Recent content by Trianon

Yes, there is very complex design that delays incoming data and possible detects the speed of it (this last is only an idea). No the higher clock only goes to the Macintosh computer side, not the network. It was because of this statement and drawing, it shows the Macintosh computer able to...

Looking at de PAL dump, this line makes perfect sense : /o12 = i4, LED is on when there is some device writing data on the network.

Hi, I did a draft reverse engineering of the schematics based on the photo's and found some interesting things : 1. Of the differential transceiver SN75176 only the receive part is used, the transmitter is continues disabled (pin 3 to GND). This means the data is coming directly out of...

I'm building a small PDS board for my LC with wire wrap for fast debugging a proof of concept. Will be an GPIB controller with a simple u7210 chip, bare minimum address decoder (as done above). 1. Now I'm wondering if there is a difference in writing to the PDS I/O address space between the LC...

Hi Igjk1, Do you still have this card or the manuals please ? I would like to build a GPIB card for the LC and this would be a nice starting place Br, Steve

Hi MindWalker, I'm at the point to build my homebrew version of faster LocalTalk by using an external clock. I'm currently blocked at how to select the external clock, I made as small program but seems some driver is changing it also in the background. How did your machine feel like speed...

I was super happy today when I found an 256MB stick between some old stuff, but when I installed it, there was only 128MB detected. But 128 + 64 + 32 = 204MB should be enough to do some programming ? PS On my machine there is an free FDD power cable hanging lose and I have already the ZIP...

I'm also working on a beige G3 these days and was wondering about this connector : - there are to bays in the top plastic for an FDD, but the Apple floppy cable is only single device ? (on my LC there are 2 of those connectors). - maybe apple was thinking to have a double floppy option and for...

You will also need to add an extra power cable when using the PC style diskdrive ?

And 2 of these, only 32MB with 8 chips on both sides

My beige G3 has this stick of 64 MB, 4 chips on both sides.

Sorry for the confusion, but I'm not sure anymore how to call it now ... On the control panel I set AppleTalk active and then enable AppleShare, is this what you call LocalTalk ? Then I connect all my machine by the DIN 8 printer port. PS 1. I have been reeding the bible “Inside AppleTalk” for...

The clock is one of the differences between syn and async communication, but there is also the max length of one package. Async, most known as RS232 on PC, only supports on single character + optional 9th bit (mostly parity). Sync comm. has a much larger package size, I think on AppleTalk one...

I can only confirm this, I had the same issue with an LC and LC II, recapping worked for the LC II. The LC would still not boot, one of the cap had leaked underneath the keyboard chip, so I desoldered it, cleaned PCB and resolder, done.

Measuring power lines by Ohm will only show when there is a hard short, 1 ohm or below. It's sometimes a good indication sure, but another chip revision, empty/full cap can give a big different. Chips are active parts that need full 5V before they take full current. Better to have a external...