ZX8-CC8 and 2C158E ULA (PokeMon to the courtesy phone!)

[Moggy]

@Balford.

PM

[balford]

Received the replacement 2C158E ULA from Moggy earlier. Looking forward to having a look at this later

B

[balford]

Luckily I was working from home today so tore into this immediately after finishing up

Got the new ULA in (thanks again, Moggy!) and the CCB wired up:


Attached the scope to the input, immediately things are looking better:


Finally, a quick tune of the CCB, and we have success (including the slight drift to the right of the top pixel line that is characteristic of the 2C158E ULA):


Thanks everyone for your help in keeping this early Zeddy alive and kicking

B

[PokeMon]

(including the slight drift to the right of the top pixel line that is characteristic of the 2C158E ULA):
B

Didn't know that.
Congratulations and when you compare, the signal at pin 16 looks much better now and it is as I thought that the sync driver inside the ULA must be broken. Maybe due to thermal aspects.

[Moggy]

(including the slight drift to the right of the top pixel line that is characteristic of the 2C158E ULA):
B

Didn't know that.
Congratulations and when you compare, the signal at pin 16 looks much better now and it is as I thought that the sync driver inside the ULA must be broken. Maybe due to thermal aspects.

Not only a pixel drift but a slight weaving or "breathing" effect on the whole screen could be observed with some of these very early ULA's as well.

@Balford

Great work sir another one to add to the collection only another 450,000 to go!!

[balford]

Great work sir another one to add to the collection only another 450,000 to go!!

For the love of God don't tell the wife that

Thanks again!

B

[1024MAK]

Another one saved

Mark