Date   : Tue, 23 Nov 2010 14:14:44 +1000
From   : devries.bob@... (Bob Devries)
Subject: Harddisc fakery using a microcontroller

Rick,

according to specs here: 
http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en010304

The 18F4620 has 64KB program memory, 3968 bytes RAM and 1024 bytes EEPROM

Regards, Bob Devries
Dalby, QLD, Australia

----- Original Message ----- 
From: "Rick Murray" <rick@...>
To: <bbc-micro@...>
Sent: Tuesday, November 23, 2010 2:00 PM
Subject: Re: [BBC-Micro] Harddisc fakery using a microcontroller


> On 23/11/2010 02:23, J.G.Harston wrote:
>
>> What you want is a hard drive equivalent of this:
>> http://hxc2001.free.fr/floppy_drive_emulator
>
> ;-) I didn't realise at first when partway down the page it suddenly
> switched to French.
>
>
>> What you need is the equivalent that quacks like a SCSI hard drive.
>
> Floppy interface based around an 40Mhz PIC18F4620. I wonder if that has
> enough I/O to talk to an SD card and fake a SCSI bus? Looks like 15 pins
> are used on the floppy I/F, I'll need to dig out my old Morley booklet
> to see what SCSI has.
>
>
>> The above directs all "disk accesses" to data read/writes in image
>> files held in a FAT formatted SD card.
>
> Yup, with LCD and LFN and SDHC... Mmmm, how much memory is onboard that
> little PIC?!
>
>
> [later]
>
> http://ww1.microchip.com/downloads/en/DeviceDoc/39626e.pdf
>
> Good God!
>
> Yeah... I think that'll probably to it.
>
> I gotta get myself into this sort of thing. One of those, bit of
> veroboard...
>
>
> Right. Last question. Is there a "PICS for dummies" book? ;-)
>
>
> Best wishes,
>
> Rick.
>
> -- 
> Rick Murray, eeePC901 & ADSL WiFI'd into it, all ETLAs!
> BBC B: DNFS, 2 x 5.25" floppies, EPROM prog, Acorn TTX
> E01S FileStore, A3000/A5000/RiscPC/various PCs/blahblah...
>
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