Date: 2002-04-30 03:55:01
>What about the 6509? That is a 6502 with the difference that it has >4 more address lines. The output values of the 4 address bits is >determined by the values of register 0 and 1. register 1 is used for >the data load and store operations in the lda (),y and sta (),y >opcodes and reg. 0 otherwise. (r0/r1 maybe vice versa, but in principle >that is it). This chip is indeed and interesting one. The theme could be extended to include a full 8-bit paging offset, allowing 16MB rather than 1MB access. For the setting of the register one of the illegal fatal codes could be used as the operand. PLEASE TAKE NOTE: The contents of this email (including any attachments) may be privileged and confidential. Any unauthorised use of the contents is expressly prohibited. If you have received this email in error, please advise us immediately (you can contact us by telephone on +61 8 9441 2311 by reverse charge) and then permanently delete this email together with any attachments. We appreciate your co-operation. Whilst Orbital endeavours to take reasonable care to ensure that this email and any attachments are free from viruses or other defects, Orbital does not represent or warrant that such is explicitly the case (C) 2000: Orbital Engine Company (Australia) PTY LTD and its affiliates Message was sent through the cbm-hackers mailing list
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