok but verify fails.

                                Need to test the heads for continuity, then check if I am getting a write signal.

                                Using HD disks which I imagine is ok ?
                                Current fleet
                                TRS80 Model 4 - BBC B - Tatung Einstein - PCW9512 - PET 3032 - C64 - ZX81 - Spectrum 48K - Amiga A500 - Apple II europlus - Apple iMAC G3. Sharp MZ-80K. - IBM 5160 XT - Multibus 286/10 - Micro PDP 11/73 - Rainbow PC100A - MicroVax II - MicroVAX 3100, 3300, VAX 4000 VLC & 4000 Model 96 - AlphaStation 225Apricot PC - Apple Performa 6200 - Apple Mac IIcx

                                Comment

                                Working...
                                X