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Finally figured out S5 is a pull-up resistor.
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@ -446,7 +446,7 @@ module palcl(simclk, vcc, gnd, n_res, n_sysclk,
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wire c8mf, c16mf, c2m, u12f_tc, ram_r_n_w_f;
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wire vmsh; // video mid-shift, connect two register chips together
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wire s5; // Video shift register final output
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wire s5; // This is just a pull-up resistor
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// L12 => va13
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// L13 => va14
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@ -475,6 +475,8 @@ module palcl(simclk, vcc, gnd, n_res, n_sysclk,
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// TSG Output Enable is controlled by CAS on Macintosh Plus,
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// otherwise just go straight to ground on Macintosh 128k.
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assign tsg_oe3 = gnd;
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// S5: Pull-up resistor.
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assign s5 = vcc;
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/* N.B. The reason why phase calibration is required in the
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Macintosh 128k/512k/Plus is because the PALs do not have a RESET
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