Search found 148 matches

by highwayman
Thu Nov 17, 2011 1:30 pm
Forum: Hardware hacks and extensions
Topic: Cartridge Device for Oric
Replies: 42
Views: 42164

infact thinking about that, these days you can get small wall-bricks - less than half the size of the oric's 600ma(ish) psu that contain a switching psu with a 5v 1.5a output. i'v seen them at junk sales for a € or 2 from routers & stuff. i'm gonna get a few - once i find my real orics i'm gonna rip...
by highwayman
Thu Nov 17, 2011 1:24 pm
Forum: Hardware hacks and extensions
Topic: Cartridge Device for Oric
Replies: 42
Views: 42164

on the cbm/atari machines the cartridge port is very close to the cpu, if you want a backplane like apple, or tangerine etc, you need to buffer the bus and be very careful about track routing. but more importantly, you would want to open the oric & rip that damned 7905 regulator out. replace it with...
by highwayman
Wed Nov 16, 2011 2:14 pm
Forum: Hardware hacks and extensions
Topic: Cartridge Device for Oric
Replies: 42
Views: 42164

mod the rom so cload/csave sends the filename to a new handler. the handler will send the name to the external controller via one or more bytes of ram - probably in the 300 area, then wait for the controller to indicate either "file not found," ready for save" or file found and ready + flags for siz...
by highwayman
Wed Nov 16, 2011 10:07 am
Forum: Hardware hacks and extensions
Topic: Cartridge Device for Oric
Replies: 42
Views: 42164

you dont want to be constantly "banging" stuff in, the ribbon connectors fail after a while if you keep plugging & unplugging them. you need to keep in mond that what you do needs to run on simple software because the oric has limited space for code. i wouldnt touch usb for that reason. infact i thi...
by highwayman
Tue Nov 15, 2011 6:03 pm
Forum: Hardware hacks and extensions
Topic: Cartridge Device for Oric
Replies: 42
Views: 42164

the bus problem is caused by poor smoothing of the 5v supply and the fact that the oric uses a 7905 negative regulator. if the electrolytic caps are good - as in *not* 25+ years old, and your interface does not use an external supply there are no problems - i used to build loads of memory mapped int...
by highwayman
Tue Nov 15, 2011 4:06 pm
Forum: Hardware hacks and extensions
Topic: Cartridge Device for Oric
Replies: 42
Views: 42164

there is no problem interfacing with an 8bit bus, the only time you get problems is if your project is 3.3 or 1.8v such as modern FPGA's because the oric is 5v. however, some FPGA's have 5v compliant i/o and another solution is to use buffers. forget loading tap files - the oric wouldnt know what to...
by highwayman
Tue Nov 15, 2011 10:22 am
Forum: Hardware hacks and extensions
Topic: Cartridge Device for Oric
Replies: 42
Views: 42164

btw, adding ethernet hardware would be pretty easy now - probably only needing 2 chips. 8)

combine that with a nas/fileserver & you end up with a nice solution providing the software doesnt take too much space up.
by highwayman
Tue Nov 15, 2011 10:18 am
Forum: Hardware hacks and extensions
Topic: Cartridge Device for Oric
Replies: 42
Views: 42164

the biggest problem is using ROMDIS to put external code into the upper memory area, i'd be very surprised if you could find a single game that didnt use rom routines, and trying to flip between an external rom and the original on a running system isnt easy without causing a crash. the other option ...
by highwayman
Mon Nov 14, 2011 1:42 pm
Forum: Hardware hacks and extensions
Topic: Cartridge Device for Oric
Replies: 42
Views: 42164

learn about hardware - specially 8bit cpu's & memory addressing.
:twisted:
by highwayman
Sun Nov 13, 2011 5:17 am
Forum: Hardware hacks and extensions
Topic: Idea - Tape Deck Emulator / SD-Card
Replies: 8
Views: 11227

http://www.luigidifraia.com/c64/dc2n/index.html

this was an open project until recently! :cry:
by highwayman
Mon Oct 31, 2011 1:53 am
Forum: General Discussion
Topic: Found many many Ballpoint pens for MCP40 !!!!!!!!!!!!! ;)
Replies: 4
Views: 9559

if you have old ones, *maybe* you can drill them out & put a cut-down pen refil from a bic or something in them! :twisted:
by highwayman
Fri Oct 07, 2011 9:00 pm
Forum: Hardware hacks and extensions
Topic: What is this? A multi-plexer for Telestrat/Oric network?
Replies: 23
Views: 24271

what was the mouse for?
was there any software that used one?
by highwayman
Wed Sep 21, 2011 7:56 pm
Forum: Technical questions
Topic: DATASHEET HCS 3119 AND 3120
Replies: 14
Views: 14833

so, where can i find telestrat schematics and a good pcb foto?
:P
by highwayman
Tue Aug 30, 2011 7:05 pm
Forum: General Discussion
Topic: 16k Oric-1
Replies: 6
Views: 8254

what ram chips does it use?
by highwayman
Sun Aug 21, 2011 6:29 am
Forum: Technical questions
Topic: 1st instruction on boot ?
Replies: 9
Views: 11525

it's not that simple, get yourself a manual for the 6502 cpu. there are 3 vectors, fffa fffc and fffe one is reset - aka the startup address, the others are IRQ & NMI if you arent carefull the interupts will crash your code. the first instruction should be $78 if i remember right, to block interupts...