forum.defence-force.org

make what wireless, the whole bus? :D but seriously, you cant link the oric to something that has an independant psu without isolating it. so usb for example is questionable. btw, with modern mcu's the oric could have usb(1.1) or ethernet real easy. but i'm not sure how big the software would be - i...

missed a few of your questions, 32k sram is history - the microcontroller has more than that. and an absolute shitload of flash too - 128k in the one i'm looking at. no buss issues should happen, the iric is 1Mhz, the micro is 20Mhz - it can slave the buss and wait for the clocks. and as it can run ...

well i had not thought of keeping the bootrom on the sd-card - interesting idea. the way the load/save works is basicaly that you request a file by name & it's returned in serial format. very similar to tape - probably because it was started on the pet/vic20 the sd2iec uses virtual folders/disks...

when i say map the card into the romspace, i'm not talking about a large area, i just meant overlaying a couple of bytes - say data & status/command to an address that is normally used by the rom so it wont collide with anything else. for example, using $c000/c001 that said, maybe - just maybe, ...

i didnt know there was a Nuclear power plant simulator!!!!!
only the French would do that!
well - back then they would anyway!

if you really want to do this, use the bus-port. map a new rom over the old one, with the tape routines removed & replaced with the sd ones. and you can map the sd card over one of the bytes in the rom-space. a simple gal device can do the address mapping for the sd/rom. it would cost beer-money...

i learned using just the memory map & opcode info in the back of the oric-1 manual!!!!!

i think the amscrap drives work,
but check the belt.

i saw a couple of years back on an amscrap forum that if you leave the drive unused for years the drive-belt stretches & goes into an oval shape that wont spin cleanly.

they where locating new belts btw.

if your going to use a pc,
just scan and OCR the listing!

nintendo did this in japan with cartridges containing battery-backed ram instead of a rom,
i think they could be re-used.

you paid for the cartridge, then you plugged it in and paid for the chosen game.

scope the pins on the cpu.
check the clock, rst, irq and address & data pins in that order.

the crap you see before the prompt is just random data in ram.

what's wrong with the last one?

did you fix them yet?

easy, just map it to the adreess you want and use /ROMDIS to disable the internal rom. better yet, use a ferro-ram or battery-backed ram, set it so the romdis signal and the /OE signal on the ram can be fliped on & off. then you can power your oric & do something like. for a = $c000 to $ffff...

just to add a bit of tech info. the oric psu is a linear type (transformer) on 50hz mains, it's output is fullwave rectified - giving you a chopped-up 100hz dc output. then it's smoothed by a cheap rubish cap. SO THAT'S YOUR 100hz SOURCE. 8) once in the oric, it goes through a 7905 regulator and ano...