Talk:Amiga 1200

message: The 68020 Amigas ran at 14MHz, while the 68000 Amigas ran at 7MHz. Is the statement accurate that the A1200 is four times as fast as the A500? --Jonathan Drain (talk) 21:00, 23 August 2008 (UTC)
replies: text: The 68020 had a 32-bit buss, while the old 68000 was saddled with a 16-bit buss. Also, the 68020 has faster instruction timings. IOW 2x speedup from not having to multiplex memory reads, 2x speed up from a clock speed boost, and 2x speed up from better instruction timings. Add some inefficiencies into the equation and 4 times faster seems like an accurate enough figure. It would of course vary from program to program, with some being faster still and others slower.--Anss123 (talk) 10:37, 24 August 2008 (UTC)
replies: text: Also don't forget that the 68020 has an instruction cache, whereas the 68000 does not.  It's definitely a large upgrade from the 68000.  Renegrade (talk) 10:27, 5 February 2011 (UTC)
replies: text: Without better source I would say it is original research. Xorxos (talk) 10:09, 6 February 2011 (UTC)
replies: text: Are you really going to be so pedantic as to make one of us provide your sorry ass with a link to the 68020 CPU wiki article and/or an online spec sheet? It ran at twice the speed, had twice the bus width, an onboard cache, and a few other generational improvements (extra instructions, better pipelining etc) that improved per-clock processing efficiency. It's as much of a speed bump from the 68000 as a 10Mhz 80286 would have been from a 5Mhz 8088, if not more so (or more precisely a 16Mhz 386DX vs an 8Mhz 286). 193.63.174.211 (talk) 17:23, 9 May 2012 (UTC)

text:  Does http://lowendmac.com/tech/chips.shtml qualify as reference? instructions per second doesn't, but the same speed comparison isn't disputed there. You can also look at RC5-72 comparison database and OGR comparison db, but those are based on highly specialized code, so mileage may vary. Zac67 (talk) 18:21, 9 May 2012 (UTC)

text: Er, 1/ gross memory speed will only affect operations that are heavily memory constrained (with these earlier generation chips, this isn't so much the case; single-clock operations didn't become common until at least the '030 and moreover the '040 era), so long as it isn't SUPER slow (like e.g. with the 68008 or i8088) and so doesn't hold everything up REALLY badly, 2/ the bus still runs at twice the speed, and has twice the bit width, so that means 4x as much being transferred per second... Did you mean that an unexpanded A1200 runs at 2 - 2.5x the speed of an A500 which has a decent amount of fastRAM on board? Because apparently adding it to the A1200 itself can mean a general doubling of processing speed thanks to a vast reduction in bus contention between the CPU and the graphics hardware. 193.63.174.211 (talk) 14:58, 6 June 2014 (UTC)
thread_title:  68020 four times faster than 68000 

message: I wonder if the IDE controller in the A1200 (or 600 or 4000) actually does support PIO Mode 2, as claimed.  http://hardware.amiga.hu/mod/a1200.html, http://www.thecryptmag.com/Online/16/PowerFlyer.html and http://www.amiga-hardware.com/showhardware.cgi?HARDID=1462 seem to indicate that Gayle is only capable of Mode 0.  Also, the A1200 user docs describe it as an "IDE" interface, the first ATA standard not being released until 1994 (when PIO modes 1 and 2 were added, according to this).  Reports I've read on forums indicate a maximum transfer rate of 2-2.5 MB/s, which is less than the 3.3 MB/s maximum for PIO Mode 0.  -- Screwtop (talk) 15:07, 21 August 2009 (UTC)
replies: text: It only supports PIO Mode 0. I dont know why someone claims mode 2 was supported. Xorxos (talk) 10:04, 6 February 2011 (UTC)
replies: text: Seconded. PIO modes 1+ were introduced with the ATA-1 standard in 1994. -- Zac67 (talk) 19:59, 11 August 2011 (UTC)
thread_title:  Does the A1200 IDE controller support PIO Mode 2? 

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