TRS80 Model 1 Level II

From: Tony Duell <ard_at_p850ug1.demon.co.uk>
Date: Thu Feb 13 16:50:00 2003

> The only downside is you get garbage on screen at powerup, but given the age

Good! If you have the disk controller in the system (read : If you have
the Expansion Interface connected), then the machine tries to boot the
disk _before clearing the screen_. If you don't have a disk in the drive,
then you get a screen of garbage.

Try turning the machine on [1] (or pressing reset -- the button next to
the expansion edge connector on the back) while holding down the BREAK
key. That will force it to ignore the disk controller and go into BASIC
(press ENTER at the MEMORY SIZE? prompt). Or, of course, put a bootable
disk in the drive and press reset

[1] There's a right order to turn things on : Monitor, Expansion
Interface, drives, printer, then put in the bootable disk and turn on the
keyboard/CPU. Do _not_ have a disk in the drive when powering up (or
down) the drive or expansion interface. It will (not may!) become corrupted.

> of the machine I'd take a stab at bad RAM since both my PET 2001 and UK101s
> had that problem and both were fixed by new video RAM.

The M1 doesn't use 2114s :-)

-tony
Received on Thu Feb 13 2003 - 16:50:00 GMT