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Good grief, is this not , ahem, cheating?
Brian
Good grief, is this not , ahem, cheating?
Of course it's cheating... How else would Americans get any qualifications FFS !
FSVO "fine". By the time it appeared there were better computers around including the ACT Sirius.
I still have the paper tape with mine on it.
I have the folder containing the paper. Typed on a typewriter (and yes, I paid someone, and no, it didn't cost an arm and a leg).
My wife typed mine, we bought an Imperial 66 for the task. sadly the stencils got lost afterwards.
-- Phil Addison
Another Chuck Peddle design, but it was a few years later IIRC - early
1982...
But you could play tunes on the diskette drives, since they ran at (IIRC) five different speeds.
Five different recording speeds - but only one rotational speed.
On the commodore ones, they favoured GCR encoding for the disks instead of the more common FM or MFM (another Chuck special!). This meant that they could record at different densities across the disk without needing to change the rotation speed. That allowed for more sectors per track on the outer "longer" tracks than the inner ones. Hence how chucks 8250 double density twin drive for the PET series managed 1MB per disk long before IBM achieved it - and their version needed new HD media.
The playing tunes on a drive trick was something most of the commodore drives could do - typically by stepping the heads at variable frequencies. Since the drives were "intelligent" (had their own CPU, ROM, RAM, OS etc, they have very tight low level control without needing any input from the main computer. Hence you could instruct the drive to load a program from disk into its own memory and execute it).
having said that, some folks have done similar with modern drives and dedicated controllers:
My recollection is that the Sirius used different rotational speeds. Wikipedia, at least, seems to agree!
And F1s
This one. And it didn't cost me anything; my Mum typed it.
My mum never learned to type (she was a cashier). My typist was from the Electronics general office, and actually noticed typos of technical terms!
My recollection too.
Incidentally following on from John I know nothing significant about Commodore machines. But I don't see why GCR is necessary to allow varying bit rates.
Andy
Sorry, I was not being clear, my comments were about the commodore ones rather than the Sirrus (don't think I have ever seen one of those in the flesh). I was making the rash assumption (given the designer and the history with the commodore drives), that he used the same trick again. Although thinking about it, it does make some sense they switched to MFM since it was the standard used with MS-DOS...
Mainly I believe that they were not constrained by the limitations of the standard MFM drive controllers used in most systems.
No that can't be right the Sirius 1 had more rotational speeds, nine I think. It came close to a constant bits per inch recording format which is whit it could cram 600k per side on a floppy that IBM could only get to hold 360k
Yup, see my comment to Bob
I 'ad to do mine on t'ferrite core wi' nowt t'keyboard, just a row of t'toggle switches
In reality I was one of those who had to seek out a professional typist and hand over my project, carefully written in my best handwriting, leaving space for drawings, graphs and mathematical/ scientific symbols to be added in later.
When I went back to uni 20-odd years later I was thinking these young kids don't know they're born with Word, Excel and Microsoft Equation editor.
-- Halmyre
-- Halmyre
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