(08-01-2021, 01:15 PM)g67wjjk Wrote: I've dug out my copies of the Technical Manual and Hardware Handbook so I can see those changes referred to earlier - putting in a new crystal, etc.Hi Brett,
One thing I am puzzled by - one of the 'Bees had a speaker glued upside-down (so the cone was facing up) to the speaker grill (it was larger than 50mm cutout), and so the little speaker attachment parts were missing.
Any ideas what I would call them when searching for replacements? I'm getting some new speakers and don't want to glue it in.
Brett.
First up the correct speaker is 50 Ohm not the usual 8 Ohm, I believe they are available from RS Components (not 100% sure on that one).
If an 8 Ohm has been fitted it is highly likely the driver transistor will be fried.
I doubt you will be able to buy the brackets anymore, shouldn't be too difficult to make a couple up, they only need to hold the speaker in place so it dont move.
The 12 Mhz to 13.5Mhz change is changing the divide by six to a divide by four hence the 2 Mhz CPU clock changes to 3.375 Mhz,
however as a result a change needs to be made to the version of Basic and also the Character ROM.
Ernest