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- Apple II
- Technical Notes
- _____________________________________________________________________________
- Developer Technical Support
-
-
- ProDOS 8
- #8: Dealing with /RAM
-
- Revised by: Matt Deatherage November 1988
- Written by: Kerry Laidlaw October 1984
-
- This Technical Note formerly described conventions for dealing with the built-
- in ProDOS 8 RAM disk, /RAM.
- _____________________________________________________________________________
-
- Section 5.2.2 of the ProDOS 8 Technical Reference Manual now documents the
- conventions on how to handle /RAM, including how to disconnect it, how to
- reconnect it, and precautions you should follow if doing either, which were
- covered in this Note. The manual also includes sample source code.
-
- Executing the sample code which comes with the manual to disconnect /RAM has
- the undesired effect of decreasing the maximum number of volumes on-line when
- used with versions of ProDOSĀ 8 prior to 1.2. This side effect is because
- earlier versions of ProDOS 8 do not have the capability to remove the volume
- control block (VCB) entry which is allocated for /RAM when it is installed.
-
- In later versions of ProDOS 8 (1.2 and later), this problem no longer exists,
- and you should issue an ON_LINE call to a device after disconnecting it. This
- call returns error $28 (no device connected), but it also erases the VCB entry
- for the disconnected device.
-
-
- Further Reference
- o ProDOS 8 Technical Reference Manual
- o ProDOS 8 Update Manual
-
-