Hi all,
I'm having trouble with new MK2 board. As subject says, all I get is black screen. Power LED is solid, board LED is blinking without SID (and is off when there's SID)
I've removed both CIA chips and SID as well. I have tried three different CPUs (2x6510 and 8500) and four different VICs (2x6569R5, 6569R1 and 6569R3). I also tried cleaning the pins on both chips, but no luck.
Querying chip info yields following result:
VIC-II: 6569 (BB 5B AF55 PAL)
SID 1 : Unknown (11 00)
SID 2 : Unknown (03 00)
CPU : PHI2 OK (045E)
READY (press key for menu)
I suspect it's something related to CPU/RAM (or maybe ROMs), since I inspected memory where the default screen is located ($0400-$07FF) and I don't see patter one would expect to see when system had booted normally. I inspected content of the ROMs and they seem fine (at least few first and few last bytes of both KERNAL and BASIC ROMs)
This is the pattern I get in screen memory (I'd expect to see a lot of 0x20 and familiar text for C64 start screen in hex):
Read memory
Enter start address in hexadecimal (Type 'X' to abort)?400
Enter last address in hexadecimal (Type 'X' to abort)?7FF
6A 85 6A A9 69 A0 00 20 FF FF FF FF FF FF FF FF
FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
5B BC AA 4C 61 B0 A9 00 FF FF FF FF FF FF FF FF
FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
85 0D C6 4D 20 A6 B6 85 FF FF FF FF FF FF FF FF
So do you have any more suggestions?
Thanks!
Regards,
Mladen