Grundy Newbrain problems

From: Luis Gómez <lgomez_at_cdromsa.es>
Date: Mon Oct 28 21:13:01 2002

A few days ago, i was looking for Grundy Newbrain schematics. Now i have it (if somebody need it, please let me know) -Thanks to Voyager- but i can?t solve the problem:

When i turn on the computer, the 16 character display flicks for 10 seconds. After this i can see the image in TV or monitor screen:

new?brain??????????????????????????????????????????????????????????
????????????????????????????????????????????????????????????????????????
???????????????????????????????????????????????????????????????????????
????????????????????????????????????????????????????????????????????????
????????????????????????????????????????????????????????????????????????
????????????????????????????????????????????????????????????????????????
????????????????????????????????????????????????????????????????????????
????????????????????????????????????????????????????????????????????????
????????????????????????????????????????????????????????????????????????

Uppercase are converted to lowercase
Spaces are converted to ?
Numbers are converter to alphabetical characters (1 to q, 2 to r, 3 to s ....)

but in 16 char. display all information is ok.

It look like add 32 to ASCII code to display, but it is not so, because ASCII(1)+32=ASCII(Q) Q not q

If i move just a little the computer i can see the correct character in screen, but not spaces, it still as ?.

It like there is a bad contact in componet board, but i've check all contact and i can't found the fault.

Sombody know this problem?? There is not the flat cable conecting diferent boards.

Thanks and sorry by my english.

Luis
Received on Mon Oct 28 2002 - 21:13:01 GMT