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--- x68000:h.a.r.p_for_mc68000_-_cpu_accelerator_board [2012/01/26 02:33] – eidis
+++ x68000:h.a.r.p_for_mc68000_-_cpu_accelerator_board [2019/08/27 20:45] (current) – external edit 127.0.0.1
@@ Line 5: / Line 5: @@
 {{:x68000:harp_1.jpg|}}
-H.A.R.P for mc68000 was manufactured and sold by Jast Inc from 1994 and is accelerator board for X68000. This is a replacement board for the X68000 Built-in CPU and it is intended to be plugged into the CPU socket to increase processing speed.
+H.A.R.P for mc68000 was manufactured and sold by Jast Inc from 1994 and is accelerator board for X68000. This is a replacement board for the X68000 Built-in CPU and it is intended to be plugged into the CPU socket to increase processing speed. It is compatible with first generation models (except those that have soldered in CPUs) up to SUPER.
-The adaptive model, the first (except those that are soldered directly to the initial lot of CPU), the model is compatible with up to SUPER.
 {{:x68000:harp_2.jpg|}}
-There are red in the center dip switch SW1 on the basis of the photo, if you normally use, at any one time under the 2 (OFF) If it is OK to.
+There is a red dipswitch in the center of the photo labeled SW1. Both switches must be set to OFF for normal operation. Switch 1 must be set to ON when this device is used along with a Jast made memory expansion.
-SW1 when used with Memory Co., Ltd. - It is said that just made to ON 1.
-☆ ☆ ☆ Oh! ☆ ☆ ☆ X Information
+☆ ☆ ☆ Oh!X Information ☆ ☆ ☆
-H.A.R.P will be doubled to 20MHz internal clock of the CPU, 2x accelerator. But the body remains at 10MHz from the street now, I needed it to arbitration.
-That is, when calculated in the CPU is even moving into full-20MHZ, when accessing the external bus is considerably 落Tosane do not have to 10MHz.
-Therefore, the actual rate of say what happens, "We have only about 10% faster!" Is that it is not.
+H.A.R.P will accelerate the CPU and double its internal clock from 10MHz to 20MHz. However the factory default system bus speed will remain at 10MHz because it is needed for arbitration. That is, it will work in 20MHz when CPU calculates and in 10MHz when accessing external bus. Therefore, the actual speed increase is only about 10%.