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- Path: s126.the-spa.com!user
- From: doug.cotton@the-spa.com (Doug Cotton)
- Newsgroups: comp.sys.cbm
- Subject: 20 MHz 64... Does it scream?
- Date: Mon, 19 Feb 1996 22:34:46 -0500
- Organization: Creative Micro Designs, Inc.
- Message-ID: <doug.cotton-1902962234460001@s126.the-spa.com>
- NNTP-Posting-Host: s126.the-spa.com
- X-Newsreader: Yet Another NewsWatcher 2.0.6b4
-
- While we've been busy shaking down the hardware design on the SuperCPU, most of
- this has been done at 4 MHz. We wanted to wait until we felt the hardware was
- working well before trying to push the hand-wired prototype to 20 MHz.
-
- Earlier today Mark entered my office and stated flatly, "20 MHz works fine."
- My eyebrows shot up. Mark installed the SuperCPU prototype on the flat 128
- located in my office, powered up, and loaded the temporary DOS into the unit.
- He then typed this short program:
-
- 10 TI$="000000"
- 20 FORI=1TO10000:NEXT
- 30 PRINTTI
-
- Leaving the SuperCPU disabled, the result printed after a few seconds: 660.
- Enabling the SuperCPU, he again ran the program: 31.
-
- I grabbed a calcultor... 660/31... =21.290322581...
-
- "Wait a minute!", I exclaimed. "Something is wrong here! If the CPU is only
- running at 20 MHz, how can the code run over 21 times faster than at 1 MHz?"
-
- Mark just smiled.
-
- We spent a couple of hours testing various programs, getting much the kind of
- results we expected on most. Some surprises here and there though... quite a
- few of the games we tried (ML commercial games) worked fine, with no speed
- increase at 20 MHz. We had expected pretty much all games would fail, running
- too fast to be usable. Apparently these titles ran everything via timed events.
- Frogger was unplayable, though! Blood Money did something we didn't expect...
- it exhibited less raster garbage at 20 MHz than it normally did on a stock 1 MHz
- machine. Just a side effect of the particular raster timing, I'm sure.
-
- I won't be giving regular reports on the testing, but I thought some of you
- would like to hear about some of the initial tests at 20 MHz. ;)
-
-
- Doug Cotton
- E-mail: doug.cotton@the-spa.com
-
-
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