[Coco] Superboard discussion: Serial EEPROM
Boisy G. Pitre
boisy at boisypitre.com
Sat May 1 22:51:37 EDT 2004
On May 1, 2004, at 12:51 AM, Bob wrote:
> Okay, I haven't added much to it, but just wanted to put this initial
> map out
> there to get some feedback.
> [8 bytes - VROM 1 label]
> [8 bytes - VROM 2 label]
> [8 bytes - VROM 3 label]
> [8 bytes - VROM 4 label]
> [8 bytes - VROM 5 label]
> [8 bytes - VROM 6 label]
> [8 bytes - VROM 7 label]
> [8 bytes - VROM 8 label]
> [1 byte - VROM default select]
> [1 byte - startup preferences stjjccmm]
> bit 7 s = speed 0=low 1=hi
> bit 6 t = hires type 0=Tandy 1=CoCoMax3*
> bits 4-5 jj = joystk pref 0=ask 1=L 2=R 3=hires*
> bits 2-3 dd = column pref 0=32 1=40 2=80
> bits 0-1 mm = monitor 0=ask 1=cmp 2=rgb (3=mono?)
Looks good so far, however, can you explain how the 'ask' feature of
the joystick and monitor preferences will work? Is this really needed?
> [190 bytes free in RSDOS section]
> [256 bytes reserved for NitrOS9]
> * hires joystick driver up to user/software.
> --- "Boisy G. Pitre" <boisy at boisypitre.com> wrote:
>> On Apr 24, 2004, at 1:36 AM, Bob wrote:
>>> I'd like to know if there are any "standards" in mind for this:
>>> "Serial EEPROM: 512 bytes of serial EEPROM..."
>> There is a preliminary break-down of the storage contents of the
>> EEPROM in the SuperBoard. I had a preliminary sketch of how this
>> look in my mind... essentially the first 256 bytes are devoted to Disk
>> BASIC and the second 256 bytes are devoted to NitrOS-9.
>> Some of the information in the first 256 bytes is taken up by the VROM
>> feature of the SuperBoard. Specifically, there are eight 8 byte label
>> areas for a total of 64 bytes. These are used to label the 8 banks of
>> VROM. Another byte holds the default VROM to startup in. Yet another
>> byte holds bits about the state of startup (hi speed mode, etc.).
>> The plan is to keep some of the space open for "user-defined" use.
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