Gloom, DOOM, Graffiti

[Oliver]

Crusher: is that article relavent to Amigas?  I didn't see anything mentioned there.

[Crusher]

Nah, just for 68040. But as I understand the 68040 uses L2 if there is any.  :-)

[keropi]

so atleast the 040 looks and uses cache...
if it was easy to implement, I bet at least phase5 would use some cache at least on their bppc/csppc cards... who knows why they decided against it...  :-?

[Doppie1200]

Perhaps because the RAM is fast enough to provide the CPU with data. L2 Cache is only interesting when RAM is the main bottleneck. Since Fastram is not shared by any other processors L1 cache might be sufficient.

[zipper]

 I bet at least phase5 would use some cache at least on their bppc/csppc cards... who knows why they decided against it...  :-?

Because every time a context switch happens you may lose what's in that cache or something like that.

[DamageX]

As long as the cache operates only on FASTMEM in the 32-bit
address space (where no other device can write, right?) then
it should be completely transparent to software.

I think an 020 or 030 would have much more to gain than an
040 or 060 since the cache on those chips is so much smaller
to begin with. The PPC should also have a lot to gain if my
experience with socket 5 PC motherboards is any indication.

On the original topic, I tried the graffiti.library from the
pnmview_grf archive and ADOOM runs but only with a blank
screen.

[Crusher]

Have you checked with Snoopdos? Maybe there is something else missing.  :-)

[Seiya]

The curious thing about ADOOM on my system is that shrinking the display window doesn't seem to speed it up much, so c2p must not be using that large a portion of CPU time. DOOM runs better on my 386DX with 32KB of external cache so I guess memory latency must weigh heavily. I wonder why Amiga CPU cards never had L2 cache

because L2 cache on amiga was useless

[Argus]

It's not even a 68020, but doesn't the ICDAdSpeed card have a small 'cache' of very quick non-system memory on it for it's 14MHz 68000?