On Mon, Jan 24, 2005 at 01:33:25AM +0000, Stuart Brady wrote: > BTW, does anyone know the format used for the messenger snapshots? > It really ought to be in the CSS FAQ. (Unless it's the +D format, in > which case it's already there.)
As far as I know, a Messenger snapshot is a 64K file containing a complete memory dump (including ROM). The contents of the registers are stored in a 22-byte block which ends at 0x3d00 (um, so that'd be 0x3cea starting address) in the same format as the register block of a Sam/+D SNAP file (where the register block is stored starting at byte 220 of the directory entry). Which seems to mean that they are in the order: IY IX DE' BC' HL' AF' DE BC HL Ir SP "Ir" is actually a spare byte followed by the contents of the I register. The R register, interrupt flag, value of AF and the execution address (PC) are all popped off the stack once the snapshot is loaded. imc
