Yes, it is. Thought if you had an older ULA, there is a "hardware patch" to fix a bug with that ula in place on the board. I am not sure if you have to disconnect this or not. I used a later revision ULA for testing purposes on my Issue 2, and had no issues with that, even though I did not remove the "patch".
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(4) The only currently available ULA is type 6C001. When this is used to replace an earlier type the following modifications should be made: change R47 to lkohm. R49 to 10kohm and R56 and R63 to 470ohm.
Yesterday I spent a few hours searching for this information without success.
Today I just googled "ula hardware patch transistor" mentioned by you and third position @ google was what I needed.
Thank you!
BTW: I also placed new ULA 6C001 to Issue 2 without any modifications and it worked. But I am afraid of compatibility issues. So I would prefer to ask rather than make a mistake...
The "dead spider" transistor is still required as this was incorporated into the motherboard of later models.
The ULA book suggests some resistors might have to be changed when using a 6C series ULA instead of a 5 series but has no details.
Comments
Exactly, that is the patch.
I also found some interesting information here:
http://www.worldofspectrum.org/hardware/rep6.html
Issue 2 Modifications
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(...)
(4) The only currently available ULA is type 6C001. When this is used to replace an earlier type the following modifications should be made: change R47 to lkohm. R49 to 10kohm and R56 and R63 to 470ohm.
Yesterday I spent a few hours searching for this information without success.
Today I just googled "ula hardware patch transistor" mentioned by you and third position @ google was what I needed.
Thank you!
BTW: I also placed new ULA 6C001 to Issue 2 without any modifications and it worked. But I am afraid of compatibility issues. So I would prefer to ask rather than make a mistake...
The ULA book suggests some resistors might have to be changed when using a 6C series ULA instead of a 5 series but has no details.