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Re: 505 board converting to serial output
Posted: Wed Mar 27, 2024 10:13 am
by bxdanny
Those BRK messages make it look like there may be nothing but 00 bytes in the part of the ROM where the boot code should be! Can you please dump the contents of $FF00 through $FF9F? (Enter PFF00 in the Monitor and send/post the first 20 lines that are displayed.) I'm sure the image file I sent you had that code intact. But now that you have a good drive connected, you could also try that file I sent that runs boot code in RAM again.
Re: 505 board converting to serial output
Posted: Wed Mar 27, 2024 10:49 am
by nama
PFF00
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
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 FE AA 20 90 FF 85 FD
20 90 FF 85 FF A0 00 20
90 FF 91 FD C8 D0 F8 E6
FE C6 FF D0 F2 86 FE A9
FF 8D 02 C0 60 A0 F8 88
D0 FD 55 BF CA D0 F6 60
AD 10 C0 4A 90 FA AD 11
C0 60 48 2F 44 2F 4D 3F
D8 A2 D8 A9 D0 85 FE A0
00 84 FD A9 20 91 FD C8
D0 FB E6 FE E4 FE D0 F5
A9 03 8D 00 FC A9 B1 8D
00 FC B9 9A FF 30 0E 99
C6 D0 AE 01 FE D0 03 20
0B FE C8 D0 ED AD 01 FE
D0 05 20 00 FE B0 03 20
ED FE C9 48 F0 0A C9 44
D0 0C 20 00 FF 4C 00 22
4C 00 FD 20 00 FF 6C FC
FE EA 30 01 A0 FF C0 01
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
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
Just pulled the EPROM and am checking it now...
Re: 505 board converting to serial output
Posted: Wed Mar 27, 2024 10:59 am
by nama
Looks like you have made a breakthrough!
It's midnight here in NZ. Will be back on the case tomorrow.
Much thanks!
Re: 505 board converting to serial output
Posted: Wed Mar 27, 2024 11:21 am
by nama
Ok...it's well past midnight now, but I couldn't stop myself...I burnt a new EPROM, and installed. I HAVE DISK ACCESS!!!!!
Look at this! Happy happy!!!
This is with the gotek installed too.
Sleep now, test more tomorrow.
THANKS GUYS!!!!!!
- disk access.jpg (272.72 KiB) Viewed 1817 times
Re: 505 board converting to serial output
Posted: Wed Mar 27, 2024 9:13 pm
by nama
Well, it wasn't a dream, woke up this morning and it still works!
So something must have happened to this EPROM between the time of programming it, getting the serial working, and trying to get the floppy working. Basically it would not have pass the programming check if it had been programming bad...so maybe its just lost bits after programming.
Anyway, so now I'm onto the final steps...building one of Dave's Unified keyboards, and sorting out why the video signal out of my newly built 540 board is so bad...so I may be back here soon.
Anyway, just wanted to thank Mark and Danny for their continued support not only for me and my projects, but also to the community at large.
Cheers!