bridger%rcc@RAND-UNIX.ARPA (Bridger Mitchell) (01/31/88)
A year ago, curious about the speed of compilers vs. hand-optimized Z80 code, I wrote JETPRIME. It proved about 140% faster that Turbo-Modula 2, which itself was much faster than Turbo Pascal, BDS-C, and a number of 8088 compiled versions. JETPRIME, on 4Mhz Ampro Littleboard, was 4.1 sec for 10 iterations; TM2 was about 10. JETPRIME.LBR or JPRIME.LBR is available on ZNode-Central, 408-432-0821. It may also be on other boards, and simtel20. I'd be curious to hear how it holds up on the 280. My third-hand understanding is that the current z280 mask doesn't correctly handle code (and data?) changes that occur in the associative cache memory. Self-modifying code is therefore unreliable, and possibly there are problems with data values also. --bridger
dbraun@cadev4.intel.com (Doug Braun ~) (02/06/88)
In article <8801301850.AA19041@newton.arpa> bridger%rcc@RAND-UNIX.ARPA (Bridger Mitchell) writes: >My third-hand understanding is that the current z280 mask doesn't >correctly handle code (and data?) changes that occur in the >associative cache memory. Self-modifying code is therefore >unreliable, and possibly there are problems with data values also. I have heard: 1: The above is a problem only in 8-bit bus mode. (I use 16-bit) 2: The latest mask revision (due out any day now) has fixed this. Would it make sense to start a Z-280 mailing list? I have no idea how this is done. If a moderator is needed, I would volunteer. Doug Braun Intel Corp CAD 408 496-5939 / decwrl \ | hplabs | -| oliveb |- !intelca!mipos3!cadev4!dbraun | amd | \ qantel /
pekka@senilix.liu.se (Pekka Akselin [The Mad Midnight Hacker]) (02/18/88)
Hello! In article <1635@mipos3.intel.com> dbraun@cadev4.UUCP (Doug Braun ~) writes: >Would it make sense to start a Z-280 mailing list? I have no >idea how this is done. If a moderator is needed, I would volunteer. This is a good idea and put me on the list, please, if is started. Thanks in advance. I've bought a Z280 and I will investigate if my chip is a broken one. I need a correct chip 'cause I will exchange my old Z80 in my machine to a faster Z280. The Z80 is used as a (slow) IO processor. Bye. /pekka [...The Mad Midnight Hacker Strikes Again...] ______________________________________________________________________________ pekka@majestix.liu.se ...!uunet!enea!liuida!majestix!pekka Pekka Akselin, Univ. of Linkoping, Sweden (The Land Of The Midnight Hacker 8-) Bus error (core dumped)