help revive scorpio

08 Mar 02 18:53, bi...@wec.ru -> All:
[skipped]

b> Scorpio ZS256 Turbo+ is broken (I think that’s what it’s called correctly..)
b> The symptoms are: after turning on - a dark screen, reset does not help...
b> The most interesting thing is that if you insert the ROM from ATM-Turbo2, then the computer
b> boots into Basic 48 and works normally. True, with Randomize Usr
b> 15616 TRDOS does not
b> load - vertical stripes appear, as if there are no ROMs at all.

Check the TR-DOS ROM selection node (D49, D50, D67)
and the selection node #1FFD and #7FFD (D46, D47, D44, D45, D66, D68, D69)

b> Tell me at least - when loading, does it test anything on
b> the board? (it may have burned out....:( )

It doesn’t quite “test”. When resetting, it goes to BASIC-128,
to shadow and to TR-DOS.
And if the ROM selection is buggy, we end up in the wrong place
(or even in the void) and hang.

Aleksandr