Search found 313 matches

by Silicebit.
Tue Apr 12, 2022 8:32 am
Forum: Games
Topic: Wolfenstein / DOOM for Oric : has this been done?
Replies: 118
Views: 56286

Re: Wolfenstein / DOOM for Oric : has this been done?

Hey, it looks like a feasible game on Oric! Good work jbperin!
by Silicebit.
Mon Mar 14, 2022 7:54 pm
Forum: Games
Topic: Improved "The Hobbit"
Replies: 52
Views: 15968

Re: Improved "The Hobbit"

I started digging inside the save code, and I've to say that it's like a giant spaghetti mess with variables changed on the stack, JSR that don't return because the return address is popped out and replaced by something else. He he he, welcome to the chaos of The Shire, be careful with trolls. :lol:
by Silicebit.
Sun Mar 13, 2022 12:51 pm
Forum: Technical questions
Topic: Oric Atmos not booting - vertical lines
Replies: 15
Views: 5046

Re: Oric Atmos not booting - vertical lines

Hello John!

Please, check the multiplexers (74LS257).
by Silicebit.
Fri Mar 04, 2022 10:04 pm
Forum: Games
Topic: Improved "The Hobbit"
Replies: 52
Views: 15968

Re: Improved "The Hobbit"

More stuff. Jumps from the main program to the hosted table from $0405 to $0414. 7302 JSR $0405 SyncTape 91EC JSR $0405 SyncTape 7305 JSR $0408 GetTapeByte 730E JSR $0408 " 7317 JSR $0408 " 7328 JSR $0408 " 7345 JSR $0408 " 91EF JSR $0408 " 91F8 JSR $0408 " 9201 JSR $04...
by Silicebit.
Thu Mar 03, 2022 10:02 pm
Forum: Games
Topic: Improved "The Hobbit"
Replies: 52
Views: 15968

Re: Improved "The Hobbit"

Well, "The Hobbit" on tape has a loader, this is the first part to load and loads from $0400 to $0501. Once it runs, it checks whether it is on an Oric-1 or an Atmos. By default, the jump table to the save and load routines points to the Oric-1 ROM, but if the loader detects that it is on ...
by Silicebit.
Wed Mar 02, 2022 10:38 pm
Forum: Games
Topic: Improved "The Hobbit"
Replies: 52
Views: 15968

Re: Improved "The Hobbit"

A few interesting lines of code about The Hobbit. ]; 0400 4C 7C 04 JMP $047C ]; 0403 78 SEI ]; 0404 FC ??? ]; 0405 4C 35 E7 JMP SyncTape ]; 0408 4C C9 E6 JMP GetTapeByte ]; 040B 4C 5A E7 JMP WriteLeader ]; 040E 4C 5E E6 JMP PutTapeByte ]; 0411 4C 6A E7 JMP SetupTape ]; 0414 4C AA F9 JMP ResetVIA ]; ...
by Silicebit.
Wed Mar 02, 2022 8:08 pm
Forum: Games
Topic: Improved "The Hobbit"
Replies: 52
Views: 15968

Re: Improved "The Hobbit"

In a quick glance i seen this for the save command, i hope this help you.

727C JSR $040E
....
....
040E JMP $E65E <---- OUTPUT BYTE TO CASSETTE
by Silicebit.
Wed Mar 02, 2022 6:18 pm
Forum: Games
Topic: Improved "The Hobbit"
Replies: 52
Views: 15968

Re: Improved "The Hobbit"

Wow, great Dbug! One issue, I realized, is that the original game allowed you to save and load the adventure, will have to see if I can somewhat get that working of the floppy. Maybe you should patch save and load routines to work on floppy. A few remarks about this here: https://forum.defence-force...
by Silicebit.
Tue Jun 08, 2021 6:06 pm
Forum: Hardware hacks and extensions
Topic: TEAC FD-55GFR - best 5.25" floppy for retro hacking
Replies: 2
Views: 3050

Re: TEAC FD-55GFR - best 5.25" floppy for retro hacking

I like the TEAC disk drives!




The 5.25" disk drive is a TEAC FD-55BV-34-U, and the 3.5" disk drive is a TEAC FD-235HF. Both works great!
by Silicebit.
Tue May 04, 2021 9:25 pm
Forum: Hardware hacks and extensions
Topic: Oric V23 Modem
Replies: 56
Views: 20331

Re: Oric V23 Modem

Ok, here is the schematic. Oric_serial.jpg This interface is a serial TTL interface, not RS232 compliant. You need a MAX232 IC to translate TTL levels to RS232 bipolar levels and viceversa. Please see TIA/EIA-232-F standard https://cw.fel.cvut.cz/b191/_media/courses/be2m37mam/tasks/mam-busses.pdf An...
by Silicebit.
Tue May 04, 2021 7:34 pm
Forum: Hardware hacks and extensions
Topic: Oric V23 Modem
Replies: 56
Views: 20331

Re: Oric V23 Modem

Hi Mike! I think you don’t have a real RS232 interface. Please, could you take a pic of inside of interface?
by Silicebit.
Sat Jun 20, 2020 6:20 pm
Forum: Hardware hacks and extensions
Topic: Erebus.
Replies: 16
Views: 8740

Re: Erebus.

... As noted in another posting, this sort of thing needs to be done on any other thing on the IO control line though (because a.n.other device may drive the line HIGH, while this one pictured is driving LOW, and you still have a conflict). Correct! For this reason I said in the RetroWiki forum, th...
by Silicebit.
Sat Jun 20, 2020 10:01 am
Forum: Hardware hacks and extensions
Topic: Erebus.
Replies: 16
Views: 8740

Erebus.

@kenneth. A proposal to improve Erebus for future batches :-) . You only need to add a resistor and, of course, modify the PCB.
I/O CONTROL Tristate.
I/O CONTROL Tristate.
Erebusdiagram2.jpg (584.01 KiB) Viewed 6538 times
by Silicebit.
Mon Jun 15, 2020 10:04 pm
Forum: Hardware hacks and extensions
Topic: Omnibus.
Replies: 7
Views: 5485

Re: Omnibus.

Nice project ! It could be interesting to put a diode for each connector on the i/ocontrol pin, that will avoid the level conflict. This will allow the interfaces to exploit its memory area on page 3, if the result is not convincing, we can provide a parallel bridge at each diode. 8) Feasible, but ...
by Silicebit.
Mon Jun 15, 2020 10:02 pm
Forum: Hardware hacks and extensions
Topic: Protek joystick interface diagram ?
Replies: 30
Views: 17262

Re: Protek joystick interface diagram ?

I guess Dbug can be speaking about a thing like the Tandy color computer multi-pak interface. In my mind too. :)

http://www.trailingedge.com/trs80/Coco-Multi-Pakom.pdf