Recent content by Dale Mahalko

  1. Dale Mahalko

    Weird UNIX minicomputer I once had.. Unisys U6000/65

    Since it had an ISA bus, just plug in a standard ISA VGA card, and viola, it works. The same worked out to be true for an Adaptec single-ended narrow SCSI card, probably AHA1510 (super basic, no boot ROM) or AHA1540 (more capable version). It could boot MSDOS but AFAIK the only intended...
  2. Dale Mahalko

    "standard" I/O compatibility

    While I recognize USB and Ethernet are very common modern interfaces, the bus controller is probably as complicated as an entire 6502 computer or more. It may be best to just target a few modern standards used on Arduino and Raspberry Pi, such as I2C, which supports up to 5 MBit/sec with at...
  3. Dale Mahalko

    Antique floppy disks can harm your computer (Youtube)

    I would expect an automated BBS would have much more heavy floppy disk usage vs a normal person using a computer directly. Based on whatever is going on with multiple users, people accessing stored messages, a BBS is probably going to wear a disk far beyond the rate of someone who just loads up...
  4. Dale Mahalko

    Old Mac with SCSI? Use "SCSI to Flash" adapter

    I have found an interesting potential solution to transfer data between an old antique Macintosh and a modern Mac or PC... an SD-card to SCSI interface, so you can use modern flash memory as a storage media for your old system. This has a number of potential uses, such as to replace old failing...
  5. Dale Mahalko

    Repairing / Restoring a 1995 Roland XP-50 synthesizer

    While looking for info about other old synthesizers, I came across a video from an electronics repair enthusiast that shows all the work that may be needed to fix an old synth and restore it to full working order. If you're looking for one to play with that may be cheap to buy because it's...
  6. Dale Mahalko

    Recommendation for kids

    Continuing on with this thread, even though you're not replying to any of it... There is a certain amount of benefit you will get from providing such an awesome old but professional tool to a child. It is easy enough for a 6 year old to learn to pick the built-in digitized sounds and drum...
  7. Dale Mahalko

    Antique floppy disks can harm your computer (Youtube)

    All I can say is, I disagree about "always been". I've used Apple II computers on and off since about 1982, and I have never seen this problem before the last few years. I don't ever recall seeing this happen before 2015. But I am slowly going through a pile of old floppies that were previously...
  8. Dale Mahalko

    Recommendation for kids

    Or how about a Yamaha SY85 from 1992 ? This originally cost around $1300 back then, but you can get it for $190 on eBay.. https://www.ebay.com/itm/YAMAHA-SY85-Digital-Synthesizer-Workstation-61-Key-Electronic-Music-Keyboard/133190348055 https://en.wikipedia.org/wiki/Yamaha_SY85...
  9. Dale Mahalko

    Recommendation for kids

    I decided to poke around on eBay a bit, and what do ya know various keywords I mentioned above, turn up hilarious old-tech results. Roland G-800 synthesizer .... $200 https://www.ebay.com/itm/Roland-G-800-ARRANGER-WORKSTATION-64-VOICE-POLYPHONY-w-gator-case/133138447941 Looking for information...
  10. Dale Mahalko

    Pre-emptive multi-tasking / task switching? Add one more IO controller to help this?

    A system designed from the start with banked zero pages, could be set up so the built-in system components use their own dedicated zero page banks, and there is no need to try to cram everything to be as tiny and space-efficient as possible. The Monitor/Kernal ROM reserves all of ZP bank $FF...
  11. Dale Mahalko

    Pre-emptive multi-tasking / task switching? Add one more IO controller to help this?

    I still wonder about some sort of bank mode zero page with subpages. The zero page is "fast RAM" or cache RAM, for a CPU with no concept of cache, so special treatment may be worth the hassle of bank switched pages. I expect there will be a range of softswitches in this system. I don't know...
  12. Dale Mahalko

    Recommendation for kids

    I personally am not much of a real musician, so I don't have any direct recommendations, but here are the general dividing lines between cheap and expensive digital synthesizers. Polyphony - How many keys will make sound when held down at the same time? The cheaper the design, the fewer keys...
  13. Dale Mahalko

    Grundig TV horizontal position screen

    Apparently multiple Grundig controller board chassis are available with different sized CRT tubes and outer cabinets them, so you may not find a service manual for this exact number. There are many numbers on your device, so try looking for combinations of them. For example from this one...
  14. Dale Mahalko

    3D printed, homemade 5.25" floppy drive

    It should be feasible to make a 3D printed hobbyist floppy drive at this point. There are certain parts of a floppy drive that must be high precision, but other parts which can be loose and sloppy. Spend the money only where precision is absolutely needed, and be cheap with the parts that don't...
  15. Dale Mahalko

    Digital signage question....

    I work for a small school district in Wisconsin USA. We use a free signage software called Rise Vision. They have a player software than can run on Windows, Pi, or ChromeBit. https://help.risevision.com/hc/en-us/articles/115001872303-Install-Rise-Player-on-Pi Get a Google account, go to the...