Skip to main content
Search titles, bodies, and author names
Found 14,295 posts across 1 forum.

Why the unusual frequency? — #9

Interesting project MarkS. By coincidence, I've been reading the following similar projects in the last 24hrs: Prop-6502 laptop pPropQL020 and pPropQL I think the "16MHz" quote…
68kMLA Hardware by Bunsen Tue, 3 Nov 2009 - 14:07

1920x1080 on PM8500 built-in, Twin Turbo 128 — #1

I have been able to hack the built-in video driver of my PowerMac 8500 to support 1920x1080 and 1680x1050 LCD panels perfectly (been using 1920x1080 for over a month now with zero …
68kMLA Hardware by noidentity Tue, 3 Nov 2009 - 11:17

Mac Classic corpse — #1

The machine (240 V Classic - not II) has not been switched on for about 4 years and appears dead. I have opened up and can see the voltage on the inside of the mains switch but I …
68kMLA Hardware by cranerobinson Tue, 3 Nov 2009 - 10:25

Why the unusual frequency? — #8

The Apple II uses a 14.31818MHz crystal (4x color burst) which gives it the ability to generate pseudo-color video on a TV. Click to expand... And so did the original IBM PC, i…
68kMLA Hardware by porter Tue, 3 Nov 2009 - 07:36

Why the unusual frequency? — #7

Everything in a Plus runs off a single crystal which was chosen for compatibility with the SCC chip and standard baud rates. If you change the crystal, the Mac may beep and start, …
68kMLA Hardware by H3NRY Tue, 3 Nov 2009 - 07:28

Why the unusual frequency? — #6

15.6+- khz is the time it takes to produce a single line on a NTSC tv, so the apple screen is probably really running at or near ntsc tv specs Also it was very common in the 80's t…
68kMLA Hardware by tomlee59 Tue, 3 Nov 2009 - 05:51

Why the unusual frequency? — #5

What was the reason behind the odd clock speed? Click to expand... It divides evenly (ie by integer) to generate baud rates. But I imagine the pixel clock was an important reas…
68kMLA Hardware by porter Mon, 2 Nov 2009 - 21:48

Why the unusual frequency? — #4

15.6+- khz is the time it takes to produce a single line on a NTSC tv, so the apple screen is probably really running at or near ntsc tv specs Also it was very common in the 80's …
68kMLA Hardware by Osgeld Mon, 2 Nov 2009 - 21:48

Why the unusual frequency? — #3

Everything derives from the same clock. The frequency from the oscillator is divided in half for the processor and further for other IC's. The full clock speed is fed to the video …
68kMLA Hardware by MarkS Mon, 2 Nov 2009 - 21:31

Why the unusual frequency? — #2

If I were to swap out the oscillator, would it potentially damage the Mac? I doubt the .1664 MHz jump would hurt anything, but I want to make sure first. Click to expand... Ser…
68kMLA Hardware by porter Mon, 2 Nov 2009 - 21:25

Why the unusual frequency? — #1

I am working on a project with my Plus. The analog board is dead and while I do plan to fix it, I want to play around with a microcontroller. Anyway, One thing I'll need the microc…
68kMLA Hardware by MarkS Mon, 2 Nov 2009 - 21:18

Mac Plus and External SCSI — #14

The Mac II onwards were designed to use NuBus bus mastering for high speed data transfers. Both devices had to be on the NuBus, of course, and support bus mastering, at least as a …
68kMLA Peripherals by porter Mon, 2 Nov 2009 - 20:29

not mac, but still my oldest computer — #2

Awesome! i loved those things. I used to have one. Try to find the floppy drive (and accompanying disk) that gives you 100KB floppy storage on a modern floppy. The floppy also ru…
68kMLA Peripherals by coius Mon, 2 Nov 2009 - 20:00

G3 beige desktop strangeness — #10

Well, the thing went BANG, and my house RCD tripped (at least it tested that...), a nice smell of burning electrics coming from the power supply followed... Click to expand... …
68kMLA Hardware by Charlieman Mon, 2 Nov 2009 - 19:43

CC? Si, si! — #3

Depends what condition it's in when it arrives. This will be my third CC. I would like to keep one stock, or stock-ish (ie a LC550/CCII motherboard swap, at most), and reserve th…
68kMLA Hardware by Bunsen Mon, 2 Nov 2009 - 19:33

Mac Plus and External SCSI — #13

As far as I know, the first Mac to actually have DMA (which the very first IBM PC had) was the IIfx and it was only used under A/UX. Click to expand... The Mac II onwards were …
68kMLA Peripherals by Charlieman Mon, 2 Nov 2009 - 19:32

Mac Plus and External SCSI — #12

1) External drive must supply termination power (the power supply in the Plus is too feeble to do the job, so the design team decided that the external box should supply term power…
68kMLA Peripherals by Charlieman Mon, 2 Nov 2009 - 19:15

G3 beige desktop strangeness — #9

Too much paste is worse then none at all, even a little that gets stuck on the cache leads will short out a chip. Click to expand... yea if your using lead paste, ive never see…
68kMLA Hardware by Osgeld Mon, 2 Nov 2009 - 17:51

not mac, but still my oldest computer — #1

about a year ago i purchased a trs-80 model 100 at a garage sale for $3. at that time i thought that it did not work. today i took it out, plugged it in, adjusted the screen resolu…
68kMLA Peripherals by geeko Mon, 2 Nov 2009 - 17:05

CC? Si, si! — #2

Nice. Are you planning to resurrect it or use it for some mod?
68kMLA Hardware by protocol7 Mon, 2 Nov 2009 - 17:00

G3 beige desktop strangeness — #8

Well, the thing went BANG, and my house RCD tripped (at least it tested that...), a nice smell of burning electrics coming from the power supply followed... This thing is toast, b…
68kMLA Hardware by billynomates Mon, 2 Nov 2009 - 16:40

CC? Si, si! — #1

http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&item=110449049167 Just waiting for the postage quote (should be around $20)
68kMLA Hardware by Bunsen Mon, 2 Nov 2009 - 15:37

Powerbook G3 3500/"Kanga" — #11

Report back on how your XPostFacto install of 10.2 goes! I've been really interested in getting a Kanga to turn into an OS X machine, but haven't known anything about how easy it w…
68kMLA Hardware by hilga007 Mon, 2 Nov 2009 - 06:24
mp.ls