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Forum: Emulation and Simulation Topic: Yet another 65xxx bit of wishful thinking... |
| Sheep64 |
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Posted: Mon Feb 22, 2021 1:32 pm
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Replies: 25
Views: 16523
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| ... of simplified 65E4. I believe that your proposal might benefit from the Hudson T flag , although, by graph coloring, there is diminishing return when a 3-address machine has ... |
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Forum: General Discussions Topic: How would YOU extend the 6502? |
| Dr Jefyll |
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Posted: Fri Aug 17, 2018 7:02 pm
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Replies: 34
Views: 13217
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| ... in the realm of enhancements which *did* get implemented, I think the T Flag (a new bit in the Processor status register, included in the Hudson Soft HuC6280 and certain other CPU's) is worth remarking. From this post in the thread ... |
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Forum: General Discussions Topic: Overview of 6502-like cores, hard, soft, partial, overblown |
| Druzyek |
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Posted: Thu Jan 25, 2018 7:25 am
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Replies: 34
Views: 44253
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| ... as Cray Ze mentioned -X index addressing mode lets you use any zero page address pointed to by X as an accumulator. This is enabled with the new T flag. -The M50734 for example seems to divide its clock by 4. You can see two dividers on page 29 of the datasheet: http://pdf1.alldatasheet.com/datasheet-pdf/view/861/MITSUBISHI/M50734SP-10.html ... |
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Forum: Programming Topic: Saving bytes, byte by byte - an example |
| BigEd |
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Posted: Sat May 06, 2017 8:24 am
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Replies: 19
Views: 2543
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| ... 6280 here before , although I'd forgotten it. The [PC-Engine] uses the Hudson Soft 6280 , a 6502 variation which we have discussed before . It's ... instructions such as SAX, SAY and BSR) are undeniably cool, but the T Flag is a fundamental improvement, IMHO. Much though we all love the 65xx ... |
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Forum: General Discussions Topic: 65x02 variants |
| tomaitheous |
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Posted: Sun Sep 23, 2007 9:53 pm
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Replies: 15
Views: 13853
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| ... ZP in the assembler I use clc adc #$20 sta <$30 cla adc #$00 sta <$31 T flag code: ldx #$30 clc set adc #$20 inx set adc #$00 The contents of A are ... (mostly HK and JP sites). I know both the HuC6260 and HuC6270, both by Hudson, are easier to find but they aren't CPUs (graphic processors to interface ... |
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Forum: General Discussions Topic: 65x02 variants |
| fachat |
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Posted: Sun Sep 23, 2007 11:11 am
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Replies: 15
Views: 13853
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| ... Rockwell variant (with the extra RMBi,SMBi,TRB,TSB,etc opcodes) made by Hudson. the URL above is my normal source, plus this Commodore-related page ... although my MMU is external. SET - set the T flag. The T flag is right between the V and B flag. When the T flag is set, ... |
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Forum: General Discussions Topic: 65x02 variants |
| tomaitheous |
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Posted: Sat Sep 22, 2007 5:34 pm
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Replies: 15
Views: 13853
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| ... Rockwell variant (with the extra RMBi,SMBi,TRB,TSB,etc opcodes) made by Hudson. Just a quick list of features.. Swap register instructions - SAY, SAX, SXY. They don't effect flags, so it can be useful for using two regs to do 16bit adds or shifts. Branch instructions ... |
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