Re: Carte Blanche MMC/SD "disk" update

[srkh28@gmail.com]

.. and a touch screen on that VGA display, like on those tiny 6"
displays in cars, that would make things pretty neat. Touch to select
what ever it is you want to boot.
Lucky Carte Blanche has a PS2 mouse and keyboard interface for the
touch screen.
:)

steve


On Jun 3, 12:02 am, Adam Hall wrote:
> With the VGA stuff already in Carte Blanche, how large of a project do
> you think it would be to instead of sending the Apple video out, you
> could just use whatever your using now and have a program for using the
> VGA out to run a VGA interface to select disk images? That would be
> cool!
>
> On 2009-05-31 00:51:51 -0400, Alex Freed <alex_n...@mirrow.com> said:
>
>
>
> > I did some more work on the subj. A while ago Stephen A. Edwards of
> > Columbia University saw my first Apple on FPGA and wrote his own
> > version. One feature was a fully hardware implemented (read only)
> > "floppy" interface using an MMC card. A complex state machine
> > initialized an MMC card that contained a NIB image of a floppy and read
> > a track into a buffer. The rest was the same as in my FPGApple - the
> > hardware tracked the "head movement" and fed a sequence of nibbles to
> > the CPU. Very cute but not very practical IMHO - only a single NIB
> > image on a huge MMC/SD card.
>
> > This inspired one improvement I made to the CB disk interface. I have
> > added a state machine that initializes the memory card at reset and
> > reads a 512K block from MMC into the internal FPGA memory.
>
> > The interface works like this. Assuming the card in slot 4.
>
> > Write to $C0CC - reset MMC.
> > Write to $C0C4, C0C5 and C0C6 - low, med and high bytes of a block
> > address on the MMC card.
> > Write to $C0C0 starts a read block operation: 512 bytes read into the
> > internal memory that is mapped (after reading from C4xx) to $C800.
>
> > So the whole block is directly available in the 6502 memory space.
> > Probably makes it the fastest disk access in Apple 2 history :)
>
> > There are also addresses for lower level SPI access: set/clear the chip
> > select and write/read a byte via SPI which allows any SPI operation by
> > an Apple program. For example write multiple blocks.
>
> > I may add DMA - read directly into the Apple's main memory if I have
> > time but it's a lower priority task.
>
> > If anyone want to write a UI and needs more hardware features now is a
> > good time to suggest it so it can be included into the default
> > configuration.
>
> > -Alex.- Hide quoted text -
>
> - Show quoted text -