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- = TT_CONST.TXT =
- = =
- = Details for constructing a Team Tap compatible joypad =
- = multiplexer. To be read in conjunction with the series =
- = of Articles in Atari Computing magazine. =
- = =
- = See also www.ataricomputing.com =
- = and www.compsoc.man.ac.uk/~xav =
- = =
- = This information is provided without any implied or =
- = explicit warranty. Neither Xav nor Atari Computing can =
- = be held responsible for any loss or damage caused as a =
- = result of work carried out based on these instructions =
-
-
-
- = Tracks to Cut =
-
- You will need to cut the copper tracks at the following locations:-
-
- D15, D28
- K6 to K15
- L6 to L15, L17 to L28
- P6, P8, P12, P14
- Q7, Q9 to Q11
- S29
- U2, U4, U12, U14
- V29
- X2, X4, X7, X9, X12, X14
- AA2, AA4, AA7, AA9, AA12, AA14
- AD2, AD4, AD7, AD9, AD12, AD14
-
-
-
- = Links =
-
- You will need to put metal links between the following holes
- (start:finish) :-
-
- A15:A16
- B1:B15, B16:B28
- D2:D7
- E3:E9
- F4:F11, F15:F30
- G5:G13, G27:G29
- H6:H15, H28:H30
- N1:N6, N9:N11
- P7:P9, P11:P30
- Q1:Q12, Q16:Q17
- R2:R8, R22:R23
- S1:S14
- T4:T10
- U8:U29
-
-
-
- = PCB Pins =
-
- These are put in with a hot soldering iron from the track side of the
- board. They should also then be soldered into place to ensure a good
- electrical connection:-
-
- A1, A12, A14, A30
- H17 to H27
- N8, N12, N14
- P10
- S18 to S22, S24 to S28
- W2, W4, W7, W9, W12, W14, W29, W30
- X29
- Z2, Z4, Z7, Z9, Z12, Z14, Z29, Z30
- AA29
- AC2, AC4, AC7, AC9, AC12, AC14, AC29, AC30
- AD29
- AE29
- AF2, AF4, AF7, AF9, AF12, AF14, AF29, AF30
-
-
-
- = Resistors =
-
- These can be soldered either way round. Note that one resistor is a
- different value to the others. Resistor values are designated by
- coloured stripes, as below:-
-
- 1k resistor (Brown|Brown|Red or Brown|Black|Black|Brown) - Q23:Q30
- 4k7 resistors (Yellow|Purple|Red or Yellow|Purple|Black|Brown) -
- E1:E2, F1:F3, G1:G4, H1:H5, R12:R13, R14:R15
-
-
-
- = Diodes =
-
- Diodes have to go a certain way round. In the following, the first
- hole listed MUST be nearest the end with the stripe:-
-
- R29:T29
- V2:V3, V4:V5, V7:V8, V9:V10, V12:V13, V14:V15
- Y2:Y3, Y4:Y5, Y7:Y8, Y9:Y10, Y12:Y13, Y14:Y15
- AB2:AB3, AB4:AB5, AB7:AB8, AB9:AB10, AB12:AB13, AB14:AB15
- AE2:AE3, AE4:AE5, AE7:AE8, AE9:AE10, AE12:AE13, AE14:AE15
-
-
-
-
- = Integrated Circuits =
-
- First solder the sockets into place, then put the chips into the
- sockets as the final step of circuit board construction. The top of
- the chip (and preconstructed sockets) is marked by a scalloped edge,
- or a dot in the top left corner. For both chips in this project, the
- top edge goes towards the top of the board, i.e. row 6 for the 74HC244
- and row 17 for the 74HC154. The latter also comes in two flavours,
- wide or narrow. Details are given for both, but you should only use
- the one that is appropriate to the chip you have:-
-
- 74HC244 - J6 to J15 and M6 to M15
- 74HC154 (Narrow) - J17 to J28 and M17 to M28
- 47HC154 (Wide) - I17 to I28 and O17 to O28
-
-
-
- = Capacitors =
-
- You have two varieties of capacitors. The "ceramic disk" type
- (probably beige and disk-shaped, no markings to indicate polarity) can
- be inserted either way. The "electrolytic" (probably blue or purple,
- looks like a small can with two legs) has to be inserted a particular
- way. In most cases the _negative_ leg is marked by a stripe enclosing
- minus symbols which runs down one side towards the leg in question.
- Common practice, however, marks the positive connection on a circuit
- diagram. In the following, the _positive_ leg is listed first, and the
- _negative_ leg listed second. Please ensure that you get this
- component inserted the correct way round, as they can, and do,
- explode:-
-
- Ceramic disk - C15:E15, C28:E28
- Electrolytic - G16:G15
-
-
-
- = Plug =
-
- The plug is the male connector which attaches to the EJP. The
- connections below are show as (circuit board:plug) where the second
- number simply represents the corresponding pin on the plug itself. The
- connections to the circuit board are all made indirectly by soldering
- wires to the previously inser
- ed PCB pins:-
-
- A1:7, A12:14, A14:13, A30:9
- N8:6, N12:11, N14:12
- P10:10
- S18:4, S19:3, S20:2, S21:1, S22:8
-
-
-
- = Socket A =
-
- This is the first of the four team tap EJPs, and is numbered in a
- similar manner to the plug:-
-
- H24:1, S25:4, S26:3, S28:2
- W2:10, W4:12, W7:6, W9:11, W12:14, W14:13, W29:8, W30:9
- X29:7
-
-
-
- = Socket B =
-
- H17:4, H18:3, H19:2, H20:1
- Z2:10, Z4:12, Z7:6, Z9:11, Z12:14, Z14:13, Z29:8, Z30:9
- AA29:7
-
-
-
- = Socket C =
-
- H21:4, H22:3, H23:2, H25:1
- AC2:10, AC4:12, AC7:6, AC9:11, AC12:14, AC14:13, AC29:8, AC30:9
- AD29:7
-
-
-
- = Socket D =
-
- H26:4, H27:3
- S24:1, S27:2
- AE29:8
- AF2:10, AF4:12, AF7:6, AF9:11, AF12:14, AF14:13, AF29:7, AF30:9
-
-
-
-
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-