ORIC SDCARD

This is the right place to discuss on how to implement hardware vsync, adding a VIA or AY chipset, puting multiple roms, or how to design a new flash expansion card.
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kenneth
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Re: ORIC SDCARD

Post by kenneth »

220 ohm.

Mustangus
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Re: ORIC SDCARD

Post by Mustangus »

Yep

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Dbug
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Re: ORIC SDCARD

Post by Dbug »

I've used a slightly different approach, the "can't miss it!" button :)
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Mustangus
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Re: ORIC SDCARD

Post by Mustangus »

But now it's got a bit of Atmos red in it. :)

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ibisum
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Re: ORIC SDCARD

Post by ibisum »

Nice bit o' red! :)

Mustangus
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Re: ORIC SDCARD

Post by Mustangus »

I have Slightly changed the Erebus case. It now has Colour.
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kenneth
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Re: ORIC SDCARD

Post by kenneth »

the color is very visible and the contours are sharp 8)

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Re: ORIC SDCARD

Post by Mustangus »

Its done with my new toy for the 3d printer. Its a Palette 2s, it can do 4 different colours in one print.

axeman
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Re: ORIC SDCARD

Post by axeman »

This works fantastic on my Oric Atmos and the box colour coding is great. Transforms my use of my Oric.

I'm wondering why I can't get it to work on my Oric-1 with 1.1 ROM as it won't boot with the erebus plugged in. The reset button on the erebus results in a different tone on the speaker when pressed but doesn't reset the machine.

Has anyone got any ideas?

Solved!. Sort of

I had an Idea. I transferred my atmos 1.1 rom to my oric 1 and the erebus works fine on the oric 1 now so its the 1.1 rom I wrote which must be the issue. I used a M27128A eprom. Anyone had any issues with these?

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Chema
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Re: ORIC SDCARD

Post by Chema »

It is due to the EPROM chip. Erebus, as Microdisc, disables the ROM using the Chip Enable pin, which in EPROMs is used to program them, so it does not work.

There is a mod to solve that.

axeman
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Re: ORIC SDCARD

Post by axeman »

Hi,

Erebus is working fine now I've grounded the Chip Enable pin but the Oric wont boot with Erebus disconnected. Is there a way around this?

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Re: ORIC SDCARD

Post by axeman »

I think its this you refer to ?

download/file.php?id=648&mode=view

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Chema
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Re: ORIC SDCARD

Post by Chema »

Probably, I wouldn't know...

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kenneth
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Re: ORIC SDCARD

Post by kenneth »

axeman wrote:
Fri May 08, 2020 6:15 pm
I think its this you refer to ?

download/file.php?id=648&mode=view
The schematic is good. If the IC11 empty socket is used with a 74LS00 chip , LK removed, pin number 12 cut from A13 to be connected to Romdis pin and pin27 of eprom diconnected, the Oric computer will run with a 27c128 memory that could be desactivated with known intefaces.
Ps: The other possibility, remove the eprom chip and put a little pcb on the rom socket, this one will embed the logic chip 74ls00 and the uvprom, to avoid the injuries of the pcb tracks :wink:

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Re: ORIC SDCARD

Post by axeman »

Thanks for your replies. I'd prefer not to cut tracks so I'll develop a piggy back socket mod.

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