OpenCores

cpu6502_tc - R6502 Processor Soft Core with accurate timing

Issue List
ADC & SBC: Overflow Flag wrongly computet #5
Closed fpga_is_funny opened this issue over 10 years ago
fpga_is_funny commented over 10 years ago

(Found by user)

The flag "Overflow" / "V" (Bit 6 in the Processor Status Register) is computed wrong in op codes "ADC" and "SBC". This flag was not 100% tested in my test environment in the past. Also this flag is rarely used by available software e.g for APPLE}{. The erroneous code segment lies in the block "fsm_execution_unit".

Will be corrected in the next upcoming production release as soon as possible.

fpga_is_funny commented over 5 years ago

Fixed in uploaded v1.4

fpga_is_funny closed this over 5 years ago

Assignee
No one
Labels
Bug