STM C070243 Rev F Rom locations.

[PhilC]

Just thought I'd put this here for a quick visual indication of the tos1.04 6 rom locations in case anyone else needs to know.

U2 HI2
U3 HI1
U4 HI0
U5 LO2
U6 LO1
U7 LO0

Or like this

20200813_133931.jpg

[davemacblack]

This is exactly what I did on my 260ST yesterday - upgrade from 6x original ROM TOS 1.0 to 6x 27C256 TOS 1.04 :-). Thanks to the fact that it was a replacement of ROM chips 1: 1, everything went well. I also tried TOS 1.04 on 2x 27C512 in positions Lo0 and Hi0, but it didn't work for me. I also tried to return this machine to prehistoric times BOOTLOAD ROM with 2x 27C64, but also without success. Does anyone know if there is also a solder box on the board that will change the ROM configuration, such as STE W101, W102 and W103 and MSTE W201, W202 and W203?

[exxos]

A lot of this info is on my site https://www.exxosforum.co.uk/atari/last/tos/index.htm