{"id":9304,"date":"2024-09-03T12:13:11","date_gmt":"2024-09-03T10:13:11","guid":{"rendered":"https:\/\/retrofixer.it\/?p=9304"},"modified":"2024-09-03T12:15:52","modified_gmt":"2024-09-03T10:15:52","slug":"reset-per-commodore-64","status":"publish","type":"post","link":"https:\/\/retrofixer.it\/en\/reset-per-commodore-64\/","title":{"rendered":"Reset for Commodore 64"},"content":{"rendered":"
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Who could forget the legendary C64 and its countless games that brightened our days back then? If you remember, to load a new game you had to switch the computer off and on again: there was no button to restart without powering the machine down.<\/p>

In this article we look at three ways to add a reset button to the C64.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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USER PORT<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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\n\t\t\t\t\t\t\t\t\tLet’s see how to add a reset button to our computer’s user port.\n\nThis is the most commonly used solution if you want a button inside the computer, but be careful! You then have to drill the case, which I advise against: to preserve the machine it’s better to use an external connector, as we’ll see shortly.\n\nThe Commodore 64’s user port, seen from the back, is the one on the far right and is used to connect special peripherals such as modems or for I\/O communication; it usually isn’t used much. Still seen from the back, here is its pinout: the first pin is the top-left one, and the bottom row is labelled with letters.\n\nThis is its pinout, and as you can see the reset signal is on pin 3\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Pin<\/span><\/th>\nName<\/a><\/th>\nDescription<\/a><\/th>\n<\/tr>\n
1<\/td>\nGND<\/td>\nground<\/td>\n<\/tr>\n
2<\/td>\n+ 5V<\/td>\n+5 VDC (100 mA max)<\/td>\n<\/tr>\n
3<\/td>\n\/RESET<\/td>\nReset, will force a cold start. Also a reset output for devices.<\/td>\n<\/tr>\n
4<\/td>\nCNT1<\/td>\nCounter 1, from CIA #1<\/td>\n<\/tr>\n
5<\/td>\nSP1<\/td>\nSerial Port 1, from CIA #1<\/td>\n<\/tr>\n
6<\/td>\nCNT2<\/td>\nCounter 2, from CIA #2<\/td>\n<\/tr>\n
7<\/td>\nSP2<\/td>\nSerial port 2, from CIA #2<\/td>\n<\/tr>\n
8<\/td>\n\/PC2<\/td>\nHandshaking line, from CIA #2<\/td>\n<\/tr>\n
9<\/td>\nAT extension<\/td>\nSerial attention in<\/td>\n<\/tr>\n
10<\/td>\n9VAC<\/td>\n9 VAC (+ phase) (100 mA max)<\/td>\n<\/tr>\n
11<\/td>\n9VAC<\/td>\n9 VAC (- phase) (100 mA max)<\/td>\n<\/tr>\n
12<\/td>\nGND<\/td>\nground<\/td>\n<\/tr>\n
<\/td>\n<\/tr>\n
TO<\/td>\nGND<\/td>\nground<\/td>\n<\/tr>\n
b<\/td>\n\/FLAG2<\/td>\nFlags 2<\/td>\n<\/tr>\n
c<\/td>\nPB0<\/td>\nDate 0<\/td>\n<\/tr>\n
D.<\/td>\nPB1<\/td>\nDate 1<\/td>\n<\/tr>\n
And<\/td>\nPB2<\/td>\nDate 2<\/td>\n<\/tr>\n
F.<\/td>\nPB3<\/td>\nDate 3<\/td>\n<\/tr>\n
H.<\/td>\nPB4<\/td>\nDate 4<\/td>\n<\/tr>\n
j<\/td>\nPB5<\/td>\nDate 5<\/td>\n<\/tr>\n
k<\/td>\nPB6<\/td>\nDate 6<\/td>\n<\/tr>\n
L<\/td>\nPB7<\/td>\nDate 7<\/td>\n<\/tr>\n
m<\/td>\nPA2<\/td>\nPA2<\/td>\n<\/tr>\n
No<\/td>\nGND<\/td>\nground<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"C64\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"Userport\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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For an external connection you need a 24-pin (12+12) edge connector with a 3.96mm pitch<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Now all that’s left is to connect a button between pin 1 (GND) and pin 3 (RESET)
As I said, it can be done inside the computer, but to fit the button you either drill the case or come up with an innovative solution, perhaps with the help of a 3D printer.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\"internal\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\"ext\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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SERIAL PORT<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Another way to reset the C64 is via the IEC port used by the disk drive or printer.
If we connect a 1541 drive or a printer, it will have a second DIN connector for daisy-chaining other peripherals, and the reset can be added to these ports too.
If you’re using a serial peripheral that has no reset button or pass-through connector, this solution can’t be used.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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The pinout of the serial port is as follows.<\/p>
Pin<\/a><\/th>Description<\/a><\/th>Signal direction<\/a><\/th>Remark<\/a><\/th><\/tr>
1<\/td>SERIAL SRQ<\/td>IN<\/td>Serial Service Request In, at the\u00a0C128<\/a>\u00a0“Fast Serial Clock”<\/td><\/tr>
2<\/td>GND<\/td>–<\/td>Ground, signal ground (0V)<\/td><\/tr>
3<\/td>SERIAL ATN<\/td>OUT<\/td>Attention, for the selection of a device at beginning\/end of a transmission<\/td><\/tr>
4<\/td>SERIAL CLK<\/td>IN\/OUT<\/td>Clock (for data transmission)<\/td><\/tr>
5<\/td>SERIAL DATA<\/td>IN\/OUT<\/td>Date<\/td><\/tr>
6<\/td>SERIAL RESET<\/td>OUT(\/IN)<\/td>Reset, in older\u00a0VIC-20<\/a>\u00a0unused<\/td><\/tr><\/tbody><\/table>

The reset signal is on pin 6 (centre) and GND is on pin 2 (bottom right)<\/p>

At this point we can use the 6-pin DIN connector itself as the housing for the button. I’ve noticed that some people add a resistor to pull the reset signal to ground rather than giving it a hard connection. I tried with a 180 Ohm resistor and there are no problems. So if you don’t feel confident, or are worried that some signal might accidentally touch a pin, you can put a resistor in series with the button to limit the current.<\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"serial\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"140px\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"SerialBus\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"serial\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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EXPANSION PORT<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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And here we are at the last solution, via the expansion port, the one used for cartridges, to be clear.
These numerous pins also carry the reset signal, and diagnostic cartridges, crackers or fastloaders often have a button for resetting the machine.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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\n\t\t\t\t\t\t\t\t\tBelow is the pinout of the expansion port.\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Pin<\/a><\/th>\nsignal<\/a><\/th>\nDirection (From C64)<\/a><\/th>\nMeaning<\/a><\/th>\nRemark<\/a><\/th>\n<\/tr>\n
1<\/td>\nGND<\/td>\nPWR extension<\/td>\nground<\/td>\nPotential is 0V on ground, signal levels are measured relative this, can also be called “common ground”.<\/td>\n<\/tr>\n
2<\/td>\n+5V DC<\/td>\nPWR extension<\/td>\n\n

Supply voltage +5V DC<\/p>\n<\/td>\n

\n

The maximum load for extensions is 450mA.<\/p>\n<\/td>\n<\/tr>\n

3<\/td>\n<\/td>\n<\/tr>\n
4<\/td>\n_IRQ<\/td>\nIn\/Out<\/td>\nInterruptRequest<\/td>\nsee\u00a0IRQ<\/a>\u00a0. As an output, reflects the status of the IRQ line<\/td>\n<\/tr>\n
5<\/td>\nR\/_W<\/td>\nIn\/Out<\/td>\nRead or _Write signal<\/td>\nHigh-level during read cycle, Low-level during write cycle<\/td>\n<\/tr>\n
6<\/td>\nDOT Clk<\/td>\nOut<\/td>\nDot clock frequency<\/td>\n7.881984 MHz for\u00a0PAL<\/a>-systems\u00a0; 8.181816 MHz for\u00a0NTSC<\/a>-systems<\/td>\n<\/tr>\n
7<\/td>\n_IO1<\/td>\nOut<\/td>\nInput\/Output area 1 indicator<\/td>\nSignal is low if address bus is within $DE00-$DEFF.<\/td>\n<\/tr>\n
8<\/td>\n_GAME<\/td>\nIn<\/td>\nGame configuration<\/td>\nUsed for memory re-configuration<\/td>\n<\/tr>\n
9<\/td>\n_EXROM<\/td>\nIn<\/td>\nExternal\u00a0ROM<\/a><\/td>\nSimilar to _GAME. During low the internal\u00a0RAM<\/a>\u00a0in the range of $8000-$9FFF will be switched off and _ROML will be set low, if one of these addresses occur.<\/td>\n<\/tr>\n
10<\/td>\n_IO2<\/td>\nOut<\/td>\nInput\/Output area 2 indicators<\/td>\nSignal is low if address bus is within $DF00-$DFFF.<\/td>\n<\/tr>\n
11<\/td>\n_ROML<\/td>\nOut<\/td>\nROM Low<\/td>\nLow signal if the address range is $8000-$9FFF is switched off with _EXROM and one of these addresses occur on the bus.<\/td>\n<\/tr>\n
12<\/td>\nB.A<\/td>\nOut<\/td>\nBus Available<\/td>\nSignal from the\u00a0video controller<\/a>, which indicates if the bus is available during high phase of PHI2. BA=0 means\u00a0VIC<\/a>\u00a0needs the bus during both phases of PHI2 and no other unit can use it.<\/td>\n<\/tr>\n
13<\/td>\n_DMA<\/td>\nIn<\/td>\nDirect Memory Access<\/td>\nif _DMA=Low the\u00a0CPU<\/a>\u00a0can be requested to release the bus. It will stop after the next read cycle and all bus lines will go to high resistance state. So other units can use the computer hardware. At _DMA=High the\u00a0CPU<\/a>\u00a0continues to work.<\/td>\n<\/tr>\n
14<\/td>\nQ7<\/td>\nIn\/Out<\/td>\nData lines 7<\/td>\nBit 7 of data bus, value=128<\/td>\n<\/tr>\n
15<\/td>\nQ6<\/td>\nIn\/Out<\/td>\nData lines 6<\/td>\nBit 6 of data bus, value=64<\/td>\n<\/tr>\n
16<\/td>\nQ5<\/td>\nIn\/Out<\/td>\nData lines 5<\/td>\nBit 5 of data bus, value=32<\/td>\n<\/tr>\n
17<\/td>\nQ4<\/td>\nIn\/Out<\/td>\nDatalines 4<\/td>\nBit 4 of data bus, value=16<\/td>\n<\/tr>\n
18<\/td>\nQ3<\/td>\nIn\/Out<\/td>\nData lines 3<\/td>\nBit 3 of data bus, value=8<\/td>\n<\/tr>\n
19<\/td>\nQ2<\/td>\nIn\/Out<\/td>\nData lines 2<\/td>\nBit 2 of data bus, value=4<\/td>\n<\/tr>\n
20<\/td>\nQ1<\/td>\nIn\/Out<\/td>\nData line 1<\/td>\nBit 1 of data bus, value=2<\/td>\n<\/tr>\n
21<\/td>\nD0<\/td>\nIn\/Out<\/td>\nDataline 0<\/td>\nBit 0 of data bus, value=1<\/td>\n<\/tr>\n
22<\/td>\nGND<\/td>\nPWR extension<\/td>\n\n

ground<\/p>\n<\/td>\n

(See above)<\/td>\n<\/tr>\n
TO<\/td>\n<\/tr>\n
b<\/td>\n_ROMH<\/td>\nOut<\/td>\nROM High<\/td>\nDepending on the status of _GAME and _EXROM this line gets low during access to the address space between $A000-$BFFF respectively $E000-$FFFF. Condition: the internal ram area is faded out.<\/td>\n<\/tr>\n
c<\/td>\n_RESET<\/td>\nIn<\/td>\nReset<\/td>\nIf this line is pulled to low, all chips will be re-initialized. The\u00a0program counter<\/a>\u00a0of the\u00a0CPU<\/a>\u00a0will be loaded with the\u00a0reset<\/a>\u00a0vector $FFFC and $FFFD (normally $FCE2).<\/td>\n<\/tr>\n
D.<\/td>\n_NMI<\/td>\nIn<\/td>\nNon-maskable interrupts<\/td>\nsee\u00a0NMI<\/a><\/td>\n<\/tr>\n
And<\/td>\nPHI2<\/td>\nOut<\/td>\nPhase 2 clock<\/td>\nSystem clock (0.98524861 MHz for PAL, 1.02272714 MHz for NTSC)<\/td>\n<\/tr>\n
F.<\/td>\nA15<\/td>\nIn\/Out<\/td>\nAddress line 15<\/td>\nBit 15 of address bus value=32768<\/td>\n<\/tr>\n
H.<\/td>\nA14<\/td>\nIn\/Out<\/td>\nAddress line 14<\/td>\nBit 14 of address bus value=16384<\/td>\n<\/tr>\n
j<\/td>\nA13<\/td>\nIn\/Out<\/td>\nAddress line 13<\/td>\nBit 13 of address bus value=8192<\/td>\n<\/tr>\n
k<\/td>\nA12<\/td>\nIn\/Out<\/td>\nAddress line 12<\/td>\nBit 12 of address bus value=4096<\/td>\n<\/tr>\n
L<\/td>\nA11<\/td>\nIn\/Out<\/td>\nAddress line 11<\/td>\nBit 11 of address bus value=2048<\/td>\n<\/tr>\n
m<\/td>\nA10<\/td>\nIn\/Out<\/td>\nAddress line 10<\/td>\nBit 10 of address bus value=1024<\/td>\n<\/tr>\n
No<\/td>\nA9<\/td>\nIn\/Out<\/td>\nAddress line 9<\/td>\nBit 9 of address bus value=512<\/td>\n<\/tr>\n
P.<\/td>\nA8<\/td>\nIn\/Out<\/td>\nAddress line 8<\/td>\nBit 8 of address bus value=256<\/td>\n<\/tr>\n
R<\/td>\nA7<\/td>\nIn\/Out<\/td>\nAddress line 7<\/td>\nBit 7 of address bus value=128<\/td>\n<\/tr>\n
S.<\/td>\nA6<\/td>\nIn\/Out<\/td>\nAddress line 6<\/td>\nBit 6 of address bus value=64<\/td>\n<\/tr>\n
T<\/td>\nA5<\/td>\nIn\/Out<\/td>\nAddress line 5<\/td>\nBit 5 of address bus value=32<\/td>\n<\/tr>\n
u<\/td>\nA4<\/td>\nIn\/Out<\/td>\nAddress line 4<\/td>\nBit 4 of address bus value=16<\/td>\n<\/tr>\n
v<\/td>\nA3<\/td>\nIn\/Out<\/td>\nAddress line 3<\/td>\nBit 3 of address bus value=8<\/td>\n<\/tr>\n
w<\/td>\nA2<\/td>\nIn\/Out<\/td>\nAddress line 2<\/td>\nBit 2 of address bus value=4<\/td>\n<\/tr>\n
x<\/td>\nA1<\/td>\nIn\/Out<\/td>\nAddress line 1<\/td>\nBit 1 of address bus value=2<\/td>\n<\/tr>\n
Y<\/td>\nA0<\/td>\nIn\/Out<\/td>\nAddress line 0<\/td>\nBit 0 of address bus value=1<\/td>\n<\/tr>\n
Z<\/td>\nGND<\/td>\nPWR extension<\/td>\nground<\/td>\n(See above)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"C64\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"Expansionsport\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"cart\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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With the connector seen from the back, we can identify pin C (RESET) and pin A (GND) as the first and third of the bottom row on the right.
Connecting a button between these two pins gives us the usual computer reset.<\/p>

Unfortunately this connector is female and you need to make a PCB to connect to it without problems. In this case we either make it ourselves the old-fashioned way (pen or photo-etching print and etching), buy a ready-made one, or have it made by our trusted PCB manufacturers. If you like, you can use a PCB from cartridges such as the Magic Desk or similar ones that have a reset button: just solder on the button alone, without the other components, and job done.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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<\/div>\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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*Images and tables taken from<\/span> Wikipedia<\/a><\/h6>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"

Come poter resettare il C64, vediamo 3 soluzioni.<\/p>","protected":false},"author":1,"featured_media":9331,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5,19,352],"tags":[145],"class_list":["post-9304","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-commodore","category-computer","category-periferiche","tag-commodore-64"],"_links":{"self":[{"href":"https:\/\/retrofixer.it\/en\/wp-json\/wp\/v2\/posts\/9304","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/retrofixer.it\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/retrofixer.it\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/retrofixer.it\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/retrofixer.it\/en\/wp-json\/wp\/v2\/comments?post=9304"}],"version-history":[{"count":14,"href":"https:\/\/retrofixer.it\/en\/wp-json\/wp\/v2\/posts\/9304\/revisions"}],"predecessor-version":[{"id":9330,"href":"https:\/\/retrofixer.it\/en\/wp-json\/wp\/v2\/posts\/9304\/revisions\/9330"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/retrofixer.it\/en\/wp-json\/wp\/v2\/media\/9331"}],"wp:attachment":[{"href":"https:\/\/retrofixer.it\/en\/wp-json\/wp\/v2\/media?parent=9304"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/retrofixer.it\/en\/wp-json\/wp\/v2\/categories?post=9304"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/retrofixer.it\/en\/wp-json\/wp\/v2\/tags?post=9304"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}