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  1. Or write it as an FPGA implementation. Doubtless...

    Or write it as an FPGA implementation. Doubtless it will run faster than the original.

    Stack machines were popular for a time as the target for microcomputer compilers. Interpreted execution. ...
  2. Probably 1600 PE; 6250 was a bit more common...

    Probably 1600 PE; 6250 was a bit more common later. As to data format, that was mostly under program control.

    That's the wonderful thing about tapes--other than (optional on some systems)...
  3. You're expecting newly-manufactured tapes today? ...

    You're expecting newly-manufactured tapes today? Offhand, I'd say that the market is very small.



    You use a tape cleaner/certifier machine. Mine is equipped with a tungsten carbide blade that...
  4. Or put a repeater on the second floor, if...

    Or put a repeater on the second floor, if possible.

    What practical speed is his service? Could be that a simple USB Wifi dongle would work.
  5. Any 900 MHz/100FSB ones?

    Any 900 MHz/100FSB ones?
  6. In fact, a primitive virtual memory scheme was...

    In fact, a primitive virtual memory scheme was implemented by several products under CP/M, but almost always within some sort of framework. For example, JRT Pascal allows for very large programs...
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    I've got the software discs that came with my...

    I've got the software discs that came with my dual 90MB box, if that's any help. Don't know what version they are.
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    Tags like 2D5 or 4C5 are a coordinate system. ...

    Tags like 2D5 or 4C5 are a coordinate system. So 4D3 means page 4, row D, column 3--and then you start looking for a matching tag.

    In your case page 4, coordinate C5 label VSYNC would be the...
  9. Not to put too fine a point on this, but have...

    Not to put too fine a point on this, but have your copies been hacked to defeat copy-protection?
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    Color me dense, but where might I find the...

    Color me dense, but where might I find the schematic for the whole board, not just little snippets?
  11. My experience is with MP/M, which enjoys(?) a...

    My experience is with MP/M, which enjoys(?) a similar banking scheme. However, the hardware that I used allowed mapping the 64K of the address space to anyplace in the 256K of physical memory in 1K...
  12. My null modem jumper boxes all have 6-8-20...

    My null modem jumper boxes all have 6-8-20 connected on the DB25 connectors on both sides. (DCD-DTR-DSR)
  13. Are you certain about the cold re-boot? Do you...

    Are you certain about the cold re-boot? Do you have a program that directly reads the registers of the RTC? There should be a few programs on SIMTEL20 to manipulate and examine the RTC registers. ...
  14. It sounds as if the SRAM is keeping its content,...

    It sounds as if the SRAM is keeping its content, which is to be expected, but could it be that the oscillator isn't running to make the clock "tick"? Does the clock advance between power cycles?
    ...
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    There's a video of Dave (eevblog) trouble...

    There's a video of Dave (eevblog) trouble shooting a PCJr keyboard. It might lend a bit of insight into what goes in to trouble-shooting vintage gear:

    here
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    Me? Even after cataract surgery, I still...

    Me? Even after cataract surgery, I still stumble into walls...:(
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    Also, there's no substitute for good old mental...

    Also, there's no substitute for good old mental work. Make the effort to understand how and why the circuit works and the schematic will become self-explanatory. One word of advice--schematics...
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    Stone--the logo on the controller chip should...

    Stone--the logo on the controller chip should have clued you in.

    It's this one

    http://www.amoretro.de/wp-content/uploads/tseng_labs_et3000ax_optima_1024_3071_rev_a_512kb_isa.jpg

    Switch...
  19. I wonder why the high-power high-heat computer...

    I wonder why the high-power high-heat computer cases don't use centrifugal fans or AC-powered axial fans. Would seem to provide more airflow than a bunch of cheap DC axial fans.

    I recall that...
  20. Hmm, I wonder if someone scrapped a bunch of...

    Hmm, I wonder if someone scrapped a bunch of systems and is now selling them piecemeal.
  21. Yup. Too bad. You could always roll your own...

    Yup. Too bad. You could always roll your own driver as a project. I mean, there must be at least 2 or 3 of these still in existence.... :)
  22. Got a system with ISA slots that runs some flavor...

    Got a system with ISA slots that runs some flavor of Linux? It might be interesting to see if your card is picked up by the SCSI drivers.

    It's a shame, really because the 53C94 was a hot item...
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    Yabut--the problem is that the RTC chip also...

    Yabut--the problem is that the RTC chip also stores configuration data.

    I never understood that. NVRAM/EEPROM chips are inexpensive and will hold configuration data for eons and need no power to...
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    That's the point with the AA alkalines--you can...

    That's the point with the AA alkalines--you can stick them in a bag off the board, so that if they do leak, it's not a big issue.

    I wouldn't try to use a rechargeable lithium coin cell in place of...
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    When it comes to magnetic tapes, the value is in...

    When it comes to magnetic tapes, the value is in the content, not so much in the physical medium. Many millions of reels of 1/2" tape were produced. The pack looks like an IBM 2314 one, but...
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