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/* Technical information */
The BIOS is in the AMSDOS ROM, and this uses the jumpblocks in RAM.
The AMSDOS ROM also uses part of the RAM for XDPB storage and a sector buffer.(The BASIC facing side of AMSDOS is not active.)
The TPA is limited because the CCP, BDOS and firmware jumpblocks are in main RAM. The result is a ~33KB TPA for a CPC system which is OK.
