Search results

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...

At least according to the specifications in the user's guide, the DC input for the PowerCD base appears to be 7 to 11 V, 1.2 A. You may find that your power adapter has a DC output of something like 10 V. It is wise to verify the polarity of the plug; probably + centre (positive). If the...

Have you checked the label on the power adapter? According to the user's guide, there were five different adapters. Look for the exact AC input voltage (or voltage range) and frequency. Also, the exact DC output voltage and current (the adapter should provide a DC output voltage, which means...

Not the German version, but the following could perhaps be of some interest to you. https://68kmla.org/bb/index.php?threads/powerbook-150-boot-disk-and-general-questions.45315/page-2#post-525817

Additional information about virtual memory and RAM disk can be found via the System 7.5.3 help system (the question mark in the menu bar). You could enable balloon help (for example, when in the Memory control panel), or use the Macintosh Guide.

No, virtual memory (that is, "virtual RAM") uses the hard disk. It is supported by System 7.5.3. However, virtual memory will be slow. It may be faster if the "hard disk" were a CompactFlash card. A RAM disk makes use of real RAM. Therefore, you would need a sufficient amount of real RAM for...

See also: http://manuals.info.apple.com/Apple_Support_Area/Manuals/powerbooks/0305537APB150TI.PDF (1994) http://manuals.info.apple.com/Apple_Support_Area/Manuals/powerbooks/0307292APB150TI.PDF (1995) If you need a user's guide...

Yes, 8 MB extra would be 12 MB totally, which should be OK. The maximum total is 40 MB. The service manual for the PB 150 contains information about the RAM expansion card and the adapter.

Glad to hear that. Good work! You may need some extra RAM to begin with.