On Sun, Jun 10, 2018 at 04:06:21PM +0200, groepaz@gmx.net wrote: > Am Sonntag, 10. Juni 2018, 15:55:10 CEST schrieb Segher Boessenkool: > > On Sun, Jun 10, 2018 at 03:39:42PM +0200, groepaz@gmx.net wrote: > > > if its similar as with what ppl did with 6522 and 6526 (i would assume it > > > is) - then expect every dirty trick you can imagine being used by real > > > world software. for example even the subtle differences between the port > > > drivers of port 1 and port 2 are relevant in 6522/26 emulation. > > > > (Is there any difference on the 6526?) > > yes, unfortunately its not documented in detail anywhere (like in the 6522 > datasheet) - but experimentation shows that very likely the port drivers have > the exact same differences/properties: > > the obligatory test program is here: > > https://sourceforge.net/p/vice-emu/code/HEAD/tree/testprogs/CIA/ciaports/ The datasheet for the 6526 shows PA and PB with exactly the same source current (and other electrical characteristics). Looking at the actual silicon die I didn't notice any difference either, hrm. Maybe I missed something. Or those test programs are seeing the effect of the keyboard circuitry? SegherReceived on 2018-06-10 17:02:26
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