Possible char rom failure ?

[mrr19121970]

Would this be a typical char rom failure ?

[eslapion]

looks like it

[mrr19121970]

I will try desoldering later. The IC seems to be very hard to come by, and might not be economically viable?

NOS 25 euro
Replacement 21 euro

anyone have a more economical source?

Update. Desoldered and put in working machine. Same issue. Confirmed char rom. Inserted working one and all good

[srowe]

anyone have a more economical source?

Not used them, but this Italian seller on eBay has modern replacements

http://www.ebay.co.uk/sch/8bit_fan/m.ht ... 1543.l2654

[mrr19121970]

Thanks, it's the same seller. I am chatting with him now.

[srowe]

You can also build your own adapter board and program a 2732 EPROM using these

http://store.go4retro.com/23xx-adapter/

[eslapion]

You can also build your own adapter board and program a 2732 EPROM using these

http://store.go4retro.com/23xx-adapter/

WRONG!

The 2732 is 24pins and is not compatible with this type of adapter. This adapter is for 2764 up to 27512 types of EPROMs.

I have a spare character generator ROM for the VIC-20, asking 9 Euros. Cheaper hum?

[mrr19121970]

I will take it

Update. Payment sent.

[mrr19121970]

Many thanks @eslapion. Dropped in. Works. Can it be that ntsc vic20s have better image than pal ??

[eslapion]

Can it be that ntsc vic20s have better image than pal ??

IMHO, yes. The color encoding in PAL can sometimes cause weird degradation of image quality when some color combinations are used.