Recent content by mdog69

I've recently had cause to image an IDE disc on a telecoms tester running Windows 95- no USB ports, only boots from A or C. Nowhere to connect a CD-ROM. No onboard LAN (never mind the ability to boot from LAN). Did have a 3.5" 1.44Mb floppy and two PCMCIA slots though. Got the thing imaged by...

IIRC with SunOS 4.1.3, if you softlinked blah to rsh then running "blah" would behave as if you typed "rsh blah"...

Have a look at page 15 of this PDF, subheading "Hawk Attack" https://worldradiohistory.com/UK/Practical-Computing/80s/Practical-Computing-1984-07-S-OCR.pdf £1500 back in the day...

Toying with getting one of these. Does that screen have three connections - DC power, "reverse" (output flipped L/R) and "AV" ("straight" input)? I assume the monitor will normally use the "AV" input and only switches to the "reverse" input when it detects a signal (which is provided by a...

The sentinel dongle was used for lots of products. The only external clue is what's on that sticker, and even then you'd be lucky if the OEM put their name on the sticker, never mind which product it related to. Back in the day, virtually every dongle I saw had someone write the application name...

Turning parallel/centronics data into a serial data stream can be done without any coding using the transmit side of a 6402 or AY-3-1015 UART and (if required) a suitable TTL/RS-232 level shifter. Flow control is easily achieved by tying the appropriate serial handshake line to the appropriate...

ISTR that the boot ROM does the normal basic hardware start up, and then launches the forth interpreter, which runs commands to set things up (including scanning other s-bus cards for setup code) and then finally ends up running the boot command, if boot is enabled, or dropping to the ok prompt...

This page seems to indicate that the Backpack hardware will support a CDROM or a hard drive, as they both use the same protocol. https://docs.kernel.org/admin-guide/blockdev/paride.html If I was experimenting, I'd use a linux box with a parallel port running an older kernel (on an internsl...

Because installing a MDA/HGC plus CGA addresses the problem of "Two graphics cards at the same time in an XT" for which CGA+VGA isn't a workable solution.

You might find that the a replacement 48T02 nvram in that box might not work, as Sun boxes depended on an undocumented feature which was only present in older devices. The fix is to go down the Dremel route rather than replacement route. (Hint: if you damage the 32.768kHz crystal - just solder...

Probably doesn't have a NIC onboard Get a 3C589B PCMCIA card+"dongle", appropriate card services drivers for DOS and/or Win3.11 and a driver for the NIC. The 589 is the PCMCIA version of the 3C509. If you are really lucky you might get one with the "combo" dongle - 10Base2 and 10BaseT in the...

There may be a more recent version of ZIP (222) at https://www.sac.sk/files.php?d=3&l=Z

Device id isn't likely to work on anything earlier than late issue 2764 devices. From memory reading the id involves feeding "out of range" voltages to the A9 line amongst other things. "Out of range" meaning something outside the normal 0 to +5V. A device datasheet will give you the details.

On my linux boxes I use fdupes to look for duplicate files.

Many 220V switched mode power supplies are actually capable of doing 110V. Have a look at The 110/220V switch is a single pole switch which connects one of the bridge rectifier terminals (usually the neutral) to the mid point of two capacitors on the DC side of the rectifier. This turns the...