Home Page Forums MAME MAME Adding card with loadable ROM

Hi all,

I have a couple of devices I want to implement one for the RM Nimbus, and another for the CoCo / Dragon, that implement a pageable ROM that isn't fixed.
So I want to have the rom loadable from a file at runtime like a floppy disk etc.

Are there any examples of such a device that are known about.

Cheers.

Phill.

The INTELLEC 4 systems have PROM cards. But is it actually a generic PROM card that the user loaded their own PROM in, or is it just a card that has a ROM on it?

There are lots of cards for various systems with bankswitched ROMs, EEPROMs, and Flash ROMs. None of them demand-load from disk - how big are these ROMs?

Some examples:

https://git.redump.net/mame/tree/src/devices/bus/cgenie/expansion/floppy.cpp
https://git.redump.net/mame/tree/src/devices/bus/svi3x8/expander/sv603.cpp

bus/coco/coco_pak includes a ROM with bank switching: coco_pak_banked_device.

In the case of the Nimbus they are I believe up to 256K, and are essentially disk images on ROM.
In the case of the Dragon they could be anywhere in the region of 16K-1024K

Doing the bank switching is not my issue here, I've done that before.

What I absolutely *DONT* want is to have to specify the ROM in the source file. The end user should be able to specify it.
I'll take a look at the examples people have given. It also strikes me that the QL ROM cartridges may also be worth looking at.

Cheers.

Phill.