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- COMPUTER TIPS
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- From: Hautzenroeder 79756
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- I recently had a severe problem with
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- my 1541 disk drive which others may
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- experience. The problem I had was
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- that my 1541 would load programs and
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- read and write sequential files with
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- no problems, but if I were to save a
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- long program or format a disk, I would
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- start to experience READ/WRITE
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- problems. Two trips to the nearby
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- service center did not cure the
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- problem. Even when the service
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- technician showed me there were no
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- problems with the 1541 at the shop,
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- the same problem re-appeared the
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- moment I got home. Switching circuit
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- boards with another 1541 did not cure
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- the problem nor did adding a surge
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- protector. What I finally did was to
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- remove the 1541's cover and metal
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- shield and the problem disappeared!!
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- What happened was the wires going from
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- the READ/WRITE head to the circuit
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- board had a ground wire that was
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- touching the metal shield that covers
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- the circuit board. Insulating this
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- ground wire from the shield
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- permanently cured my problem.
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- From: Kober 75831
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- READING THE C-64 JOYSTICKS
- {$f7}{$f7}{$f7}{$f7}{$f7}{$f7}{$f7}{$f7}{$f7}{$f7}{$f7}{$f7}{$f7}{$f7}{$f7}{$f7}{$f7}{$f7}{$f7}{$f7}{$f7}{$f7}{$f7}{$f7}{$f7}{$f7}{$f7}{$f7}
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- Here are several short statements
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- that allow reading the joysticks from
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- BASIC.
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- J1 = Joystick in Port #1
- J2 = Joystick in Port #2
- F1 = Firebutton in Port #1
- F2 = Firebutton in Port #2
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- {SHIFT-*} {SHIFT-*} {SHIFT-*} {SHIFT-*} {SHIFT-*} {SHIFT-*} {SHIFT-*} {SHIFT-*} {SHIFT-*} {SHIFT-*} {SHIFT-*} {SHIFT-*} {SHIFT-*}
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- J1=NOT PEEK(56321) AND 15
- J2=NOT PEEK(56320) AND 15
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- The number listed below will be
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- returned in J1, or J2 for the position
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- shown:
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- POSITION NUMBER
- {$e3}{$e3}{$e3}{$e3}{$e3}{$e3}{$e3}{$e3}{$e3}{$e3} {$e3}{$e3}{$e3}{$e3}{$e3}{$e3}{$e3}{$e3}
- up --------------- 1
- down -------------- 2
- left -------------- 4
- right ------------- 8
- up-right ----------- 9
- up-left ------------ 5
- down-right ---------- 10
- down-left ----------- 6
- center ------------- 0
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- (Numbers 3 and 7 are not used)
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- {SHIFT-*} {SHIFT-*} {SHIFT-*} {SHIFT-*} {SHIFT-*} {SHIFT-*} {SHIFT-*} {SHIFT-*} {SHIFT-*} {SHIFT-*} {SHIFT-*} {SHIFT-*} {SHIFT-*}
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- F1=(NOT PEEK(56321) AND 16)/16
- F2=(NOT PEEK(56320) AND 16)/16
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- These will return a 1 if the button
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- is pressed, and a 0 if not.
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- Reading the joysticks and
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- firebuttons isn't the easiest thing to
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- understand. That's why I figured this
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- out and wrote it down. Maybe someone
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- else can benefit from this
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- information.
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- ---------< end of article >-----------
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