Fixing a PET?

From: Bill Yakowenko <yakowenk_at_cs.unc.edu>
Date: Mon Sep 27 13:10:14 1999

One of the first things to do when you have a screenful of the
wrong characters is to whip out an ASCII chart, and look at the
binary codes for the characters you've got vs. the ones you
expected. Very often the problem is a single-bit change, which
narrows down the source of the problem. For instance, the
difference between upper- and lower-case ASCII characters is a
single bit.

        Cheers,
        Bill.


On Sat, 25 Sep 1999, Gareth Randall <gwr_at_easynet.co.uk> wrote:
] Hi guys,
]
] I'm new here, so be gentle! =;-)
]
] I'm hopefully about to acquire a PET 8032 - the first PET I've ever owned
] (I was six years old when they first came out). I'm told that it boots into
] Basic 4.0, but the boot details are shown in lower case with the odd
] incorrect character. Also, when typing, some characters come up on the
] screen differently to the ones actually typed.
]
] The vendor suggests it may just need a clean and the I/O chip re-seating -
] but if it's something more complicated, is it still possible to buy
] replacement chips? And, thinking longer-term, are replacement screens
] possible to find these days (e.g. are they a standard size that you can
] still buy off-the-shelf)?
]
] Any suggestions gratefully received!
]
] Gareth
Received on Mon Sep 27 1999 - 13:10:14 BST