Difference between revisions of "Tektronix 4024"
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m (memory-mapped registers) |
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| model = 4024 | | model = 4024 | ||
| image = Tektronix_4024.jpg | | image = Tektronix_4024.jpg | ||
− | | intro_year = | + | | intro_year = 1977 |
+ | | intro_month = November | ||
| intro_price = $2,995 | | intro_price = $2,995 | ||
| discontinued_year = 1982 | | discontinued_year = 1982 | ||
Line 9: | Line 10: | ||
| phosphor = P39 green | | phosphor = P39 green | ||
| refresh_rate = 60 | | refresh_rate = 60 | ||
− | | | + | | char_matrix = 7x9 |
+ | | char_cell = 8x14 | ||
| char_resolution = 80x34 | | char_resolution = 80x34 | ||
| interface = RS-232C | | interface = RS-232C | ||
| baud_rates = 75, 110, 150, 300, 600, 1200, 2400, 4800, 9600 | | baud_rates = 75, 110, 150, 300, 600, 1200, 2400, 4800, 9600 | ||
| interface2 = 20 mA current loop | | interface2 = 20 mA current loop | ||
− | | ram = 4 | + | | cpu = Intel 8080 |
+ | | ram = 4 KB to 32 KB | ||
}} | }} | ||
− | The {{PAGENAME}} terminal was introduced in 1978 at a price of $2,995.{{ref tektronix catalog | + | The {{PAGENAME}} terminal was introduced in 1978 at a price of $2,995.{{Computerworld |
+ | | id=5OsHzHowTLIC | ||
+ | | page=51 | ||
+ | | title="Tektronix 4025 CRT Turns Alphanumerics to Graphics" | ||
+ | | date=November 14, 1977 | ||
+ | }}{{ref tektronix catalog | ||
| year=1978 | | year=1978 | ||
| accessdate=April 17, 2012 | | accessdate=April 17, 2012 | ||
}} | }} | ||
+ | |||
+ | {| class="wikitable" | ||
+ | |+ Options | ||
+ | ! style="padding: 1ex;" | Part Number | ||
+ | ! style="padding: 1ex;" | Price | ||
+ | ! style="padding: 1ex;" | Description | ||
+ | |- | ||
+ | | style="padding: 1ex;" | Option 2 | ||
+ | | style="padding: 1ex; text-align: center;" | $230 | ||
+ | | style="padding: 1ex;" | Current Loop Interface | ||
+ | |- | ||
+ | | style="padding: 1ex;" | Option 3 | ||
+ | | style="padding: 1ex; text-align: center;" | $300 | ||
+ | | style="padding: 1ex;" | RS-232 Peripheral Interface | ||
+ | |- | ||
+ | | style="padding: 1ex;" | Option 10 | ||
+ | | style="padding: 1ex; text-align: center;" | $250 | ||
+ | | style="padding: 1ex;" | Polling Interface | ||
+ | |- | ||
+ | | style="padding: 1ex;" | Option 20 | ||
+ | | style="padding: 1ex; text-align: center;" | $250 | ||
+ | | style="padding: 1ex;" | 8 KB Display RAM | ||
+ | |- | ||
+ | | style="padding: 1ex;" | Option 21 | ||
+ | | style="padding: 1ex; text-align: center;" | $750 | ||
+ | | style="padding: 1ex;" | 16 KB Display RAM | ||
+ | |- | ||
+ | | style="padding: 1ex;" | Option 22 | ||
+ | | style="padding: 1ex; text-align: center;" | $1,750 | ||
+ | | style="padding: 1ex;" | 32 KB Display RAM | ||
+ | |- | ||
+ | | style="padding: 1ex;" | Option 32 | ||
+ | | style="padding: 1ex; text-align: center;" | $150 | ||
+ | | style="padding: 1ex;" | Ruling Characters | ||
+ | |- | ||
+ | | style="padding: 1ex;" | Option 48 | ||
+ | | style="padding: 1ex; text-align: center;" | No Charge | ||
+ | | style="padding: 1ex;" | 220 Volt Power | ||
+ | |} | ||
+ | |||
+ | {| class="wikitable" | ||
+ | |+ Memory Map | ||
+ | ! style="padding: 1ex;" | Start | ||
+ | ! style="padding: 1ex;" | End | ||
+ | ! style="padding: 1ex;" | Description | ||
+ | |- | ||
+ | | style="padding: 1ex;" | <code>0x0000</code> || style="padding: 1ex;" | <code>0x00FF</code> || style="padding: 1ex;" | Power-Up/Interrupt ROM | ||
+ | |- | ||
+ | | style="padding: 1ex;" | <code>0x0100</code> || style="padding: 1ex;" | <code>0x07FF</code> || style="padding: 1ex;" | Unused (1792 bytes) | ||
+ | |- | ||
+ | | style="padding: 1ex;" | <code>0x0800</code> || style="padding: 1ex;" | <code>0x0BFF</code> || style="padding: 1ex;" | I/O Address | ||
+ | |- | ||
+ | | style="padding: 1ex; text-align: center;" colspan="2" | <code>0x0801</code> || style="padding: 1ex;" | Processor-Initiated Reset (Not used.) | ||
+ | |- | ||
+ | | style="padding: 1ex; text-align: center;" colspan="2" | <code>0x0810</code> || style="padding: 1ex;" | Display Memory Status Register | ||
+ | |- | ||
+ | | style="padding: 1ex; text-align: center;" colspan="2" | <code>0x0811</code> || style="padding: 1ex;" | Display Memory VDRIVE Detector Reset | ||
+ | |- | ||
+ | | style="padding: 1ex; text-align: center;" colspan="2" | <code>0x0820</code> || style="padding: 1ex;" | Host Port Status Word | ||
+ | |- | ||
+ | | style="padding: 1ex; text-align: center;" colspan="2" | <code>0x0822</code> || style="padding: 1ex;" | Host Port USART Data Word | ||
+ | |- | ||
+ | | style="padding: 1ex; text-align: center;" colspan="2" | <code>0x0823</code> || style="padding: 1ex;" | Host Port USART Command/Status Word | ||
+ | |- | ||
+ | | style="padding: 1ex; text-align: center;" colspan="2" | <code>0x0830</code> || style="padding: 1ex;" | Keyboard Port Status Word | ||
+ | |- | ||
+ | | style="padding: 1ex; text-align: center;" colspan="2" | <code>0x0830</code> || style="padding: 1ex;" | Keyboard Port Reset Line | ||
+ | |- | ||
+ | | style="padding: 1ex; text-align: center;" colspan="2" | <code>0x0830</code> || style="padding: 1ex;" | Keyboard Port Data Word | ||
+ | |- | ||
+ | | style="padding: 1ex;" | <code>0x0C00</code> || style="padding: 1ex;" | <code>0x0FFF</code> || style="padding: 1ex;" | Fix-It ROM | ||
+ | |- | ||
+ | | style="padding: 1ex;" | <code>0x1000</code> || style="padding: 1ex;" | <code>0x4FFF</code> || style="padding: 1ex;" | System Firmware | ||
+ | |- | ||
+ | | style="padding: 1ex;" | <code>0x5000</code> || style="padding: 1ex;" | <code>0x7FFF</code> || style="padding: 1ex;" | Unused (12 KB) | ||
+ | |- | ||
+ | | style="padding: 1ex;" | <code>0x8000</code> || style="padding: 1ex;" | <code>0xEFFF</code> || style="padding: 1ex;" | Additional Display Memory | ||
+ | |- | ||
+ | | style="padding: 1ex;" | <code>0xF000</code> || style="padding: 1ex;" | <code>0xFFFF</code> || style="padding: 1ex;" | Primary Display Memory | ||
+ | |} | ||
+ | |||
+ | The boards in the system are connected via a motherboard with 2x36 edge card connectors. | ||
+ | {| class="wikitable" | ||
+ | |+ Motherboard Bus Signals | ||
+ | ! style="padding: 1ex;" | Flip Side | ||
+ | ! style="padding: 1ex;" | Pin | ||
+ | ! style="padding: 1ex;" | Pin | ||
+ | ! style="padding: 1ex;" | Component Side | ||
+ | |- | ||
+ | | style="padding: 1ex; text-align: right;" | <code>GND</code> || style="padding: 1ex; text-align: right" | <code> 1-</code> || style="padding: 1ex;" | <code>-2</code> || style="padding: 1ex;" | <code>GND</code> | ||
+ | |- | ||
+ | | style="padding: 1ex; text-align: right;" | <code>-5V</code> || style="padding: 1ex; text-align: right;" | <code> 3-</code> || style="padding: 1ex;" | <code>-4</code> || style="padding: 1ex;" | <code>-5V</code> | ||
+ | |- | ||
+ | | style="padding: 1ex; text-align: right;" | <code>SPARE</code> || style="padding: 1ex; text-align: right;" | <code>5 </code> || style="padding: 1ex;" | <code> 6</code> || style="padding: 1ex;" | <code>SPARE</code> | ||
+ | |- | ||
+ | | style="padding: 1ex; text-align: right;" | <code>-12V</code> || style="padding: 1ex; text-align: right;" | <code>7-</code> || style="padding: 1ex;" | <code>-8</code> || style="padding: 1ex;" | <code>-12V</code> | ||
+ | |- | ||
+ | | style="padding: 1ex; text-align: right;" | <code>SPARE</code> || style="padding: 1ex; text-align: right;" | <code>9 </code> || style="padding: 1ex;" | <code> 10</code> || style="padding: 1ex;" | <code>SPARE</code> | ||
+ | |- | ||
+ | | style="padding: 1ex; text-align: right;" | <code>12V</code> || style="padding: 1ex; text-align: right;" | <code>11-</code> || style="padding: 1ex;" | <code>-12</code> || style="padding: 1ex;" | <code>12V</code> | ||
+ | |- | ||
+ | | style="padding: 1ex; text-align: right;" | <code>SPARE</code> || style="padding: 1ex; text-align: right;" | <code>13 </code> || style="padding: 1ex;" | <code> 14</code> || style="padding: 1ex;" | <code>SPARE</code> | ||
+ | |- | ||
+ | | style="padding: 1ex; text-align: right;" | <code>+5V</code> || style="padding: 1ex; text-align: right;" | <code>15-</code> || style="padding: 1ex;" | <code>-16</code> || style="padding: 1ex;" | <code>+5V</code> | ||
+ | |- | ||
+ | | style="padding: 1ex; text-align: right;" | <code>RDIS</code> || style="padding: 1ex; text-align: right;" | <code>17@</code> || style="padding: 1ex;" | <code> 18</code> || style="padding: 1ex;" | <code>SPARE</code> | ||
+ | |- | ||
+ | | style="padding: 1ex; text-align: right;" | <code>BA0</code> || style="padding: 1ex; text-align: right;" | <code>19#</code> || style="padding: 1ex;" | <code>#20</code> || style="padding: 1ex;" | <code>BA1</code> | ||
+ | |- | ||
+ | | style="padding: 1ex; text-align: right;" | <code>BA2</code> || style="padding: 1ex; text-align: right;" | <code>21#</code> || style="padding: 1ex;" | <code>#22</code> || style="padding: 1ex;" | <code>BA3</code> | ||
+ | |- | ||
+ | | style="padding: 1ex; text-align: right;" | <code>BA4</code> || style="padding: 1ex; text-align: right;" | <code>23#</code> || style="padding: 1ex;" | <code>#24</code> || style="padding: 1ex;" | <code>BA5</code> | ||
+ | |- | ||
+ | | style="padding: 1ex; text-align: right;" | <code>BA6</code> || style="padding: 1ex; text-align: right;" | <code>25#</code> || style="padding: 1ex;" | <code>#26</code> || style="padding: 1ex;" | <code>BA7</code> | ||
+ | |- | ||
+ | | style="padding: 1ex; text-align: right;" | <code>BA8</code> || style="padding: 1ex; text-align: right;" | <code>27#</code> || style="padding: 1ex;" | <code>#28</code> || style="padding: 1ex;" | <code>BA9</code> | ||
+ | |- | ||
+ | | style="padding: 1ex; text-align: right;" | <code>BA10</code> || style="padding: 1ex; text-align: right;" | <code>29#</code> || style="padding: 1ex;" | <code>#30</code> || style="padding: 1ex;" | <code>BA11</code> | ||
+ | |- | ||
+ | | style="padding: 1ex; text-align: right;" | <code>BA12</code> || style="padding: 1ex; text-align: right;" | <code>31#</code> || style="padding: 1ex;" | <code>#32</code> || style="padding: 1ex;" | <code>BA13</code> | ||
+ | |- | ||
+ | | style="padding: 1ex; text-align: right;" | <code>BA14</code> || style="padding: 1ex; text-align: right;" | <code>33#</code> || style="padding: 1ex;" | <code>#34</code> || style="padding: 1ex;" | <code>BA15</code> | ||
+ | |- | ||
+ | | style="padding: 1ex; text-align: right;" | <code>WACK</code> || style="padding: 1ex; text-align: right;" | <code>35#</code> || style="padding: 1ex;" | <code>$36</code> || style="padding: 1ex;" | <code>RESET</code> | ||
+ | |- | ||
+ | | style="padding: 1ex; text-align: right;" | <code>PWDN</code> || style="padding: 1ex; text-align: right;" | <code>37-</code> || style="padding: 1ex;" | <code>%38</code> || style="padding: 1ex;" | <code>IOADR</code> | ||
+ | |- | ||
+ | | style="padding: 1ex; text-align: right;" | <code>READ</code> || style="padding: 1ex; text-align: right;" | <code>39#</code> || style="padding: 1ex;" | <code>#40</code> || style="padding: 1ex;" | <code>WRITE</code> | ||
+ | |- | ||
+ | | style="padding: 1ex; text-align: right;" | <code>WAIT</code> || style="padding: 1ex; text-align: right;" | <code>41@</code> || style="padding: 1ex;" | <code>@42</code> || style="padding: 1ex;" | <code>BRQ</code> | ||
+ | |- | ||
+ | | style="padding: 1ex; text-align: right;" | <code>BGIN</code> || style="padding: 1ex; text-align: right;" | <code>43*</code> || style="padding: 1ex;" | <code>*44</code> || style="padding: 1ex;" | <code>BGOUT</code> | ||
+ | |- | ||
+ | | style="padding: 1ex; text-align: right;" | <code>IA0</code> || style="padding: 1ex; text-align: right;" | <code>45%</code> || style="padding: 1ex;" | <code>%46</code> || style="padding: 1ex;" | <code>IA1</code> | ||
+ | |- | ||
+ | | style="padding: 1ex; text-align: right;" | <code>IA2</code> || style="padding: 1ex; text-align: right;" | <code>47%</code> || style="padding: 1ex;" | <code>@48</code> || style="padding: 1ex;" | <code>IRQ</code> | ||
+ | |- | ||
+ | | style="padding: 1ex; text-align: right;" | <code>LCLK</code> || style="padding: 1ex; text-align: right;" | <code>49%</code> || style="padding: 1ex;" | <code>%50</code> || style="padding: 1ex;" | <code>HCLK</code> | ||
+ | |- | ||
+ | | style="padding: 1ex; text-align: right;" | <code>PB0</code> || style="padding: 1ex; text-align: right;" | <code>51*</code> || style="padding: 1ex;" | <code>*52</code> || style="padding: 1ex;" | <code>PB1</code> | ||
+ | |- | ||
+ | | style="padding: 1ex; text-align: right;" | <code>PB2</code> || style="padding: 1ex; text-align: right;" | <code>53*</code> || style="padding: 1ex;" | <code>*54</code> || style="padding: 1ex;" | <code>PB3</code> | ||
+ | |- | ||
+ | | style="padding: 1ex; text-align: right;" | <code>PB4</code> || style="padding: 1ex; text-align: right;" | <code>55*</code> || style="padding: 1ex;" | <code>*56</code> || style="padding: 1ex;" | <code>PB5</code> | ||
+ | |- | ||
+ | | style="padding: 1ex; text-align: right;" | <code>PB6</code> || style="padding: 1ex; text-align: right;" | <code>57*</code> || style="padding: 1ex;" | <code>*58</code> || style="padding: 1ex;" | <code>PB7</code> | ||
+ | |- | ||
+ | | style="padding: 1ex; text-align: right;" | <code>PB8</code> || style="padding: 1ex; text-align: right;" | <code>59*</code> || style="padding: 1ex;" | <code>*60</code> || style="padding: 1ex;" | <code>PB9</code> | ||
+ | |- | ||
+ | | style="padding: 1ex; text-align: right;" | <code>PB10</code> || style="padding: 1ex; text-align: right;" | <code>61*</code> || style="padding: 1ex;" | <code>*62</code> || style="padding: 1ex;" | <code>PB11</code> | ||
+ | |- | ||
+ | | style="padding: 1ex; text-align: right;" | <code>BD0</code> || style="padding: 1ex; text-align: right;" | <code>63#</code> || style="padding: 1ex;" | <code>#64</code> || style="padding: 1ex;" | <code>BD1</code> | ||
+ | |- | ||
+ | | style="padding: 1ex; text-align: right;" | <code>BD2</code> || style="padding: 1ex; text-align: right;" | <code>65#</code> || style="padding: 1ex;" | <code>#66</code> || style="padding: 1ex;" | <code>BD3</code> | ||
+ | |- | ||
+ | | style="padding: 1ex; text-align: right;" | <code>BD4</code> || style="padding: 1ex; text-align: right;" | <code>67#</code> || style="padding: 1ex;" | <code>#68</code> || style="padding: 1ex;" | <code>BD5</code> | ||
+ | |- | ||
+ | | style="padding: 1ex; text-align: right;" | <code>BD6</code> || style="padding: 1ex; text-align: right;" | <code>69#</code> || style="padding: 1ex;" | <code>#70</code> || style="padding: 1ex;" | <code>BD7</code> | ||
+ | |- | ||
+ | | style="padding: 1ex; text-align: right;" | <code>GND</code> || style="padding: 1ex; text-align: right;" | <code>71-</code> || style="padding: 1ex;" | <code>-72</code> || style="padding: 1ex;" | <code>GND</code> | ||
+ | |} | ||
+ | Pin numbers are be annotated with a designation indicating their electrical characteristics as follows: | ||
+ | {| class="wikitable" | ||
+ | | style="padding: 1ex;" | <code>-</code> || Power supply pin | ||
+ | |- | ||
+ | | style="padding: 1ex;" | <code>%</code> || Pin driven by the processor board with no pull up resistor | ||
+ | |- | ||
+ | | style="padding: 1ex;" | <code>$</code> || Pin driven by the processor board with a pull up through a 2.7K resistor to +4.3V | ||
+ | |- | ||
+ | | style="padding: 1ex;" | <code>#</code> || Tri-state pin with a pull up through a 2.7K resistor to +4.3V | ||
+ | |- | ||
+ | | style="padding: 1ex;" | <code>@</code> || Open collector pin with a pull up through a 1K resistor to +4.3V | ||
+ | |- | ||
+ | | style="padding: 1ex;" | <code>*</code> || Non-bused signals which are not necessarily the same at every connector. | ||
+ | |} | ||
== [[Manx]] == | == [[Manx]] == | ||
− | * | + | * {{manx details|5,18548|4024 Computer Display Terminal Operator's Manual}}, January, 1978 |
− | * | + | * {{manx details|5,16290|4024 and 4025 Computer Display Terminals Service Manual (Vol. 1, Theory of Operation)}}, January, 1983 |
+ | |||
+ | ==Images== | ||
+ | <gallery> | ||
+ | File:Tektronix 4024 401321367011-1.jpg | ||
+ | File:Tektronix 4024 401321367011-2.jpg | ||
+ | File:Tektronix 4024 401321367011-3.jpg | ||
+ | File:Tektronix 4024 401321367011-4.jpg | ||
+ | File:Tektronix 4024 401321367011-5.jpg | ||
+ | File:Tektronix 4024 401321367011-6.jpg | ||
+ | File:Tektronix 4024 401321367011-7.jpg | ||
+ | File:Tektronix 4024 401321367011-8.jpg | ||
+ | File:Tektronix 4024 401321367011-9.jpg | ||
+ | File:Tektronix 4024 401321367011-10.jpg|Processor/Comm board | ||
+ | File:Tektronix 4024 401321367011-11.jpg|Display Controller board | ||
+ | File:Tektronix 4024 401321367011-12.jpg|Display Memory board | ||
+ | File:Tektronix 4024 401321367011-13.jpg|Interior | ||
+ | </gallery> | ||
{{References}} | {{References}} | ||
Line 30: | Line 230: | ||
[[Category:Tektronix|4024]] | [[Category:Tektronix|4024]] | ||
{{category raster}} | {{category raster}} | ||
− | [[Category: | + | [[Category:1977]] |
+ | {{stub}} |
Latest revision as of 00:24, 17 July 2018
Tektronix 4024 | |
---|---|
Manufacturer | Tektronix |
Model | 4024 |
Lifetime | |
Introduced | November, 1977 |
Introductory Price | $2,995 |
Discontinued | 1982 |
Communication | |
Interfaces |
RS-232C, 20 mA current loop |
Baud Rates | 75, 110, 150, 300, 600, 1200, 2400, 4800, 9600 |
Display | |
Size | 12-inch |
Phosphor | P39 green |
Refresh Rate | 60 Hz |
Character Modes | |
Resolution | 80x34 |
Matrix | 7x9 |
Cell | 8x14 |
Firmware | |
CPU | Intel 8080 |
RAM | 4 KB to 32 KB |
The Tektronix 4024 terminal was introduced in 1978 at a price of $2,995.[1][2]
Part Number | Price | Description |
---|---|---|
Option 2 | $230 | Current Loop Interface |
Option 3 | $300 | RS-232 Peripheral Interface |
Option 10 | $250 | Polling Interface |
Option 20 | $250 | 8 KB Display RAM |
Option 21 | $750 | 16 KB Display RAM |
Option 22 | $1,750 | 32 KB Display RAM |
Option 32 | $150 | Ruling Characters |
Option 48 | No Charge | 220 Volt Power |
Start | End | Description |
---|---|---|
0x0000 |
0x00FF |
Power-Up/Interrupt ROM |
0x0100 |
0x07FF |
Unused (1792 bytes) |
0x0800 |
0x0BFF |
I/O Address |
0x0801 |
Processor-Initiated Reset (Not used.) | |
0x0810 |
Display Memory Status Register | |
0x0811 |
Display Memory VDRIVE Detector Reset | |
0x0820 |
Host Port Status Word | |
0x0822 |
Host Port USART Data Word | |
0x0823 |
Host Port USART Command/Status Word | |
0x0830 |
Keyboard Port Status Word | |
0x0830 |
Keyboard Port Reset Line | |
0x0830 |
Keyboard Port Data Word | |
0x0C00 |
0x0FFF |
Fix-It ROM |
0x1000 |
0x4FFF |
System Firmware |
0x5000 |
0x7FFF |
Unused (12 KB) |
0x8000 |
0xEFFF |
Additional Display Memory |
0xF000 |
0xFFFF |
Primary Display Memory |
The boards in the system are connected via a motherboard with 2x36 edge card connectors.
Flip Side | Pin | Pin | Component Side |
---|---|---|---|
GND |
1- |
-2 |
GND
|
-5V |
3- |
-4 |
-5V
|
SPARE |
5 |
6 |
SPARE
|
-12V |
7- |
-8 |
-12V
|
SPARE |
9 |
10 |
SPARE
|
12V |
11- |
-12 |
12V
|
SPARE |
13 |
14 |
SPARE
|
+5V |
15- |
-16 |
+5V
|
RDIS |
17@ |
18 |
SPARE
|
BA0 |
19# |
#20 |
BA1
|
BA2 |
21# |
#22 |
BA3
|
BA4 |
23# |
#24 |
BA5
|
BA6 |
25# |
#26 |
BA7
|
BA8 |
27# |
#28 |
BA9
|
BA10 |
29# |
#30 |
BA11
|
BA12 |
31# |
#32 |
BA13
|
BA14 |
33# |
#34 |
BA15
|
WACK |
35# |
$36 |
RESET
|
PWDN |
37- |
%38 |
IOADR
|
READ |
39# |
#40 |
WRITE
|
WAIT |
41@ |
@42 |
BRQ
|
BGIN |
43* |
*44 |
BGOUT
|
IA0 |
45% |
%46 |
IA1
|
IA2 |
47% |
@48 |
IRQ
|
LCLK |
49% |
%50 |
HCLK
|
PB0 |
51* |
*52 |
PB1
|
PB2 |
53* |
*54 |
PB3
|
PB4 |
55* |
*56 |
PB5
|
PB6 |
57* |
*58 |
PB7
|
PB8 |
59* |
*60 |
PB9
|
PB10 |
61* |
*62 |
PB11
|
BD0 |
63# |
#64 |
BD1
|
BD2 |
65# |
#66 |
BD3
|
BD4 |
67# |
#68 |
BD5
|
BD6 |
69# |
#70 |
BD7
|
GND |
71- |
-72 |
GND
|
Pin numbers are be annotated with a designation indicating their electrical characteristics as follows:
- |
Power supply pin |
% |
Pin driven by the processor board with no pull up resistor |
$ |
Pin driven by the processor board with a pull up through a 2.7K resistor to +4.3V |
# |
Tri-state pin with a pull up through a 2.7K resistor to +4.3V |
@ |
Open collector pin with a pull up through a 1K resistor to +4.3V |
* |
Non-bused signals which are not necessarily the same at every connector. |
Manx
- 4024 Computer Display Terminal Operator's Manual, January, 1978
- 4024 and 4025 Computer Display Terminals Service Manual (Vol. 1, Theory of Operation), January, 1983
Images
References
- ↑ "Tektronix 4025 CRT Turns Alphanumerics to Graphics", Computerworld, November 14, 1977, pg. 51
- ↑ "Tektronix Catalog". Tektronix. 1978. http://bitsavers.org/pdf/tektronix/catalog/Tektronix_Catalog_1978.pdf. Retrieved April 17, 2012.
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