Search found 27 matches

by cslee_work
Fri Jul 17, 2020 6:34 pm
Forum: Hardware hacks and extensions
Topic: ORIC SDCARD
Replies: 147
Views: 36623

Re: ORIC SDCARD

I found that I could erase a UVPROM with an 18w UVC germicidal tube in less than 1 minute. If anyone needs to.
by cslee_work
Wed Jul 15, 2020 9:03 pm
Forum: Hardware hacks and extensions
Topic: ORIC SDCARD
Replies: 147
Views: 36623

Re: ORIC SDCARD

Whatever happened to the original ORIC SDCARD that uses arduino nano ?
by cslee_work
Sun Jul 12, 2020 8:20 am
Forum: Technical questions
Topic: Need help fixing Oric 1
Replies: 45
Views: 2806

Re: Need help fixing Oric 1

Kenneth,
If I put the 28C256 inside the oric instead of the ORIC ROM, will the Erebus still work, that is the erebus contains no EPROM.
by cslee_work
Sun Jul 12, 2020 8:03 am
Forum: Technical questions
Topic: Need help fixing Oric 1
Replies: 45
Views: 2806

Re: Need help fixing Oric 1

In this case A14 replaces A15 on pin1, this is not a problem for the selection of bank0 and bank3, but the pine27 is problematic with the process, this pin must be disconnected. For the program, Bank0 is the same but Bank3 become the bank1. The content $C000 to $FFFF in the 27c512 chip is placed at...
by cslee_work
Sat Jul 11, 2020 11:16 pm
Forum: Technical questions
Topic: Need help fixing Oric 1
Replies: 45
Views: 2806

Re: Need help fixing Oric 1

Kenneth, can you provide location in ROM to fix it? In the Erebus file the Oric Rom code begins at the same place as the Basic11b Rom file, then you must replace these bytes: Adr $3934: #1E before, #1C after. Adr $39CA: #1A before, #18 after. Kenneth, Can I program it into a AM28C256? Will it work ...
by cslee_work
Fri Jul 10, 2020 7:55 pm
Forum: Technical questions
Topic: Help with two Orics
Replies: 100
Views: 10445

Re: Help with two Orics

In my debug, A1 was flatlining. After removing one of the address mux chip, A1 started toggling.
So after replacing the address mux, my Oric booted up.
by cslee_work
Sun Jul 05, 2020 2:32 am
Forum: Technical questions
Topic: Need help fixing Oric 1
Replies: 45
Views: 2806

Re: Need help fixing Oric 1

Thank you Kenneth.
by cslee_work
Sat Jul 04, 2020 7:05 pm
Forum: Technical questions
Topic: Need help fixing Oric 1
Replies: 45
Views: 2806

Re: Need help fixing Oric 1

I guess that will work if I can't restore it to stock
by cslee_work
Sat Jul 04, 2020 12:48 am
Forum: Technical questions
Topic: Need help fixing Oric 1
Replies: 45
Views: 2806

Re: Need help fixing Oric 1

Ok. That's clear now. All the tests passed. I had to change 6502. Somehow the NMI pin is always low. With a new 6502 all tests passed. Thanks everyone for the help. Now if I can find a replacement NMI button, my ORIC is good as new. Hope I can do the 60Hz fix for the Erebus ROM. That's for another d...
by cslee_work
Fri Jul 03, 2020 7:23 am
Forum: Technical questions
Topic: Need help fixing Oric 1
Replies: 45
Views: 2806

Re: Need help fixing Oric 1

So the debug ROM runs but it FAILS the CASS O/Rly/Spkr. The test does not progress anymore from there. Is it hung ?

I can hear a pulsing tone with the loopback connector.
by cslee_work
Fri Jul 03, 2020 4:11 am
Forum: Technical questions
Topic: Need help fixing Oric 1
Replies: 45
Views: 2806

Re: Need help fixing Oric 1

Ignorr that last question. It was a hardware failure. The clock mod failed. So no clock to ULA.
by cslee_work
Fri Jul 03, 2020 1:18 am
Forum: Technical questions
Topic: Need help fixing Oric 1
Replies: 45
Views: 2806

Re: Need help fixing Oric 1

Question for mikeb or anyone. I burned the 60Hz debug rom and booted.with it. It says RAM PASSED. I see it asks me to press NMI to proceed. I quess it's the reset button at the bottom. Pressing it does nothing however.

The screen stays rock solid. So that's good
by cslee_work
Thu Jul 02, 2020 11:32 pm
Forum: Technical questions
Topic: Need help fixing Oric 1
Replies: 45
Views: 2806

Re: Need help fixing Oric 1

kenneth wrote:
Thu Jul 02, 2020 10:14 pm
About the Erebus device, the Atmos Rom which is in the chip 27c512 is the same, only the Cload routine is modified.
Is the chip socketed?
by cslee_work
Thu Jul 02, 2020 7:16 pm
Forum: Technical questions
Topic: Need help fixing Oric 1
Replies: 45
Views: 2806

Re: Need help fixing Oric 1

Thanks for everyone's help. I'll try the 60Hz ROMS and report back. I hope I can hack the Erebus ROM too when I get it. As for the adapter, I will try the hack to put an ESP8266 to enable the extra settings menu. ( https://tomdalby.com/other/gbs8200.html ) On a slight off tangent, where can I get a ...
by cslee_work
Thu Jul 02, 2020 9:02 am
Forum: Technical questions
Topic: Need help fixing Oric 1
Replies: 45
Views: 2806

Re: Need help fixing Oric 1

iss, you are a genius. That worked. However, when I got HIRES it goes blank again. I poked the same #BFDF in HIRES and I brought back the screen in HIRES but the text is not visible in the bottom of the screen. Going back to TEXT, needed the poke again. I suspect I can hack the ROM for NTSC. There m...