The diskette that blew Trixter’s mind

This is pretty obscure, and super old sk00l, but I am completely fascinated. This guy found a disk that was readable by both C64 and IBM PC – quite a rare find indeed…

This diskette has officially blown my mind.

This is the very first time I have ever seen something like this.  The data for the IBM program takes up more than 160KB as evidenced by a DIR.  The C64 1541 drive is a single-sided drive; IBM’s is double-sided. Based on all this, we can deduce how this diskette is structured and why:

– The IBM version of the game required more than 160KB (ie. needed more than one side of a disk), probably because it has a set of files for CGA/Herc (4/2 colors) and another for EGA/Tandy (16 colors) and either set will fit in 160K but both won’t
– The C64 version required around 80K, based on the fact that every other track is unreadable by an IBM drive
– The publisher had the requirement of using only a single disk to save on packaging and media costs
– Not wanting to limit the game to either CGA or EGA, someone at Artech (the developer) built the format of this diskette BY HAND so that DOS would not step on the C64 tracks, and somehow the C64 would also read/boot the disk

I don’t know how the C64 portion boots since track 0 sector 0 looks like a DOS boot sector, but quick research shows that C64 disks keep their index on track 18.  If anyone knows how C64 disks are read and boot, I’d love to know.

The diskette that blew Trixter’s mind « Oldskooler Ramblings.

Canon 5200mm f/14 lens

…really looks like a cannon. 😉


This is the most mammoth camera lens I’ve ever seen, and has almost unbelievable specifications:



  • Focal Length: 5150mm
  • Exposure Control: Light quantity is controlled with the use of built-in ND filters, corresponding to f/14, f/16, f/22, f/32
  • Minimum Object Distance: 120 meters (Approx 393 feet!)
  • Size: 500mm(wide) x 600mm(high) x 1890mm(deep) [20”x24”x75.6”]
  • Weight: 100kg (220 lbs) without stand.

Yes, this behemoth is 220 pounds! That fact alone is impressive enough, then add the fact that it is capable of taking photographs of objects 18 to 32 miles away!

And now, this bad boy is for sale on eBay, for the low, low price of $55,000.00.

I think the best part is the quote from the seller:

This is a very rare Canon 5200mm photographic lens – possibly one of only three ever built. THE largest & most powerful prime lens ever created for dedicated SLR use. Built in Japan it was purchased by a Chinese company & shipped to China where it has since had little use & is now for sale. The optics appear in perfect condition. It is my understanding that a customized SLR/DSLR/EF mount can be created/included by the team of optical engineers who presently look after the lens. Due to its large size, it may be better suited to astronomy applications. It takes two people to lift the lens. It could also be mounted on a customized truck or SUV. A large geared or motorized support head would be needed to get the most out it. The magnification of this lens is truly staggering. If mounted to a Canon XL series video camera for example, a reach of 1000x optical (at least) would be possible (approx 37,500mm). The lens could also be mounted to HD & cine cameras. Tracking the space shuttle would not be a problem. Perhaps it’s already been used for that purpose? – (Did I just say that??!) Manual focus of course. Yes rear drop-in filters can be used. With so few ever built Canon spent “squillions” on the R&D, not to mention the manufacturer of this lens. Original cost price?? – don’t even ask!! 😉 In all seriousness I can’t be accurate. The Canon factory picture shows the lens mounted to an SLR camera (circled in red) – this will further give you an idea of it’s size.

For a better idea of how powerful this lens is, take a look at the following example:


Thanks to the following sites for information on this magnificent lens!