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The easiest way is to use a PC Card adapter for CompactFlash, or a similar (5-in-1 etc.) adapter including SD, in one of the PC Card (PCMCIA) slots of the PB 190. A properly formatted flash card with a valid system folder should even be bootable...

The video card appears to be identical, at least according to the PB 5300 note (originally at developer.apple.com/documentation/Hardware/Developer_Notes/Macintosh_CPUs-PPC_Portable/PowerBook_5300.pdf ). You may have to use archive.org and look for a very early result. The video card in...

Details about signals, monitor sense codes, et cetera at the optional video card could be found in the PB 190 developer note (developer.apple.com/documentation/Hardware/Developer_Notes/Macintosh_CPUs-68K_Portable/PowerBook_190.pdf - an archive search may be needed).

May not necessarily help in this case, but there was an optional video-out upgrade card for the PowerBook 190, intended for the connection of an external monitor. See, for example, pp 60-63 in download.info.apple.com/Apple_Support_Area/Manuals/powerbooks/0306899APWRBK190UG.PDF . One idea could...

A line simulator can sometimes be as simple as a 9 V battery in series with a 330 ohm resistor. A ring signal generator of some kind would be useful if one wants automatic answering at the receiving end (for example, a fax machine). Also, an AirPort Extreme base station A1034 with a built-in...

As has been indicated above, you cannot boot a Macintosh Portable from a CD. You would need, for example, a bootable floppy with CD-ROM software. This could be a copy of an appropriate disk tools floppy, or a Network Access Disk 7.5, with an added CD-ROM extension (compatible with the AppleCD...

Should of course read: LaPorta mentioned the Dead Mac Scrolls by Larry Pina. On page 97 in Pina's book (1992, ISBN 0-940235-25-0),

LaPorta mentioned the Dead Mac Scrolls by Larry Pina. On page 97 in my book (1992, ISBN 0-940235-25-0), replacing an 8048 (40-pin DIP, MPU 8-bit) chip located under the spacebar is said to be the solution for a non-working M0110A (Mac Plus) keyboard if a telephone cable has been used. A...

It depends on the operating system version. For example, System 7.0.1 and 7.1 would have an Apple File Exchange utility on one of the system floppies (Tidbits). Special 7.1 versions and System 7.5 have a PC Exchange control panel.

You could also have a look at Mt. Everything 1.1.1 and its documentation . However, at this point, everything would be experimental, and you run the risk of losing all information.

... and this works with the PowerBook 500 series, too. You can use a standard 3.5 mm stereo miniplug in the Sound output port (that is, the one with a speaker icon, next to the ADB port),

Is this System 7.5 (with a system enabler), or perhaps 7.5.3/7.5.5? Have you tried only classic networking (the MacTCP control panel), or (if applicable) Open Transport (TCP/IP)? With the 7100/80 (and an AAUI to RJ-45 transceiver) wired to one of the LAN ports of your router, it should not be...

According to Larry Pina's book Mac Classic & SE Repair and Upgrade Secrets (ISBN 1-56609-022-9), 1993, page 162, good results are 4.85 to 5.15 (+5 V), 11.9 to 12.80 (+12 V) and -13.00 to -11.30 (-12 V). So, especially the +6.8 V reading is very high. You should try to find the cause for this...

Hello, That does not appear to be possible, since you can start the computer, and something can be seen on the display. Normally, you should be able to read approximately +5 V, +12 V and -12 V via the DB-19 floppy drive port. Have you checked that the multimeter is connected to the correct...

Hi, A certain difference regarding the way the power adapter is recognised and how charging is monitored cannot be ruled out. Cannot imagine any major differences, though. BTW, used the M5159 and M5474 adapters for a quick startup test with a Duo 230 earlier today without a problem. Also had a...

Thank you for the update. It may be wise to be a bit careful about the status of the barrel. When I carried out a very quick resistance check between the barrel and the ring and sleeve for one adapter, the readings were relatively high. One should perhaps not automatically assume that the barrel...

Hello, You may want to have another look at my previous reply. As far as I can find out from information on the Internet, the tip of the pin would be unconnected, the (middle) ring would be ground (or -), and the sleeve (deep inside the barrel) would be + 24 V. The role of the barrel itself is...

The interesting part in this case would be the plug inside the barrel. This is similar to a 3.5 mm stereo headphone plug (it may even be possible to design some kind of DC cable adapter based upon that, modified and insulated in order to prevent short circuits). The tip of the plug does not...

Yes, removing the SCSI hard drive is probably the best way under these circumstances. However, I would not destroy the drive. Instead, keep it. You may find someone with a Macintosh LC II or III (or something similar) where the hard drive could be temporarily installed and erased. A disk tools...