Thread
Plus Too: a DIY Mac clone project (128k -> Plus)
The first time in over 20 years. A new Macintosh Plus has been born! (Well, I suppose that was really on the 4th when you first got the Happy Mac to work. But eh.)
Congrats on your lasted achievement!
Do you know why it locked up after five minutes?
Congrats on your lasted achievement!
Do you know why it locked up after five minutes?
Outstanding! Preorders? 
I'm completely lost for words...that is just....awesome. :O
Fabulous!!!! :approve:
< hoists a long neck root beer in salute to BMOW's incredible progress and latest milestone achievenent! >
< burrrrrrrrp!!!!! :I >
< hoists a long neck root beer in salute to BMOW's incredible progress and latest milestone achievenent! >
< burrrrrrrrp!!!!! :I >
I think the freeze-up is something related to the mouse interrupts. It seems to happen if I move the mouse around in fast circles, but I haven't had a chance to look into it further than that yet. Ack, so much more to do!
Oooo! Awesome! I can't wait for the next update.
Have you thought about adding a ROM SIMM slot?
What is the effective speed of the system? Is it clocked at 8MHz, or does it run at a faster speed?
Have you thought about adding a ROM SIMM slot?
What is the effective speed of the system? Is it clocked at 8MHz, or does it run at a faster speed?
It runs at 8.125 MHz, which was chosen because it's 1/8th of the 65 MHz pixel clock necessary for 1024 x 768 @ 60 Hz VGA video. The real Plus runs at 7.83 MHz, so everything is a little bit too fast.
One strange thing is that loading data from the virtual "floppy disk" is unexpectedly slow. I haven't timed it, but it seems slower than even a real Mac Plus, which is odd because there are no delays here for track-to-track head movements. Or maybe it's the general execution speed of the computer in general that feels slow, I can't be sure. When it's working better, I'll run Speedometer or something on it.
One strange thing is that loading data from the virtual "floppy disk" is unexpectedly slow. I haven't timed it, but it seems slower than even a real Mac Plus, which is odd because there are no delays here for track-to-track head movements. Or maybe it's the general execution speed of the computer in general that feels slow, I can't be sure. When it's working better, I'll run Speedometer or something on it.
Would it be possible in the future to run it at the full 65MHz? That sure would be cool.
Especially cool when trying to play a version of Tetris at 8x normal speed! :lol:
Were games "relatively" CPU Clock Corrected by the time the Plus and its OS levels were released? :?:
Were games "relatively" CPU Clock Corrected by the time the Plus and its OS levels were released? :?:
I can't imagine why they would be. So far as I'm aware the Plus runs at exactly the same speed as the 128k/512k.
(The SE ran at the same clock speed but changed the video timing to free up more RAM bandwidth, so it's slightly faster. But it didn't debut for another year-and-change.)