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Microbee Premium 128k Overdrive boot rom BN57 - Printable Version

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Microbee Premium 128k Overdrive boot rom BN57 - ChickenMan - 22-12-2019

Thanks to ejwords for making this rom image available.  From ECN 8-151287

With the introduction of the 128K OVERDRIVE, a new BOOT ROM was made, to date there have been three versions of this ROM released.

The version number appears on the screen under the Microbee 128K logo.

Known PROBLEMS found and fixed in Ver 2.03.

(1) In self test mode MEMORY BLOCK TEST does not test banks 1 and 3.
(2) Does not test the RAM BANK switching.
(3) The letter 'E' on the keyboard not tested.
(4) Some functions in the MONITOR leave bytes on the stack causing a crash.
(5) The word KERNEL is spelt wrong on the self test Menu.
(6) Problems when typing in glass typewriter mode.

VERSION 2.01 (marked BN 57 and BN 58)
This version has all of the above problems.

VERSION 2.02 (marked BN 59)
This version has problem number 1 fixed.

VERSION 2.03 (marked BN 60) RELEASED Thurs 17th December 1987.
This version has all known bugs fixed.

We already have BN60, BN59 and BN58, so BN57 is presented here just for completeness and not recommended for general use. BN57 does not have the Boot Menu like the others when no disk is in the drive and is only a few bytes different than BN56.

So in the MbeeTech\Microbee\Software\ROMs\Boot folder we placed

bn57.rom